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AP Biology: Exam Review: Practice Questions & Answers 100% Solved

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AP Biology: Exam Review: Practice Questions & Answers 100% Solved DNA/Biochemestry Test Correct answer--- 1. The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. On which macromolecules does pepsin act? A. carbohydrate B. protein C. DNA ...

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  • 8 août 2024
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AP Biology: Exam Review: Practice Questions & Answers
100% Solved
DNA/Biochemestry Test Correct answer---




1. The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze
peptide bonds. On which macromolecules does pepsin act?

A. carbohydrate

B. protein

C. DNA

D. lipid Correct answer-B. Protein




2. Egg whites consist primarily of water and the protein albumin. When you fry an egg, why
does the egg white turn from clear to white?

A. The protein becomes dissociated.

B. The protein acquires tertiary structure.

C. The protein becomes denatured.

D. The protein becomes dehydrated Correct answer-C. The Protein becomes denatured




3. Margarine is made by hydrogenating vegetable oils so that they take on the consistency of
butter. Which of the following is the chemical basis for this change from a liquid to a solid?

A. Fats are changed from unsaturated to saturated, allowing them to solidify.

B. Fats are changed from saturated to unsaturated, allowing them to solidify.

C. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify.

,AP Biology: Exam Review: Practice Questions & Answers
100% Solved
D. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify.
Correct answer-A. Fats are changed from unsaturated to saturated, allowing them to
solidify.




4. People who are lactose intolerant can often consume some products made from milk such as
cheese and yogurt. By comparison, people with a true milk allergy, which involves an immune
response to milk protein, cannot consume milk or products made from milk. Given this
information, which of the following statements is true?

A. The protein that causes a true milk allergy is lactose. B. All people who are lactose intolerant
are also allergic to milk.

C. Yogurt contains live and active cultures of Lactobacillus acidophilus bacteria and therefore
prevents an allergic response in people with a true milk allergy.

D. Lactose is a carbohydrate, not a protein and is therefore not the cause of true milk allergies.
Correct answer-D. Lactose is a carbohydrate, not a protein and is therefore not the cause
of true milk allergies.




5. Shivering is the result of uncontrollable contractions of skeletal muscle tissue in an effort to
increase heat production and raise body temperature. How does this process relate to ATP
hydrolysis?

A. ATP is converted directly to heat.

B. Muscle contractions in the form of shivering produces heat and warms the body.

C. ATP hydrolysis causes muscle contraction.

,AP Biology: Exam Review: Practice Questions & Answers
100% Solved
D. Muscle contractions require ATP hydrolysis. Energy is liberated by ATP hydrolysis and
converted into heat. Correct answer-D. Muscle contractions require ATP hydrolysis.
Energy is liberated by ATP hydrolysis and converted into heat.




6. Hemoglobin is a protein composed of four subunits, each with a binding site for oxygen.
When a molecule of O2 binds to any one of the subunits, the affinity of the other three subunits
for O2 is increased. What role is oxygen playing in this process?

A. enzyme

B. allosteric activator

C. allosteric inhibitor

D. substrate Correct answer-B. allosteric activator




7. While conducting an experiment, you realize that a competitive inhibitor was interfering with
your reaction. To overcome this problem, you

A. add a non-competitive inhibitor to the reaction.

B. decrease the concentration of the correct substrate in the reaction.

C. increase the concentration of the correct substrate in the reaction.

D. add an allosteric activator to the reaction. Correct answer-C. increase the
concentration of the correct substrate in the reaction.




8. After getting off the ski lift, you choose a trail that requires you to ski up a small incline before
beginning the downward section of the trail. In this scenario, the hill is analogous to

A. free energy.

, AP Biology: Exam Review: Practice Questions & Answers
100% Solved
B. potential energy.

C. kinetic energy.

D. activation energy. Correct answer-D. activation energy.




9. A new antibiotic has been developed that will use noncompetitive inhibitor enzyme
inhibition. This means that the

A. antibiotic will bind to the enzyme and alter the shape of the enzyme.

B. antibiotic will bind to the substrate and alter the shape of the substrate.

C. antibiotic will bind to the enzyme-substrate complex and alter its shape.

D. antibiotic will bind to the product that is being produced and alter its shape.

E. antibiotic will bind to the receptor proteins embedded in the phospholipid bilayer, which will
in turn close the channels. Correct answer-A. antibiotic will bind to the enzyme and alter
the shape of the enzyme.




10. Nucleic acids are created with

A. phosphodiester bonds

B. peptide bonds

C. a phosphate and two fatty acids bonded to glycerol

D. sugar polymers Correct answer-A. phosphodiester bonds

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