The RNA world hypothesis suggests that life on Earth began with a simple RNA molecule that could copy itself without help from other molecules. DNA, RNA, and proteins are central to life on Earth.
RNA was thought of as little more than a messenger between DNA and proteins, carrying instructions as messenger RNA (mRNA) to build proteins. However, RNA can do far more. It can drive chemical reactions, like proteins, and carries genetic information, like DNA. And because RNA can do both of these jobs, most scientists think life as we know it began in an RNA world, without DNA and proteins.
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WILL GIVE BRAINLIEST 20 POINTS
A young woman, who has acutely poor nutrition (due to her bulimia) and frequently takes various pharmaceutical drugs for recreational purposes, goes on a three-week vacation. She becomes incredibly sick on the first day with the flu, spending the entire vacation in bed. Five weeks after her return, she discovers that she is pregnant and in her 10th week. Which of the following is the greatest concern that a doctor may have about her pregnancy in regard to the effects of her lifestyle?
A.
neural tube defect
B.
poor milk production
C.
sleeplessness
D.
paternal genetic profiling
E.
fetal eating disorders
Answer:
neural tube defect
Explanation:
How is local humidity influenced by a flow of energy and the movement of matter in the form of water?
Answer: Evaporation!
Explanation:
One way in which energy can influence local humidity is through the process of evaporation. When energy is added to water, it can cause the molecules to vibrate more rapidly, which can eventually cause them to break free from the surface and turn into a gas. This process, called evaporation, can increase the amount of water vapor in the air, leading to higher humidity.
Answer:
The local humidity is influenced by the flow of energy and the movement of water in the air because these factors determine the amount of water vapor that the air can hold. The amount of water vapor that air can hold is directly related to its temperature - as the air temperature increases, the air can hold more water vapor. When the air is already saturated with water vapor, any additional moisture will condense into visible droplets, such as dew or fog. This process is known as condensation.
The movement of water in the air can also affect local humidity. If moist air moves into an area, it can increase the humidity in that area. Conversely, if dry air moves into an area, it can decrease the humidity. The movement of water in the air can be caused by a variety of factors, including differences in temperature and pressure, the presence of physical barriers, and the force of the wind.
Explanation:
1. Which of the following is not a microorganism, but helps bread rise in baking?
Yoghurt
Yeast
Bicarbonate of soda
Salt
Why are landfill liners NOT a reliable safeguard against aquifer contamination?
Because its dirty not good for a realiable safegurd and its against aquifer contamination everyday
question what was the name of the gene that was affected by this condition . Tell the function of this gene-what does it code for be very specific
The gene affected by this condition is known as the KCNH2 gene. This gene is located on the long arm of chromosome 7 and encodes a voltage-gated potassium channel.
The voltage-gated potassium channel is an integral membrane protein that is responsible for controlling the flow of potassium ions into and out of cells.
The KCNH2 gene is important for the normal functioning of cells in the body. It is essential for the maintenance of the resting membrane potential by regulating the flow of potassium ions. It is also involved in mediating the electrical activity of the heart and plays a critical role in cardiac repolarization. Mutations in the KCNH2 gene can lead to a variety of cardiac arrhythmias and other cardiac conditions, including long QT syndrome.
Long QT syndrome is a genetic disorder that affects the electrical activity of the heart and can cause syncope, cardiac arrest, and even sudden death. The KCNH2 gene is one of the genes that has been linked to this disorder. Mutations in this gene affect the normal functioning of the voltage-gated potassium channel, which can lead to a prolonged QT interval on an electrocardiogram (ECG). This can result in an increased risk of life-threatening arrhythmias and cardiac arrest.
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Explain why the process of cell differentiation occurs.
Answer: Cell differentiation is how generic embryonic cells become specialized cells. This occurs through a process called gene expression. Gene expression occurs because of certain signals in your body, both inside and outside of your cells. Cell differentiation occurs during multiple stages of development.
Answer:
this goes by cell size cell shape,membrane potential and metabolic activity. these changes are actually because of modifications in gene expression
What are examples of environmental variations?
Examples of environmental variations:
Hair length: The length at which you want to wear your hair.Scars from your own accidents .Your muscle strength is based on how much exercise you get.Piercings: whether you decide to get them or not.Environmental variation refers to an organism's capacity to significantly vary its PHENOTYPE in response to environmental factors. Plants exhibit the phenomenon the most clearly, possibly because they are permanently rooted in the earth. For instance, if a dandelion is planted in a garden border with other plants, it will develop an upright posture with long blossom stalks. If cultivated on a garden lawn, a different dandelion with a similar genotype will result in a PROCUMBENT habit with short flower stalks.
Climate, diet, accidents, culture, and way of life are only a few examples of the variables that might have an impact on an animal's or plant's characteristics. For instance, you will put on weight if you eat too much, and you will lose weight if you eat too little.
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Use this graphic to answer the question.
An environmentalist uses a bar graph, a diagram, and a map as part of a presentation to Congress about global
warming.
Based on the process outlined in the diagram, what has most likely caused the higher levels of global surface
temperature since the 1980s, as shown in the bar chart?
O decreased ocean temperatures
O increased levels of greenhouse gases
O decreased solar and mermal radiation
O increased global surface temperatures
The various greenhouse gases' varying contributions to global warming are as follows: planting trees can reduce CO2 by 60%. More carbon dioxide is removed from the atmosphere by trees than is released.
What effects of global warming have you personally noticed? How has it influenced the planet thus far?Storms, heat waves, floods, and droughts are just a few of the disasters that are getting worse as a result of rising temperatures. Warmer temperatures produce an atmosphere that can hold onto, release, and gather more water. This alters weather patterns such that wet areas get wetter and dry ones to get drier.
How are climate change and global warming-related?The heat from the sun gets trapped on Earth as a result of greenhouse gas production. Global warming and climate change result from this. The rate of global warming is presently higher than it has ever been. Weather patterns are shifting as a result of warming temperatures, which is also upsetting the natural order.
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In the digestive system many large molecules, such as proteins, are broken down into much smaller molecules. State what happens to these smaller molecules following digestion.
Smaller molecules are taken up into the bloodstream by epithelial cells that line the walls of the small intestine. The waste continues to the colon where water is absorbed and the dried waste is compacted into feces. It is stored until excreted from the anus through the digestive system
The digestive system breaks down the food we eat into its simplest forms: glucose (sugar), amino acids (which make up protein), and fatty acids (which make up fat). Absorbed by the flow, the nutrients are carried to every cell in the body.
The human digestive system consists of the gastrointestinal tract and the accessory digestive organs. Digestion breaks down food into smaller and smaller components until they are absorbed and absorbed by the body.
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Why might the amount of current and voltage in a circuit need to be juggled?
a.
Because too little current cannot travel far
c.
To keep power constant
b.
To avoid burning out wires
d.
In order to get the most power possible from a given voltage
Please select the best answer from the choices provided
A
B
C
D
To get maximum power from a given voltage, the amount of current and voltage needed to juggle in a circuit. So, the correct option is (D).
What is Voltage?Voltage is also called electric pressure, electric tension or potential difference which can be defined as the difference in electric potential between two points. In a static electric field, it describes the work required per unit charge to move a test charge between two points.
To maintain a certain amount of current passing through a circuit the voltage of a circuit is changed which is directly proportional to the current. Lowering the voltage will reduce the flow of current, when we assume that the resistance of the circuit remains the same depending on the demand the voltage changes and the current automatically changes.
Thus, to get maximum power from a given voltage, the amount of current and voltage needed to juggle in a circuit. So, the correct option is (D).
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Please help! best answer gets brainliest
Answer:
help with what ? theres nothing there
How do the wavelength and frequency of the colors change as you move through the rainbow?
Answer:
he more energy is used for one photon, the smaller the wavelength of light. Since frequency is inversely proportional to wavelength you can also say: The more energy is used for one photon, the higher the frequency of light.
Explanation:
Answer:
As you move through the rain bow, wavelength reduces as frequency increases from red to violet.
When describing DNA replication we say that DNA polymerase synthesizes the new strand in a 5' to 3' direction, moving down the template strand from 3' to 5'. Briefly explain why replication always proceeds in this direction
DNA replication occurs in a 5' to 3' direction because the enzymes used for replication, known as DNA polymerases, can only add nucleotides to the 3' end of an existing strand of DNA.
This is because the 3' end has an exposed hydroxyl (-OH) group which can be used to add to the growing strand of nucleotides. As such, the polymerase moves down the template strand from 3' to 5', adding new nucleotides in the 5' to 3' direction.
This ensures that the newly synthesised strand is complementary to the template strand, as newly added nucleotides are added in the same direction as the original strand.
Additionally, this directional synthesis also means that both strands of the DNA double helix can be synthesised simultaneously, with each strand serving as the template for the other. This ensures that the complete DNA molecule is correctly replicated in the same manner as the original strand.
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Some people worry that the increasing number of cell phones will cause cancer because of the energy of the radio waves they emit. Cell phones are a new technology that only recently became widely used. And because cancer takes years to develop, the amount of risk is not yet known.
Answer:
No.
Explanation:
There is no clear evidence which indicates that cell phones will cause cancer because they emit very low intensity of radio waves but it can cause other diseases. Diseases such as brain tumor, male infertility and ear hearing function can be adversely affected by using cell phones due to the radio wave they emit. So we can say that cell phones will not the cause of cancer disease.
Answer:
No, the increasing number of cell phones will not the cause of cancer because it emits low intensity of radio waves. Radiations such as x-rays, gamma rays, alpha particles, beta particles, and neutrons are responsible for causing damage to the cell and the main cause of cancer. High intensity of radio waves heats up the cells not causing cancer disease so we can conclude that the increasing number of cell phones will not cause cancer disease in humans.
Explanation:
Which of the following matches enzyme components with their correct definition and/or function? a. Apoenzymes are the non-protein component of an enzyme. b. Apoenzymes are typically inorganic molecules, such as iron, zinc, or magnesium. song c. Coenzymes are organic cofactors important to enzyme activity. d. Cofactors are the protein components of enzymes.
c. Coenzymes are organic cofactors important to enzyme activity.
Enzymes are complex proteins that catalyze chemical reactions in the body. Enzyme activity can be influenced by other molecules, such as cofactors and coenzymes. Cofactors are non-protein molecules that bind to enzymes and can be either inorganic or organic.
Apoenzymes are the protein component of an enzyme, while coenzymes are organic molecules that bind to the enzyme temporarily and are necessary for the enzyme to function properly.
Coenzymes are organic cofactors important to enzyme activity while it's not typical that apoenzymes are typically inorganic molecules, such as iron, zinc, or magnesium, some enzymes do require metal ions as cofactors.
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In a far-off galaxy, an astronomer observes a moon orbiting a planet. The moon stays in orbit because of the planet’s gravity.
Which scenario would increase the gravity of the planet?
How many total permanent teeth should an adult have, assuming none have been lost or removed? -8 -16 -20 -32
Answer:
The correct answer is 32 teeth.
Explanation:
Hope it helped:)
What claim can you make about whether any of the individuals in one population have arm lengths similar to the individuals in the other population?
Subject is UCSD vs Laguna Mt juncos
Due of the larger range in the blue population's largest tower's height than in the yellow population.
They don't have to worry about the planet providing for them because they have a stable climate, which allows them to have children virtually all year round, and human-provided resources. Your traits, which are features or characteristics that you inherit from your parents, are determined by the information carried by your genes (say: trates). In the human body, each cell has between 25,000 and 35,000 genes. A common garden experiment reveals that individuals in the UCSD population had shorter wings and tails than those in the adjacent mountains, and the physical variations are genetically based.
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An organic compound is one that:
a contains carbon in all living things
b is slightly acidic in animals that live in water
c forms long chains in some living things
d is soluble in water in animals that live on land only
Which is an example of a stable ecosystem?
a crop of potatoes
a field of red tulips
a rain forest
all of the above
What are the main features of a bacteria do we use to classify them?
Bacteria can be classified on the basis of some of their main features which include their shape, mode of nutrition, mode of respiration and composition of their cell wall.
Bacteria are single-celled organisms which are able to survive in a wide range of conditions are found almost everywhere in the environment. They can be classified on the basis of some of their main features. The first feature is shape. Bacteria in nature can be found in different shapes which include rod-shaped, sphere, spiral etc. Another feature is their mode of nutrition which can be either heterotrophic or autotrophic.
The third feature can be their mode of respiration which can be either anaerobic or aerobic. Another feature is the composition of cell wall. The cell wall can be either peptidoglycan or lipopolysaccharide cell wall.
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Albinism results in the body being unable to make a protein needed for production of melanin, which gives up our skin, hair, and eye pigment. According to this pedigree, what kind of trait is albinism?
a. operon
b. recessive
c. dominant
d. sex-linked
Answer:
B. Recessive
Explanation:
Albinism is developed in an autosomal recessive pattern
help me please will give brainly
There are several terms that are used to describe invasive species. What are some of them? Try and come up with at least two other terms.
Pest species.
Nuisance species.
Weeds (In reference to plants)
Harmful non-native species.
What is it called when natural selection favors a certain trait?
A. directional selection
B. the wrong direction
C. natural selection
D. one direction
Answer:
C. natural selection
Explanation:
I hope this helped :)
Answer:
C
Explanation:
ILL GIVE BRAINLIEST JUST TO LET YOU KNOW ASAP
What is the relationship between tissues and organs?
• Scientists find life on Mars that is not made of cells.
• Scientists identify a cell organelle that practices the process of photosynthesis.
• Scientists determine that an organism is living if it is made of twenty structurally-identical cells.
• Scientists gather life from a volcano that is composed of cells which are very different from humans.
Answer:
Tissues and Organs? Cells are the basic building blocks of life, which can join together to form tissues, while different groups of tissues join together to form organs.
Explanation:
which of the following is an example of the changes that take place in an ecosystem during secondary succession
Explanation:
An example of secondary succession in an ecosystem is: Shrubs and trees regrow quickly in an area that has been burned during a forest fire.
19. Discuss Choose one of the hypotheses about
the function of the shark's head shape. Describe
how a scientist might design an experiment to
test the hypothesis,
Answer:
This unique head shape has been termed the cephalofoil in recognition of its wing-like appearance. ... Some suggest the cephalofoil acts like a canard to provide hydrodynamic lift and increase maneuvering capabilities. Another hypothesis is that the cephalofoil functions in prey manipulation.
Explanation:
WILL GIVE BRAINLIEST - What has happened to the temperatures since the Ice age?
A. Temperatures have decreased
B. Temperatures have slightly increased
C. Temperatures have increased a large amount
D. Temperatures have not changed at all
Answer:
C
Explanation:
Please mark brainliest
Answer:
b
Explanation:
Its called global warming
Suppose you want to produce a plant cultivar that has red flowers and speckled leaves. You have 2 cultivars, each having 1 of the desired traits. How would you proceed?
In desired traits, by breeding these two types of plants we will get a hybrid plant with the desired traits: red flowers and speckled leaves.
What do you mean by traits?A trait is a specific characteristic of an individual. Traits can be determined by genes, environmental factors or by a combination of both. Traits can be qualitative or quantitative.
Genes carry the information that determines your traits (say: trates), which are features or characteristics that are passed on to you — or inherited — from your parents. Each cell in the human body contains about 25,000 to 35,000 genes.
Biological traits describe species' physiology, morphology, life history, and behavior, capturing both inter-specific interactions and the connections between species and their environment.
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Which factor determines if you'll hear an echo of your voice half of a hard surface? A--your mass. B-temperature of the wall c--your height D-your distance from the wall
Answer:
D
Explanation: