Procedure for observing slide under microscope

Answers

Answer 1

Look through the eyepiece (1) and move the focus knob until the image comes into focus. Adjust the condenser (7) and light intensity for the greatest amount of light. Move the microscope slide around until the sample is in the centre of the field of view (what you see

Related Questions

Question 3. Marine ecosystems ( include at least 2 citations and reference)

a) Describe a major plant of the estuary ecosystem.
b)Use the plant above to describe the main features of all estuary plants

Answers

a) A major plant of the estuary ecosystem is Spartina alterniflora,

b) Estuary plants like the Spartina alterniflora, have some distinct features that allow them to thrive in the ecosystem.

they are able to survive in areas with high salinity levelsthey are able to withstand fluctuations in water levels and are most times submerged during high tides and exposed during low tides. They are able to survive in nutrient-poor soils by forming mutualistic relationships with bacteria.

what is the estuary ecosystem ?

Estuaries ecosystem are described as bodies of water where rivers meet the sea that provide homes for diverse wildlife, including popular fish species. They also support recreation, jobs, tourism, shipping, and more.

The Spartina alterniflora, is described as a perennial grass that is commonly found in salt marshes and estuaries along the Atlantic and Gulf coasts of the United States.

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What is the purpose of the cell wall?
Group of answer choices

to convert energy from the sun into glucose

to transport protein around the cell

to create protein

to provide structure for an organism

Answers

to provide structure for an organism

The answer: to provide structure for an organism.

14. You get a rare opportunity to study the Venezuelan poodle moth. This insect is named so as it looks like a poodle coat was put on a moth. The coat color of this rodent varies between white (dominant) and brown (recessive). Assume the population is in Hardy-Weinberg equilibrium. You observed 362 tan poodle moths and 138 brown poodle moths during your study.

Answers

To analyze the genetics of the Venezuelan poodle moth population, we can use the Hardy-Weinberg equilibrium equation:

p^2 + 2pq + q^2 = 1

where p is the frequency of the dominant allele (white coat) and q is the frequency of the recessive allele (brown coat). The equation states that the frequencies of the two alleles in the population must add up to 1, and that the frequencies of the three possible genotypes (white-white, white-brown, and brown-brown) must also add up to 1.

We can use the observed frequencies of the two coat colors to estimate the frequencies of the two alleles. Let's assume that the brown coat color is caused by a recessive allele, so q^2 represents the frequency of the homozygous brown-brown genotype. Then, we can set up the following equations:

q^2 = 138/500 = 0.276
p^2 + 2pq + q^2 = 1
p^2 + 2p(1-p) + 0.276 = 1
p^2 - 2p + 0.276 = 0

We can solve this quadratic equation for p using the quadratic formula:

p = [2 ± sqrt(4 - 4(0.276))]/2 = [2 ± 0.874]/2 = 1.437 or 0.563

Since p represents the frequency of the dominant allele (white coat), it must be less than 1. Therefore, we can discard the root p = 1.437 and conclude that:

p = 0.563
q = sqrt(0.276) = 0.526

These allele frequencies can be used to calculate the expected frequencies of the three genotypes:

white-white: p^2 = (0.563)^2 = 0.317
white-brown: 2pq = 2(0.563)(0.526) = 0.593
brown-brown: q^2 = (0.526)^2 = 0.276

We can compare these expected frequencies to the observed frequencies to test whether the population is in Hardy-Weinberg equilibrium. Let's use a chi-squared test with one degree of freedom:

χ^2 = Σ[(observed - expected)^2 / expected]
= [(362 - 317)^2 / 317] + [(138 - 276)^2 / 276]
= 5.70

The critical value of the chi-squared distribution with one degree of freedom and a significance level of 0.05 is 3.84. Since our calculated value of 5.70 is greater than the critical value of 3.84, we can reject the null hypothesis that the population is in Hardy-Weinberg equilibrium. This suggests that there may be some evolutionary forces at work, such as genetic drift, migration, mutation, or selection, that are causing the allele frequencies to deviate from the expected values.

Which are potential sources of error in the experiment? Check all that apply. estimating temperature to the nearest tenth of a degree estimating the mass of the sample to the nearest tenth of a gram estimating the thickness of the foam cups the position of the cups of sand and water under the heat lamp the brand of light bulb used for the heat lamp the air temperature outside the lab

Answers

Below are list of potential sources of error in the experiment:

Estimating temperature to the nearest tenth of a degreeEstimating the mass of the sample to the nearest tenth of a gramEstimating the thickness of the foam cupsThe position of the cups of sand and water under the heat lampThe brand of light bulb used for the heat lampThe air temperature outside the lab

What are experiments?

A hypothesis can be rigorously tested through a systematic procedure known as an experiment. In essence, experiments allow for controlled manipulations of variables while measuring their effects on outcomes.

Fields like science, psychology, medicine and engineering majorly utilize this technique to answer specific questions about phenomena.

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Answer:

Explanation:

Have a great day!

(d) The researcher performed a follow-up experiment to measure the rate of oxygen consumption by muscle and brain cells. Predict the effect of the MT-NDS mutation on the rate of oxygen tonsumption in muscle and brain cells. Justify your prediction. The researcher had hypothesized that the addition of the vitamin that is similar in structure to NADH would increase the activity of the mutated NADH dehydrogenase enzyme in individuals with the disorder. Explain how the vitamin most likely increased the activity of the enzyme.

Answers

The MT-NDS mutation results in a dysfunctional NADH dehydrogenase enzyme, which plays a crucial role in the electron transport chain in mitochondria. Since the electron transport chain is responsible for generating ATP, which is necessary for cellular energy production, it is likely that the MT-NDS mutation will result in a reduced rate of oxygen consumption in both muscle and brain cells.

What addition of the vitamin in structure to NADH do?

The addition of the vitamin similar in structure to NADH most likely increased the activity of the mutated NADH dehydrogenase enzyme by acting as a cofactor. Cofactors are non-protein molecules that help enzymes perform their functions. In this case, the vitamin is likely to act as an electron carrier, donating electrons to the NADH dehydrogenase enzyme and thereby helping to restore its function. This would result in an increased rate of oxygen consumption by muscle and brain cells in individuals with the disorder who are supplemented with the vitamin.

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From which direction would weather come to a city at 65-degrees north?

Answers

Weather in the Northern Hemisphere generally moves from west to east due to the prevailing westerly winds, which are caused by the rotation of the Earth. Therefore, a city located at 65-degrees north latitude would typically experience weather systems coming from the west or northwest. However, the exact direction of incoming weather can vary depending on the specific weather patterns and conditions in the region at a given time.

Which of the following is not a defining element of culture?
A. Information shared among a population
B. Written symbols
OC. Information that is internalized
D. Information that is socially transmitted

Answers

B. Written symbols is not a defining element of culture as not all cultures have a written language or symbols. However, information shared among a population, information that is internalized, and information that is socially transmitted are all essential components of culture.

Hope that helps! Have a nice day! <3

three do you think are the most important and why?

Answers

Answer:

there is nothing there

Explanation:

Which is the most common theme among several of the theories O water O volcanic energy O electrical energy Ospace

Answers

The most common theme among several of the theories listed is energy. Volcanic energy and electrical energy are both forms of energy, while water and space are not forms of energy but can be associated with energy in various ways. Hence options B and C are correct.

For example, water is often used to generate hydroelectric power, which is a form of energy. Space, on the other hand, is often studied in the context of astrophysics and the study of energy in the universe, such as dark matter and dark energy.

Therefore, while all of the options listed may be important and relevant in different fields of study, energy is a common theme that ties together several theories across different disciplines.

Hence options B and C are correct.

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15. Two Siamese and three Persian cats survive a shipwreck and are carried on driftwood to a previously uninhabited tropical island. All five cats have normal ears, but one carries the recessive allele for folded ears (his genotype is Ff). Calculate the frequencies of alleles F and f in the cat population of this island. If you assume Hardy-Weinberg equilibrium for these alleles (admittedly very improbable), about how many cats would you expect to have folded ears when the island population reaches 16,000?

Answers

To calculate the frequencies of the F and f alleles, we can use the allele frequency equation:

p + q = 1

where p is the frequency of the F allele and q is the frequency of the f allele. Since the population is small and we know the genotype of one of the cats, we can calculate the frequency of the f allele directly:

f = sqrt(q^2) = sqrt(1/5) = 0.447

Since the f allele is recessive, we can use the Hardy-Weinberg equation to calculate the frequency of the FF genotype (normal ears) as:

p^2 = 1 - 2pq - q^2 = 1 - 2(0.553)(0.447) - (0.447)^2 = 0.307

The frequency of the Ff genotype (normal ears) is given by:

2pq = 2(0.553)(0.447) = 0.494

The frequency of the ff genotype (folded ears) is:

q^2 = (0.447)^2 = 0.200

To estimate how many cats would have folded ears when the island population reaches 16,000, we can use the Hardy-Weinberg equation and assume that the population is in equilibrium:

p^2 + 2pq + q^2 = 1

The total number of cats with folded ears (ff genotype) would be expected to be:

ff = q^2 x 16,000 = 0.200 x 16,000 = 3,200

Therefore, we would expect about 3,200 cats to have folded ears in the island population when it reaches 16,000, assuming Hardy-Weinberg equilibrium. However, it is important to note that this assumption is unlikely to hold true in reality, as the small population size and genetic drift could lead to deviations from the expected frequencies.

4. If an atom has five protons, how do you know that it has five electrons as well?

Answers

Answer:

Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons (Table 4.5. 1). Therefore, the atomic number of an atom also tells you how many electrons the atom has.

Explanation:

1. What gametes would be produced by individuals of the following genotypes
(2pts)?
bbFf
Bbff
BbFf
AaDd

Answers

To determine the gametes that would be produced by individuals of the given genotypes, we need to use the principles of Mendelian genetics.

Mendel's law of segregation states that each individual has two alleles for a given trait and that these alleles separate during the formation of gametes, such that each gamete carries only one allele.

Using this principle, we can determine the gametes produced by individuals of the given genotypes as follows:

bbFf: This individual has the alleles b and F on one chromosome, and b and f on the other chromosome. The gametes produced by this individual would be bf and bF.

Bbff: This individual has the alleles B and f on one chromosome and b and f on the other chromosome. The gametes produced by this individual would be bf and Bf.

BbFf: This individual has the alleles B and F on one chromosome and b and f on the other chromosome. The gametes produced by this individual would be BF, Bf, bF, and bf.

AaDd: This individual has the alleles A and a on one chromosome, and D and d on the other chromosome. The gametes produced by this individual would be AD, Ad, aD, and ad.

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College Biology help please

Answers

Gene regulation through evo-devo mechanisms affects the number, size, shape, and identity of flower petals.

What are the methods of gene regulation in flower petals?

Gene regulation controls flower petal morphology through the process of gene expression, which is regulated by various evo-devo mechanisms.

The two main evo-devo mechanisms involved in regulating flower petal morphology are cis-regulatory elements and homeotic genes.

Cis-regulatory elements control the timing and location of gene expression by binding to transcription factors that activate or repress gene expression. These elements affect the number of flower petals, as well as their size and shape. For example, if a cis-regulatory element is activated during flower development, it can cause the formation of additional petals or change the shape of the petals.

Homeotic genes, on the other hand, control the identity of flower organs, such as petals, stamens, and sepals, by regulating the expression of other genes. Mutations in homeotic genes can lead to the transformation of one type of organ into another. For example, if a homeotic gene responsible for producing petals is mutated, it may result in the production of sepals instead of petals, or it may change the size or shape of the petals.

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2 Midori knows that plants grow from seeds. In what part of the plant are seeds formed?
A. leaves and roots
B. cones and leaves
C. stems and flowers
D. flowers and cones

Answers

Answer:

Explanation:

Question 3 (5 points)
Tommy comes home from a long day at school and opens his laptop to unwind. He
looks at his best friend Jack's social media profile and sees both negative and
positive pieces of Jack's digital reputation. From Jack's profile, which post is an
example of Jack's positive digital reputation?
A picture of Jack that shows him pouring alcohol for a friend
O A comment that says, "Congratulations, Bill, on getting the award. You deserve
it!"
A comment about last night's game that includes inappropriate language
A music video for a recent rap song with inappropriate words and images

Answers

An example of Jack's positive digital reputation from his profile is a comment that says, "Congratulations, Bill, on getting the award. You deserve it!" (option B).

What is digital reputation?

Digital reputation is the digital footprint created by all the things you say and do online, as well as what others post about you.

The people and sites one follows, the content one posts, likes or shares, and the comments one makes, all contribute to ones digital reputation.

According to this question, Tommy looks at his best friend, Jack's social media profile and sees both negative and positive pieces of Jack's digital reputation. The positive digital reputation is as mentioned above.

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What does these terms mean please?

Answers

Amniote: an animal whose embryo develops in an amnion and chorion and has an allantois; a mammal, bird, or reptile.

Vertebrate: (backbone) an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.

Click all that is true. The functions of proteins are:

transport important things in your body

build the structures of your body

enzymes to make chemical reactions go faster

send messages to cells

make antibodies to fight viruses

Answers

Answers:

2. build the structures of your body

3. enzymes to make chemical reactions go faster

5. make antibodies to fight viruses

The functions of proteins are:

transport important things in your body build the structures of your body enzymes to make chemical reactions go fastersend messages to cellsmake antibodies to fight viruses

What are the properties of protein?

Proteins are organic macromolecules made up of amino acids joined by peptide bonds. They have a complex and diverse structure and play many essential roles in the body. Some of the properties of proteins include:

Structural diversity: Proteins have a highly diverse structure, which is important for their many functions.

Amino acid composition: Proteins are made up of different combinations of 20 different amino acids.

Size: Proteins can vary greatly in size, from small peptides to large multi-subunit complexes.

Shape: Proteins can have complex 3D shapes that are critical to their function.

Solubility: Proteins can be either soluble or insoluble in water, depending on their structure and composition.

Stability: Proteins can be stable or unstable under certain conditions, such as changes in temperature, pH, or salt concentration.

Function: Proteins have a wide range of functions in the body, including structural support, enzyme catalysis, transport, and communication.

Denaturation: Proteins can lose their structure and function when exposed to certain physical or chemical conditions, a process known as denaturation.

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Question Which of the following is not a cardinal sign of Parkinson's disease?

Answers

Essential tremor is not a cardinal sign of Parkinson's disease.

Option D is correct.

What is Parkinson's disease?

Parkinson's disease is a disorder affecting the brain that results in unintentional or uncontrollable movements like trembling, stiffness, and issues with balance and coordination.

Early signs of Parkinson's disease include tremors, muscle stiffness, and sluggishness of movement, but there are also other symptoms to watch out for.

Essential tremor is not associated with other Parkinson's disease symptoms.

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Complete question:

Which of the following is not a cardinal sign of Parkinson's disease?

Stiffness

Difficulty moving

Shaking hands and feet

Essential tremor.

Gram-negative bacterial cell walls can increase a bacterium's virulence (infectious capability) because a component in the cell wall acts as a toxin. True or false

Answers

Answer: false

Explanation its function is to protect them from acids and also in some cases reproduction but they itsef didnt have any toxins in them

In DNA recombination, what is created when the DNA is opened up at the restriction site?
Responses

A double-stranded DNAdouble-stranded DNA

B RNARNA

C sticky ends

Answers

Answer:

C. Sticky ends.

Explanation:

C. Sticky ends.

When the DNA is opened up at the restriction site during DNA recombination, the enzyme creates a double-stranded cut leaving short, single-stranded overhangs called sticky ends. These sticky ends can base pair with complementary sticky ends generated by the same restriction enzyme on another DNA molecule, allowing the two DNA molecules to be joined together. This process is used in DNA cloning and other genetic engineering techniques.

Write two sentences to describe one similarity and one difference between personal and national budgets
(here's the passage if needed. i know its not much)

Answers

The similarity in the two is that the budget limits an amount of money given to prevent debt and an increase in taxes. The difference is that the personal budget is for your own use as in if you went to buy a car with a budget of $250k, a national budgets is more for the military/federal jobs.

The left atrium receives blood from the

Answers

Answer:

I got you

Explanation:

it receives blood from the heart

What name is giving to the bond between water molecules

Answers

It should be hydrogen bonds

Work with the person next to you to draw a picture of how you think gene expression (or protein synthesis) works. Label the part of your picture using words from the reading above

Answers

The picture of the gene expression process or protein synthesis is shown in the attachment.

What is gene expression?

Gene expression is the process through which a gene's information is used to create a functioning gene product, allowing it to produce end products like proteins or non-coding RNA and ultimately have an impact on phenotypes.

Gene expression involves the following stages:

transcription - the synthesis of mRNA from the DNA region containing the genetranslation - synthesis of proteins from the mRNA at the ribosomes

Environmental elements can change which genes in an animal are expressed, which in turn impacts the animal's phenotype. These environmental factors include nutrition, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens.

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Genetic engineering definition

Answers

Genetic engineering is the process of manipulating an organism's genetic material to alter its traits or characteristics. This can be done by adding, deleting, or changing specific genes within an organism's DNA. Genetic engineering has a wide range of applications, from the development of new medical treatments to the production of genetically modified crops !

Helpppppppppppppppppppppppppp

Answers

Answer:

B.) 4

Explanation:

Fe is for iron

H is for hydrogen
C is for carbon

O is for oxygen.

Help me write a research proposal Title: "Freshwater fish pond" (include sources and citations)

Answers

Answer:

Explanation:

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Which list of ordered pairs would form a parallelogram when connected by the line segments

Answers

According to the information, the correct answer is: (1, 5), (3, 2), (3, –2), (–2, –3)

Which list of ordered pairs would form a parallelogram?

To determine if a set of ordered pairs forms a parallelogram, we need to check if the opposite sides are parallel and of equal length.

For the first set of ordered pairs, we can see that the line segment connecting (1, 5) to (3, 2) is parallel to the line segment connecting (3, -2) to (-2, -3). Moreover, the distance between these two line segments is the same. Therefore, this set of ordered pairs forms a parallelogram.

For the second set of ordered pairs, we can see that the line segment connecting (-2, 2) to (-5, -2) is parallel to the line segment connecting (-4, -5) to (-1, -1). However, the distance between these two line segments is not the same. Therefore, this set of ordered pairs does not form a parallelogram.

For the third set of ordered pairs, we can see that the line segment connecting (3, 2) to (5, -2) is not parallel to the line segment connecting (-3, -2) to (-1, 2). Therefore, this set of ordered pairs does not form a parallelogram.

For the fourth set of ordered pairs, we can see that all the ordered pairs are the same, which means that we only have one point. Therefore, this set of ordered pairs does not form a parallelogram.

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Please help !!!!!!!!!!!

Answers

Answer:

1) Weathering, Erosion, Disposition

2) Physical weathering is the breakdown of large rocks into fragments by physical forces; the chemical composition of the rock is not changed. Chemical weathering is the breakdown of rock by chemical reactions; the chemical composition is changed.

3) The four forces of erosion are water, wind, gravity, and glaciers.

4) Because the velocity of the river slows down a great deal when it reaches the large body of water, the sediment that the river was carrying is deposited along the mouth of the large body of water.

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Abrasion: Abrasion is the breaking down and wearing away of rock material by the mechanical action of another rock. Three agents of physical weathering that cause abrasion are moving water, wind, and gravity. Also, rocks suspended in thence of a glacier can cause abrasion of other rocks on Earth's surface. This would be a prime example of physical weathering, or mechanical weathering.

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Acid Precipitation: Acid rain causes less erosion than normal rainwater does. Rainwater can break down rocks by dissolving minerals in the rocks. Acid rain is rainwater that is more acidic than normal rainwater. Acid rain can also dissolve the minerals in rocks faster than normal rainwater can. This is chemical weathering.

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Animal actions: Animal and plant mobility is a factor in biological weathering. For instance, a plant may grow in a gap in a rock and, as its roots spread, cause the fracture to expand. A rabbit may also burrow into a crack in a rock, making it wider and eventually separating the rock. This is an example of physical weathering.

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Ice wedging: Ice wedging ,sometimes known as frost wedging ,can also cause rocks to break apart. Ice wedging causes cracks in rocks to expand as water seeps in and the water freezes and expands opening the crack further. Rocks formed under pressure deep within earth can become exposed at the surface. This is physical weathering

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Oxidation: Oxidation is another kind of chemical weathering. It occurs when oxygen from air dissolves in water and combines with chemicals in the rocks to form oxides. if the rock contains a lot of iron, then oxidation produces a brown material called iron oxide. This looks like rust on the rock.

What is the difference between weathering erosion and deposition?

Weathering is the chemical and mechanical breakdown of exposed rock. The chemical changes alter the minerals and make them softer, and mechanical weathering physically breaks rock into smaller and smaller pieces.

Erosion is the REMOVAL of those chemically and mechanically softer and broken pieces of rock from their original locations, by gravity, water, ice or wind. Erosion is transport (and as a result, fresh unaltered rock is exposed to wind, water and weather, and THAT becomes weathered in turn). The material being transported is ‘sediment’: sand, silt, mud and gravel.

Deposition is when the weathered and eroded (transported) material is dropped and settles down elsewhere, forming a ‘deposit’ of transported rock material.

If this deposit remains undisturbed long enough, and is buried by enough arriving material, it will eventually go through compaction and chemical reactions forming cement between the grains - thus resulting in a brand new, sedimentary rock.

Weathering, erosion, transport, deposition, compaction and cementation are part of the ‘rock cycle’.

How can the complete rock cycle be described?

Let’s start with basalt that form at mid ocean spreading centers. At mid ocean spreading centers rock material from the earth’s mantle continuously melts due to continuous decreasing in pressure from the oceanic crust spreading at this point. The molten rock quickly cools at the earth’s surface and forms rock known as basalt that makes up the oceanic crust all over the world. The newly produced oceanic crust rock slowly moves towards a boundary with a continental crust where the oceanic crust subducts beneath the continental crust due to the oceanic crust having a higher density than the continental crust. This is where things get a bit more interesting.

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Converter - 10 °F 0°C

Answers

0 degrees Celsius is equivalent to 32 degrees Fahrenheit.

How to solve

To convert 10 degrees Fahrenheit to Celsius, you can use the formula:

Celsius = (Fahrenheit - 32) / 1.8

Plugging in the value of 10 degrees Fahrenheit, we get:

Celsius = (10 - 32) / 1.8

Celsius = -22 / 1.8

Celsius ≈ -12.22

Therefore, 10 degrees Fahrenheit is equivalent to approximately -12.22 degrees Celsius.

On the other hand, 0 degrees Celsius is equivalent to 32 degrees Fahrenheit. This can be determined by using the formula:

Fahrenheit = (Celsius * 1.8) + 32

Plugging in the value of 0 degrees Celsius, we get:

Fahrenheit = (0 * 1.8) + 32

Fahrenheit = 32

Therefore, 0 degrees Celsius is equivalent to 32 degrees Fahrenheit.