Which of these is NOT one of the 4 chemicals used in DNA?
A. Adrenaline
B. Cytosine
C. Thymine
D. Adenine
Answer:
A. Adrenaline
Explanation:
adrenaline is a hormone
Answer:
A. Adrenaline
Explanation:
A is NOT correct because the actual 4 chemicals in DNA are Adenine,Cytosine, Thymine and Guanine.
Adrenaline is NOT part of the 4 chemicals of the DNA, which makes A correct answer.
4. Which statement describes the nutrient cycle?
the movement of nutrients within plants that allows them to conduct photosynthesis
the movement of nutrients within all soil layers that allow plants to grow and seeds to germinate
the movement of the three non-mineral nutrients that are absorbed through the soil
the movement of nutrients from the physical environment into living organisms and back again
Answer:
The correct answer is - the movement of nutrients from the physical environment into living organisms and back again
Explanation:
Answer:
D/ The movement of nutrients from the physical environment into living organisms and back again.
Explanation:
I took the test and got it right
What active reading stragery inviles the readers best guses about what will happen next in the text
Answer:
Paraphrasing Readers re-state and re-write text in their own words to capture the main focus of the reading. This strategy forces readers to pay close attention to the author's ideas and helps improve the readers’ level of understanding. Predicting Readers make predictions or “best guesses” about what will happen next.
Explanation:
In systemic circulation, a drop of blood that is [ Select ] ["poor in oxygen", "rich in oxygen"] in the [ Select ] ["right atrium", "left atrium", "right ventricle"] will first travel through the [ Select ] ["pulmonary semilunar valve", "aortic semilunar valve", "tricuspid valve", "bicuspid valve"] to reach the left ventricle. From there it will be pumped through the [ Select ] ["bicuspid valve", "pulmonary semilunar valve", "aortic semilunar valve", "tricuspid valve"] to reach the [ Select ] ["aorta", "pulmonary artery", "pulmonary trunk", "superior vena cava"] , which will branch into smaller arteries and arterioles. The blood leaving the arterioles will enter the capillaries surrounding the systemic tissues. The blood exiting the capillaries is [ Select ] ["rich in oxygen", "poor in oxygen"] and will first travel in venules, which will fuse into bigger veins. Eventually the blood will enter into the [ Select ] ["right ventricle", "left atrium", "right atrium", "left ventricle"] via either [ Select ] ["aorta or pulmonary artery", "pulmonary artery or pulmonary vein", "superior vena cava or inferior vena cava"]
In systemic circulation, a drop of blood that is rich in oxygen in the left atrium will first travel through the bicuspid valve to reach the left ventricle. From there it will be pumped through the aortic semilunar valve to reach the aorta which will branch into arterioles.
The blood exiting the capillaries is poor in oxygen and will first travel in venules, which will fuse into bigger veins. Eventually the blood will enter into the right ventricule via either superior vena cava or inferior vena cava.
What is Systemic circulation?This involves blood vessels supplying oxygenated blood to and returning deoxygenated blood from the tissues of the body.
The appropriate processes and steps can be seen above.
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Which of the following is a distinction between the Krebs cycle in eukaryotes and prokaryotes?
A. Prokaryotes do not use acetyl CoA.
B. The process occurs in the cytoplasm of Eukaryotes.
C. The process occurs in the mitochondria of Eukaryotes.
D. Eukaryotes do not produce carbon dioxide.
E. Prokaryotes do not produce FADH2.
Answer:
C. The process occurs in the mitochondria of Eukaryotes.
Explanation:
In eukaryotes: glycolysis takes place within cytosol, Krebs cycle within mitochondrial matrix & ETC within inner mitochondrial membrane. Prokaryotes undergo binary fission(only cytokinesis) & conjugation.Prokaryotes undergo binary fission(only cytokinesis) & conjugation. Eukaryotes perform mitosis, meiosis(both karyokinesis and cytokinesis).Therefore in prokaryotic cells, the citric acid cycle occurs in the cytoplasm; in eukaryotic cells, the citric acid cycle takes place in the matrix of the mitochondria.
Acetyl-CoA reacts in the first step of the eight step sequence of reactions that comprise the Krebs cycle, all of which occur inside mitochondria of eukaryotic cells. While the Krebs cycle does produce carbon dioxide, this cycle does not produce significant chemical energy in the form of adenosine triphosphate (ATP) directly, and this reaction sequence does not require any oxygen. Instead, this cycle produces NADH and FADH2, which feed into the respiratory cycle, also located inside of the mitochondria. It is the respiratory cycle that is responsible for production of large quantities of ATP and consumption of oxygen. In addition, the respiratory cycle converts NADH and FADH2 into reactants that the Krebs cycle requires to function. Thus, if oxygen is not present, the respiratory cycle cannot function, which shuts down the Krebs cycle. For this reason, the Krebs cycle is considered an aerobic pathway for energy production.
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The diagram below represents one way an enzyme can be inhibited (stopped).
Which statement explains the effect of an inhibitor on an enzyme?
The substrate will not be able to attach to the enzyme's active site.
O The enzyme will likely be attacked by immune cells.
Answer:
The answer is The substrate will not be able to attach to the enzyme's active site.
Because the function of inhibitors is to block the enzyme's activity
Explanation:
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The substrate will not be able to attach to the enzyme's active site. So the correct option is A.
What is an enzyme inhibitor?The inhibition is carried out by inhibitors that do not advance the product's development. The inhibitors may affect the enzyme as well as the substrate. Enzyme inhibition is the term used to describe the cessation of enzyme activity.
These enzyme inhibitors can bind to active regions and prevent further action by stopping it. Both reversible and irreversible forms of binding are possible. The ability of an inhibitor to block an enzyme may be irreversible or reversible depending on its unique function. Enzyme inhibitors can block the binding site, which reduces the enzyme's catalytic activity by preventing the substrate from binding to the active site.
Reversible inhibitors bind to enzymes by non-covalent interactions such as ionic bonds, hydrogen bonds, and hydrophobic contacts. Reversible inhibitors do not conduct chemical reactions when they are linked to an enzyme and are quickly removed by dilution or dialysis.
However, irreversible inhibitors usually covalently change an enzyme, making it impossible to reverse inhibition.
Therefore, the correct option is A.
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Complete this sentence: Energy that is not transferred to the next trophic level is mostly escaped as ________ energy.
heat
chemical
trophic
biomass
Answer: heat
Explanation:
Energy that is not transferred to the next trophic level is mostly escaped as heat energy.
About how many genes do humans have?
A. 46
B. 80,000
C. 23
D. 1.3 million
Answer:
20,500
Explanation:
HELP, define genetic engineering and Describe how DNA is modified for use in genetic engineering.
Answer:
Genetic engineering is deliberate modification of genome to gain desired traits.
The main steps of genetic engineering:
Restriction enzymes are used to isolate the required gene leaving it with sticky ends. Sticky ends are a short section of unpaired bases A vector, which is usually a bacterial plasmid or a virus, is cut by the same restriction enzyme leaving it with corresponding sticky ends. The vector and the isolated gene are joined together by ligase enzyme. The vector inserts the gene into required cells. The genes are transferred to animal, plant or microorganism cells, during early development, which allows them to develop with the desired characteristics.
Bacteria are prokaryotes that lack which of the following structures?
Group of answer choices
DNA
Cell wall
Nucleus
Ribosomes
which organelle
produces the cells energy
Here is a Answer to your question:
Mitochondria
Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).
I am sorry if this was not helpful
Hope this was helpful
Answer:
Mitochondria
Explanation:
Circular folds act to ______ the movement of chyme and ensure that it remains within the small intestine for maximal nutrient absorption.
Circular folds act to slow down the movement of chyme and ensure that it remains within the small intestine for maximal nutrient absorption.
What is digestion?Digestion is the physiological process of breaking down foods to obtain energy and matter by part of the body.
The chyme is a mass of food that has already been digested by different types of digestive enzymes.
The chyme is a mass generated by secretions in the stomach organ as well as in the small intestine.
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Look at the tropical grassland ecosystem.
Picture of tropical grassland with zebras and wildebeests feeding on grasses. Giraffes are in the background, along with bush trees.
Picture of tropical grassland with zebras and wildebeests feeding on grasses. Giraffes are in the background, along with bush trees.
There are more zebra than the carrying capacity of the pictured ecosystem. This represents a
climax community
biological surplus
peak phenomenon
sigmoid phenomenon
Answer:
It is B Biological Surplus
Explanation:
Biological Surplus means that a species population has grown too big, above carrying capacity
The diagram shows that a cottontail rabbit gained 400 KJ of energy when it consumed a plant. The cottontail rabbit was later eaten by a barn owl, but the owl only gained 50 KJ of energy from consuming the rabbit. Which statement best explains why only 50 KJ of energy was passed on to the barn owl?
Answer: The total energy passed from one level to the next is only about one-tenth of the energy received from the previous organism. This means that an animal eating a plant will only get about ten percent of the energy that is stored in the plant
Explanation: it may be lost as faeces, thermal energy or may not be digested properly to get the derived energy
Which statement best describes the motion of the toy vehicle during the first 30 seconds of the
investigation?
Answer:
kinetic energy
Explanation:
if something is moving that means its kinetic if its still its potential
Environmentalists are monitoring an area of tropical forest that is being deforested because of human activities. The graph here shows the scientists' predictions based on the data they have collected. How is the ecosystem likely to change as a result? Select the two correct answers.
A. decrease in biodiversity
B. gain in oxygen
C. gain of species
D. loss of habitat
Answer: decrease in biodiversity - loss of habitat
Explanation:
Answer:loss of habitat and decrease in biodiversity
Explanation:
Eukaryotic cells, when compared
to prokaryotic cells, tend to be
which of the following?
A. smaller, but specialized
B. larger and more complex
C. larger, but simpler
D. smaller and simpler
( b )
Answer:
B. larger and more complex.
frog is an amphibion science subjects class 4
Answer:
yes a frog is an amphibion
Explanation:
correct
Explain how water travels throughout a food web.
Answer:
Water travels through out a food web because everything that is considered food needs the water to live or in this case become food for another animal or plant. It also travels by keeping the food web source full and alive.
Explanation:
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please please help me :( with just this one question PLEASE
Answer:
Square 1: AA
Square 2: Aa
Square 3: aa
Explanation:
The letters on the on outsides intersect in a way making diffent alleles
Name the five carbon sugar in a DNA neucleotide
Based on the information in the table, which of the following best explains why this bug population has changed since the introduction of the invasive plants?
o The bugs are unable to feed on native fruits.
Bugs with longer mouthparts have a survival advantage.
Bugs with smaller body lengths have a helpful adaptation.
o The bugs have started cross-breeding with a larger species.
The bug population has changed since the introduction of the invasive plants the bugs are unable to feed on native fruits.
Why the population of bug decrease?The population of bug decrease because the invasive plants reduce the population of native plants on which the bug feed. If the food for the bug decreases then the population of the bug is also decreases.
So we can conclude that the bug population has changed since the introduction of the invasive plants the bugs are unable to feed on native fruits.
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The best explanation for the change in the bugs after the introduction of invasive plants is that bugs with longer mouthparts have a survival advantage.
What is natural selection?Natural selection is the process by which individuals of a population that are better suited to their environment are more likely to survive and reproduce.
According to this question, a population of bugs have experienced an increment in the following features:
average length of mouthpartsaverage body lengthThis suggests that the bugs have become more adapted since the introduction of the invasive plants to enable them survive, hence, they developed longer mouthparts and body length.
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Climates are classified on_________
Why can’t penguin fly?
Answer:
No they cannot fly
Explanation:
Penguins dont have any feather to fly with
Answer:
Well, in a sense they really do fly, only through the water, not through the air. Their wing bones are fused straight, making the wing rigid and powerful like a flipper. Penguins don't really need to fly because they dive deep, and swim so that they can catch their prey. Their bodies have huge fat supplies, heavy muscles, and densely packed feathers. There’s no way they could fly with such short wings and heavy bodies.
Explanation:
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What is kyphosis caused by?
Answer:
Back Pain and Stiffness; kind of relation to Hunchback?
Explanation:
It happens when we have poor posture; positioning our arms & shoulders not how we normally position them - it can also happen when carrying heavy stuff or slouching.
Answer:
The ligaments and muscles that support the vertebrae can extend as a result of poor posture in childhood, such as leaning back in seats and carrying heavy backpacks. Kyphosis occurs when the thoracic vertebrae are pulled out of their usual position.
At each link of the food web, approximately_________
percent of the energy is passed on to the consumer and
approximately_________
percent of the energy is lost as
heat.
Approximately 10 percent of the energy is passed on to the consumer and approximately 90 percent of the energy is lost as heat.
What is a Food web?This refers to an interconnecting diagram that shows the overall food relationships between organisms in a particular environment.
90 percent of energy is usually lost as heat thereby allowing for the transfer of only 10 percent of energy to the consumers.
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Before uniformitarianism, what theory was widely accepted?
1.) Uniformitarianism is the only theory
2.) The law of superposition
3.) Catastrophism
Answer:
3.)CATASTROPHISM
Explanation:
catastrophism suggested the features seen on the surface of earth such as mountains,were formed by large abrupt changes or catastrophes
Which of these is a benefit of fish farming?
A. It poses a risk of disease for wild stocks.
B. It depletes fish populations.
C. It eases the demand on commercial fisheries.
D. It pollutes natural bodies of water.
Answer:
C
Explanation:
It's pretty simple really, just find the Benefit. Pollution is definitely a harmful effect, disease is also not a benefit, and depletion of fish population is bad, so easing demand on commercial fisheries is the answer
What process ensures that the normal number of chromosomes?.
Answer:
What processes ensure that the normal number of chromosomes is restored after each cell division? The process of mitosis duplicates the cell's DNA. This ensures that there will be enough chromosomes for both of the daughter cells.
How does artificial selection affect variation within a species when a specific trait continues to be bred?
It reduces the amount of variation.
It increases the amount of variation.
It has no impact on the amount of variation.
It causes variation to fluctuate with each generation.
The amount of variation is reduced when a specific trait continues to be bred.
What is artificial selection?Artificial selection is the process in which organisms are chosen by human for the breeding purpose in order to get the desired characteristics.
So we can conclude that It reduces the amount of variation when a specific trait continues to be bred.
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