Answers
Meiosis is important for the continuity of life because it allows cells to divide and create new cells with half the number of chromosomes as the parent cell. This process ensures genetic diversity and the ability of organisms to adapt to changing environments over time.
Related Questions
list below the communities found during primary succession starting with pioneer species and ending at climax community
Answers
Explanation:
Image result for list below the communities found during primary succession starting with pioneer species and ending at climax community
The labels I-VII represent the different stages of primary succession. I-bare rocks, II-pioneers (mosses, lichen, algae, fungi), III-annual herbaceous plants, IV-perennial herbaceous plants and grasses, V-shrubs, VI-shade intolerant trees, VII-shade tolerant trees.
Which of the following is NOT a benefit of owning pets?
Responses
fighting depression
reducing risk of heart disease
lowering blood pressure
preventing allergic reactions
Answers
Preventing allergic reactions is NOT a benefit of owning pets.
What are pets?Pets are domesticated animals that are kept primarily for companionship, entertainment, or emotional support. Common pets include dogs, cats, birds, fish, rodents (such as hamsters and guinea pigs), reptiles, and even some insects.
People keep pets for various reasons, such as to provide emotional support, to teach children responsibility, or simply for the enjoyment of having a companion animal around. Pets can become part of a family and are often treated with love and care, much like human family members.
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Answer: The correct answer is preventing allergic reactions
Explanation: This answer has been confirmed correct.
People do not own pets in order to prevent allergies, in fact, many species can aggravate certain allergies.
The parents, Michael and Danielle, both have light brown skin and the Bb genotype. Draw a Punnett square and explain how these parents could have two babies with different color skin- one dark brown and the other tan.
Answers
Answer:
n order to create a Punnett square, we need to list the possible gametes (sex cells) that each parent can contribute to their offspring. Since Michael and Danielle both have the Bb genotype, they can each contribute a B or a b allele to their offspring.
Possible gametes for Michael: B or b
Possible gametes for Danielle: B or b
Using these gametes, we can create a Punnett square to show the possible genotypes of their offspring:
B b
B BB Bb
b Bb bb
From the Punnett square, we can see that there are four possible combinations of alleles for their offspring: BB, Bb, Bb, and bb.
BB: This offspring would have two dominant B alleles, resulting in dark brown skin.
Bb: This offspring would have one dominant B allele and one recessive b allele, resulting in tan skin.
Bb: This offspring would have one dominant B allele and one recessive b allele, resulting in tan skin.
bb: This offspring would have two recessive b alleles, resulting in light skin.
Therefore, it is possible for Michael and Danielle to have two babies with different skin colors, one with dark brown skin and the other with tan skin, due to the combination of their different alleles in their offspring.
Insulin:
Decreases glycogen uptake by cells
Increases in concentration in the blood after a meal
Promotes water reabsorption
Is released in response to the onset of exercise
Answers
Explanation:
In the liver, insulin affects glycogen metabolism by stimulation of glycogen synthesis. Protein phosphatase I (PPI) is the key molecule in the regulation of glycogen metabolism. Via dephosphorylation, PPI slows the rate of glycogenolysis by inactivating phosphorylase kinase and phosphorylase A.
Emily and Vicky are discussing coal as an energy source. Emily claims coal is a renewable energy source. Vicky disagrees.
Who is right, and why?
Responses
Vicky; it is possible to replenish coal in the short term. Vicky; it is possible to replenish coal in the short term.
Emily; coal burns cleanly, producing only carbon dioxide and water. Emily; coal burns cleanly, producing only carbon dioxide and water.
Vicky; coal is a fossil fuel and supplies on Earth are limited. Vicky; coal is a fossil fuel and supplies on Earth are limited.
Emily; renewable resources are always gases or liquids.
brainliest for whoever does it right
Answers
Answer:
Vicky is right that coal is not a renewable energy source since it is a fossil fuel with limited supplies on Earth. Coal combustion also produces harmful air pollutants. Emily is incorrect in stating that renewable resources are always gases or liquids.
Which of the following occurs when population exceeds its carrying capacity? O Nothing happens O Overpopulation O More Resources O Less competition
Answers
Answer:
B) Overpopulation.
Explanation:
When population exceeds its carrying capacity, the result is overpopulation. Therefore, the answer to your question is "Overpopulation". This concept is mentioned in result #9, which states that limiting factors determine an ecosystem's carrying capacity , which is the maximum population size the environment can support given all available resources . When the population size exceeds this limit, resources become scarce, and the environment is unable to sustain the population, leading to overpopulation.
Answer:
The Effects of Overpopulation, More people means an increased demand for food, water, housing, energy, healthcare, transportation, and more. And all that consumption contributes to ecological degradation, increased conflicts, and a higher risk of large-scale disasters like pandemics
So I would say B is the answer
Do a research proposal on this topic "Perceptions and attitudes towards consumption of GMO tomatoes" (Desk review)
Answers
Answer:
Explanation:
Title: Perceptions and Attitudes towards Consumption of GMO Tomatoes: A Desk Review
Background:
Genetically Modified Organisms (GMOs) are plants or animals that have been genetically engineered to possess desirable traits, such as increased resistance to pests, herbicides, or harsh weather conditions. Despite the potential benefits of GMOs, there are concerns about the safety and long-term effects of consuming them. Tomatoes are one of the most commonly genetically modified crops, and it is important to understand consumer perceptions and attitudes towards them.
Objectives:
The objectives of this desk review are to:
1. Explore existing literature on consumer perceptions and attitudes towards consumption of GMO tomatoes.
2. Identify the factors that influence consumer acceptance or rejection of GMO tomatoes.
3. Assess the knowledge, beliefs, and values that shape consumer attitudes towards GMO tomatoes.
4. Identify gaps in the literature and suggest areas for further research.
Methods:
This desk review will involve a comprehensive search of electronic databases, including PubMed, Web of Science, and Scopus. The search will include keywords such as "genetically modified tomatoes," "consumer attitudes," "perceptions," and "food safety." The inclusion criteria will be studies published in English between 2010 and 2022 that focus on consumer perceptions and attitudes towards consumption of GMO tomatoes.
Results:
The results of this desk review will provide an overview of the existing literature on consumer perceptions and attitudes towards consumption of GMO tomatoes. It will identify the factors that influence consumer acceptance or rejection of GMO tomatoes, such as concerns about health and safety, ethical and environmental considerations, and trust in regulatory bodies. The review will also assess the knowledge, beliefs, and values that shape consumer attitudes towards GMO tomatoes, such as familiarity with GMO technology and perceptions of naturalness.
Conclusion:
The findings of this desk review will provide valuable insights into consumer perceptions and attitudes towards consumption of GMO tomatoes. The results will help to identify areas where further research is needed and may inform policy decisions related to the labeling and regulation of GMO foods. Ultimately, this review will contribute to a better understanding of the factors that shape consumer attitudes towards GMOs and their implications for food production, distribution, and consumption.
Fruit flies have sensory receptors that respond to different chemicals. Some of these receptors are sensitive to chemicals that make up odors while others are sensitive to chemicals that make up tastes. For example, one type of taste receptor in fruit flies is sensitive to the taste of water. Scientists performed an experiment to examine the role of odor and taste receptors in guiding the behavior of fruit flies.
The scientists' experiment took place in two phases. In the training phase, the scientists kept the fruit flies away from water for 16 hours. Then, they placed the fruit flies in a chamber filled with a specific odor (odor 1) but no water for 2 minutes. They next transferred the flies to a second chamber filled with a different odor (odor 2) and water for 2 minutes.
In the next phase, the scientists tested the fruit flies by placing them in a testing maze with two arms, one of which contained odor 1 and the second which contained odor 2. Neither of these arms contained water. The scientists counted the number of flies that went into each arm. The testing phase was completed after different amounts of time had passed after the training phase. The scientists then repeated this experiment with flies that lacked the taste receptor for water. The table below shows the number of flies that went into each arm in all of the trials.
Time After Training Normal Flies Flies That Cannot Taste Water
Odor 1 Odor 2 Odor 1 Odor 2
3 minutes 36 64 55 45
3 hours 33 67 45 55
24 hours 30 70 51 49
Data adapted from Shyu et al. 2017. Nature Communications. Licensed under CC BY 4.0.
How do the scientists' findings support the argument that the information fruit flies take in through their sensory receptors can be stored as memories?
A.
by showing that fruit flies that could taste water were more attracted to odor 2 during the training period than were fruit flies that could not taste water
B.
by showing that fruit flies that could not taste water were not attracted to odor 2 by 24 hours after training
C.
by showing that more of the fruit flies that could taste water were attracted to odor 2 than odor 1 at 24 hours after training
D.
by showing that fruit flies that could not taste water were less likely to locate water in the maze than fruit flies that could taste water
Answers
The normal fruit flies were able to use their sensory receptors to store and retrieve memories of past experiences, indicating that sensory information can be stored as memories in fruit flies.
The correct option is C.
What is the result of the experiment with fruit flies?The scientists' findings support the argument that the information fruit flies take in through their sensory receptors can be stored as memories because the data shows a difference in behavior between the normal fruit flies and the flies that cannot taste water.
Specifically, the normal fruit flies were more attracted to odor 2, which was associated with water during the training phase, than odor 1 at 24 hours after training. In contrast, the flies that could not taste water did not show a preference for either odor at 24 hours after training.
This suggests that the normal fruit flies formed a memory of the association between odor 2 and water during the training phase and were able to use that memory to guide their behavior in the testing maze.
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. Which of the organisms—herbivores, carnivores, or omnivores—would also be labeled consumers? Why?
Answers
In an ecosystem, all herbivores, carnivores, and omnivores are regarded as consumers. This is due to the fact that they consume other species, whether they be plants, animals, or both, in order to gain energy and nutrients.
Every organism that consumes other living things is referred to as a consumer in ecological terms. Since they devour plants, which are producers that harness solar energy through photosynthesis, herbivores are consumers. Since they devour other animals, which are themselves, consumers who have acquired energy and nutrients from other species, carnivores are consumers. Since omnivores consume both plants and animals, they are consumers who fill a variety of ecological niches.
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What is chlorophyll.
Answers
Answer:
Chlorophyll is responsible for the green color of many plants and algae. Seen through a microscope, chlorophyll is concentrated within organisms in structures called chloroplasts
Explanation:
Answer:
It is a green pigment found in almost all plants. It participates in photosynthesis by absorbing light
What if Fallin’s record label asked her to pose in the war bonnet to gain publicity for her music?
Would it make a difference if this were simply a business decision to sell records? Explain your reasoning
Answers
If a restriction enzyme has a cleavage site consisting of six nucleotide pairs, what is the chance that six adjacent nucleotides in a random sequence of double-stranded DNA will match the restriction site?
Question 2 options:
a) (1/4)4 = 1/256
b) (1/2)6 = 1/64
c) (1/2)4 = 1/16
d) (1/4)6 = 1/4096
Answers
Answer:
The chance of each nucleotide base (A, T, C, or G) occurring in a random sequence is 1/4. Since there are six nucleotide pairs in the restriction site, the probability of each pair matching is (1/4)2 = 1/16. Therefore, the probability of all six adjacent nucleotide pairs matching the restriction site is (1/16)6 = 1/16777216, which is approximately 1 in 16 million.
However, none of the given answer options is correct. The closest answer is d) (1/4)6 = 1/4096, which is the probability of a randomly selected sequence of six nucleotide pairs matching a specific sequence of six pairs. But the restriction site can match in any order, so we need to consider all the possible combinations of six adjacent pairs in the DNA sequence.
There are (2n-6+1) possible locations for a six-nucleotide pair sequence in a double-stranded DNA molecule of length n. For n = 6, there is only one possible location, but for larger values of n, there are more possibilities. For example, in a molecule of length 10, there are five possible locations:
ATGCAGTACC
TGCAGTA
CAGTAC
GTACC
TACCA
So the probability of at least one of these locations matching the restriction site is 1 - (1 - 1/4096)5 = 0.00122, which is approximately 1 in 820.
Therefore, the correct answer is not listed among the given options.
If all of the prairie dogs were removed, how do you think the prairie ecosystem would be affected?
Answers
The structure and operation of the grassland ecosystem would be significantly impacted if all prairie dogs were eliminated.
As prairie dogs are a keystone species, their influence on the environment is disproportionately great compared to how common they are. The following are some possible outcomes of their removal:
Lack of burrowing activity: Prairie dogs are noted for their considerable burrowing, which digs out intricate subterranean tunnels that serve as homes for a variety of other animals, including burrowing owls, snakes, and insects.A diversified plant ecosystem may be maintained by prairie dogs, who graze on a range of grasses and other plants.Prairie dogs dig huge networks of burrows that aerate the soil and improve water penetration in order to combat soil compaction and erosion.Changes in predator populations: Several predators, including coyotes, foxes, and raptors, depend on prairie dogs as a source of food.learn more about prairie dogs,
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How does a fever disrupt homeostasis? Use the terms stimulus, control center, set point, receptors, effectors, and imbalance in your answer. Please underline or highlight these words in your response.
Answers
Homeostasis Infected bacteria and viruses that are adapted to replicate at your normal homeostatic body temperature range may be hindered by the elevated temperature.
As a result, your immune cells may have a chance to eliminate the bacteria before they spread and reproduce quickly inside the body. The Our body's temperature is recorded by the hypothalamus, which compares it to the ambient temperature of about 37 degrees Celsius. If our body temperature drops too low, the hypothalamus makes sure that the body generates and maintains heat.
Homeostasis with variable set points can be seen in many different situations. Fever, in which the set point for core body temperature increases and is sustained at a higher level, is one of the most noticeable
Your sweat glands are signalled to produce perspiration in order to cool you off when your hypothalamus determines that you are too hot.When the hypothalamus senses that you are too cold, it sends signals to your muscles that drive you to shiver and produce heat. We refer to this as preserving equilibrium.
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What would happen if ligase were absent?
Answers
DNA ligase is involved in DNA repair, DNA replication. They are also involved in crossover in meiosis in eukaryotes and in recombination processes in mammals that ensure the diversity of the immune system. DNA ligase enzyme is used in recombinant DNA applications in molecular biology laboratories..good luck...
How could a garden store owner determine what light conditions are needed for a particular flowering plant to bloom?
Answers
Even though a plant may be able to endure low light levels for growing, more light may be needed to encourage thick foliage and flowering.
A garden shop owner could ascertain the quantity and quality of natural light in their area to ascertain the lighting requirements for a specific flowering plant to bloom.
After that, users can select plants whose lighting needs match those of their indoor environment.
How does photosynthesis work?
Green plants and certain other species use photosynthesis, a process that uses sunlight and chlorophyll to create food.
Describe chlorophyll.
The majority of plants, algae, and cyanobacteria have the green pigment called chlorophyll. It is crucial to the process of photosynthesis, which is how plants turn light energy into chemical energy.
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What wind systems move air from about 30 degrees north or south latitude toward the equator?
Answers
The trade winds are warm, consistent winds that are created when air moves back towards the equator. In honour of the English meteorologist who initially hypothesised their existence for explain the trade winds.
What kind of wind patterns are present as one moves from latitude 30 towards the equator?Most of the cooling sinking air flows back to the equator between 30 ° latitude and the equator. The remaining air is directed towards the poles. What do trade winds consist of? In the direction of the equator, the winds are air currents.
Why does the equator and 30 degrees northern latitude have nearly no wind?Its weight is increased and an area with high pressure is created at the poles thanks to air flowing in from higher altitudes of the atmosphere on top of it. It takes time for air to get from the equator to the poles. There is an accumulation of air due to the earth's rotatio.
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Question 20 of 25
Which shows a monosaccharide?
( А.
B.
H2C-0
1.
HC-O'
D.
насточтового
ННННН
||||т
С. Н-с-с-с-с-с-н
||||т
ННННН
CH₂OH
ОН
ОН
-О ОН
ОН
12
15
Answers
The structural layers of Earth (lithosphere, asthenosphere, etc.) are determined by which of the following?
Question
A. What they look like
B. What they sound like
C. Their physical properties
D. When they were discovered
Answers
Answer:
C. Their physical properties
Explanation:
layers:
(inside the earth)
Inner Core solid iron nickel hot 5,200°C.
Outer Core liquid layer iron nickel hot 5,000°C.
D''' Layer 2 layers, inside mantle, weird seismic waves.
Lower Mantle silicon, oxygen, magnesium iron 3700°C.
Upper Mantle silicon, oxygen, magnesium, and iron 2,200°C.
Mohorovičić Discontinuity (Moho) crust & mantle meet, and it has a sudden change in how seismic waves travel due to the difference in the density and composition of the crust and the mantle.
Crust outside layer thinnest &coolest lighter elements oxygen, silicon, and aluminum 400°C.
(outside the earth)
Which statement describes the role of a mitochondrion in providing a body with energy?
Group of answer choices
It is the site where oxygen combines with small molecules and releases large amounts of energy.
It combines blood and oxygen so that energy can be released from glucose.
It stores glucose that is taken from food so that respiration can happen later.
It is the site where food is broken down into small molecules and amounts of energy.
Answers
A mitochondrion's function in supplying a body with energy is to be the location where food is broken down into small molecules.
What part does a mitochondrion play in supplying an organism with energy?Oxidative phosphorylation, which produces ATP using the energy released during the oxidation of the food we consume, is the traditional function of mitochondria.
What purpose does the mitochondrion serve in producing ATP as a source of energy?The majority of the chemical energy required to drive a cell's biochemical processes is produced by mitochondria, which are membrane-bound cell organelles (mitochondrion, singular). Adenosine triphosphate, a tiny molecule, serves as a storage container for the chemical energy generated by the mitochondria. (ATP).
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Negative feedback is most like _____.
Answers
Answer: which analogy in your home or likely to cause disease
Explanation:
what are impact of micro organisms for human being
Answers
Answer:
Microbes cause infectious diseases such as flu and measles.
Explanation:
Microbes cause infectious diseases such as flu and measles. There is also strong evidence that microbes may contribute to many non–infectious chronic diseases such as some forms of cancer and coronary heart disease. Different diseases are caused by different types of micro-organisms.
How can one calculate the product loss during the production of salami without using prices?
Answers
Therefore, by calculating the yield percentage, one can determine the amount of product loss during the production of salami without using prices.
How is salami calculated?The product loss during the production of salami can be calculated without using prices by using the concept of yield percentage. Yield percentage is the ratio of the weight of the final product to the weight of the raw material used in production, expressed as a percentage.
To calculate the yield percentage, one needs to know the weight of the raw material used and the weight of the final product. The difference between the two weights represents the product loss.
The yield percentage can be calculated using the following formula:
Yield percentage = (Weight of final product / Weight of raw material) x 100
For example, if 100 kg of raw material is used to produce 85 kg of salami, the yield percentage would be:
Yield percentage = (85 kg / 100 kg) x 100
Yield percentage = 85%
This means that 15% of the raw material was lost during the production process. The weight of the product loss can also be calculated by subtracting the weight of the final product from the weight of the raw material:
Product loss = Weight of raw material - Weight of final product
Using the same example, the product loss would be:
Product loss = 100 kg - 85 kg
Product loss = 15 kg
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8. Metamorphic rocks are created through a change in the rock's original structure.
A. What are three types of change that occur in the process of metamorphism? (3 points)
B. What happens to the rock structure during each of type of change? (6 points)
Answers
Answer:
A. Three types of changes that occur in the process of metamorphism are: 1. Pressure: When rocks are subjected to high pressure, they can change form without melting. This is called pressure metamorphism. 2. Temperature: If rocks are heated to high temperatures, they can change form without melting. This is called thermal metamorphism. 3. Chemical changes: Rocks can undergo chemical changes due to the introduction of fluids. This is called hydrothermal metamorphism. B. During pressure metamorphism, the rock structure changes due to the pressure, causing minerals to reorient themselves and form new minerals. During thermal metamorphism, the rock structure changes due to the heat, causing minerals to recrystallize and form new minerals. During hydrothermal metamorphism, the rock structure changes due to the introduction of fluids, which can cause new minerals to form and old minerals to dissolve.
DNA renaturation (hybridization) can be used to:
Question 8 options:
a) None of the other answer options is correct.
b) cleave long fragments of DNA into smaller fragments for analysis.
c) determine the degree of similarity between two DNA samples.
d) amplify small samples of DNA by replicating them.
e) determine the nucleotide sequence of a DNA strand.
Answers
Answer:
The answer is C
Explanation:
Ace This :)
Question 10 (1 point)
Jasmeen watches lots of telenovelas. She admires the way the women in the shows look, but it bothers her that none of these women look like her. Jasmeen feels fat, and when a woman character in her favorite shows is supposed to fat, to Jasmeen she looks only slightly less skinny than the other actresses. Jasmeen has complained to her brother Amal about this. What is the BEST comment Amal could make to Jasmeen about her telenovelas?
Question 10 options:
"All those shows are ridiculous, and you should stop watching them."
"In the real world, plenty of women look like you and are happy."
"The women in those shows look that way to be admired by men."
"If you want to look like those women, you'd better make some changes."
Question 11 (1 point)
When alcohol's toxic effects prevent your body from producing an important chemical called adenosine triphosphate (ATP). What might this interfere with?
Question 11 options:
heart function
muscle development
respiration
stimulation
Question 12 (1 point)
What is the BEST way to release dopamine?
Question 12 options:
drinking alcohol
taking stimulant drugs
eating processed food
getting exercise
Question 13 (1 point)
At which age do children begin to compare themselves to others, focusing on clothing and hair?
Question 13 options:
two years old
four years old
five years old
six years old
Question 14 (1 point)
Emily is shorter than many of the other girls her age. This never bothered her before, but now it's something she notices often. What MOST likely is Emily's educational level?
Question 14 options:
kindergarten
elementary school
high school
college or university
Question 15 (1 point)
Many harmful drugs release dopamine, which can cause them to become:
Question 15 options:
addictive.
unpleasant.
depressants.
safe.
ANSWER FAST PLEASE!!!
Answers
(Just a tip: If you want people to answer quicker, consider raising the amount of points you spend.)
What is the BEST comment Amal could make to Jasmeen about her telenovelas?B. In the real world, plenty of women look like you and are happy.
What might this interfere with?C. respiration
What is the BEST way to release dopamine?D. getting exercise
At which age do children begin to compare themselves to others, focusing on clothing and hair?B. four years old
What MOST likely is Emily's educational level?B. elementary school
Many harmful drugs release dopamine, which can cause them to become:A. addictive
Mutations may affect single base pairs or large portions of genetic code - even entire genes or chromosomes
Answers
It is accurate. Single base pair changes to variations in the entire chromosome are examples of the several levels at which mutations can take place. A mutation may potentially produce a variety of outcomes.
What mutation changes just one DNA base pair?A point mutation occurs when one base pair is added, subtracted, or changed in a genome. While the majority of point mutations are innocuous, they can also have a number of functional impacts, such as alterations to proteins that are encoded or variations to how genes are expressed.
How are genetic changes impacted by mutations?Sometimes, one or more proteins cannot function properly due to gene changes, also known as mutations. By changing the gene's instructions for creating a protein, a variant can cause it to malfunction or not be produced at all.
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Oligosaccharides are:
a. Classified as a chain of three-twenty carbons and are responsible for signaling.
b. None of the above.
Oc. Classified into either five or six carbon rings, usually responsible for the structure.
d. Classified as a chain of twenty-one carbon chains to several hundreds carbon long chains, usually used for
structure or storage.
Answers
Oligosaccharides are none of the above which is option B.
Oligosaccharides explained.Oligosaccharides are carbohydrates that consist of a short chain of simple sugar molecules (monosaccharides) linked together by chemical bonds called glycosidic linkages. They are typically composed of 3 to 10 monosaccharide units, and are sometimes referred to as "oligos" for short.
Oligosaccharides are found in a wide range of natural sources, including plants, animals, and microorganisms. They play important roles in many biological processes, such as cell-cell recognition, signaling, and as a source of energy.
Oligosaccharides are a type of carbohydrate that consists of a relatively small number of monosaccharide units (usually 3-10). They can be classified based on the type of monosaccharide units they contain, and the way in which these units are linked together. Oligosaccharides are important in many biological processes, including cell-cell recognition, signaling, and as a source of energy.
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Describe what is meant by the selective permeability of the plasma membrane. Why can't larger polar molecules and ions freely cross a lipid bilayer? (Consider the chemistry of the phospholipids as well as the physical barrier).
Answers
Answer:
The plasma membrane is a selectively permeable barrier that separates the cell from its environment. This means that while some substances can pass through the membrane freely, others cannot. The selective permeability of the plasma membrane is due to its structure, which is composed of a lipid bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.
The hydrophilic heads of the phospholipids are attracted to water, while the hydrophobic tails repel it. This creates a barrier that is impermeable to water-soluble substances, such as ions and polar molecules. Additionally, the phospholipid bilayer is relatively impermeable to larger nonpolar molecules, such as proteins and carbohydrates.
Small nonpolar molecules, such as oxygen and carbon dioxide, can diffuse easily across the plasma membrane due to their ability to dissolve in the hydrophobic interior of the lipid bilayer. However, larger polar molecules, such as glucose and amino acids, cannot pass freely through the membrane.
One reason for this is that the polar molecules are attracted to water, which is repelled by the hydrophobic tails of the phospholipids. This makes it difficult for the polar molecules to cross the lipid bilayer without assistance from specialized transport proteins, such as channels and carriers.
Furthermore, ions have an electrical charge that makes it difficult for them to cross the hydrophobic lipid bilayer. The charged particles are repelled by the hydrophobic tails of the phospholipids, and therefore, cannot pass through the membrane freely.
In summary, the selective permeability of the plasma membrane is due to the chemistry of the phospholipids, which create a hydrophobic barrier that is impermeable to water-soluble substances. Larger polar molecules and ions cannot freely cross the lipid bilayer because they are attracted to water and have an electrical charge that repels them from the hydrophobic interior of the membrane.
explain how a bacterial cell can be genetically modified to glow in the dark.
Answers
The process of genetically modifying a bacterial cell to produce a glowing effect is called genetic transformation.
How does genetic transformation work?This is usually achieved through the insertion of a foreign piece of DNA, such as a gene for bioluminescence, into the bacterial cell's genetic material.
One common method for introducing new DNA into bacterial cells is through a process called electroporation. This involves briefly exposing the cells to an electrical pulse, which temporarily disrupts the cell membrane and allows the foreign DNA to enter.
Once the foreign DNA has been incorporated into the bacterial cell's genome, it can be expressed and translated into a protein that produces the glowing effect. In the case of bioluminescence, the gene for the bioluminescent protein is expressed, leading to the production of the protein that emits light.
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