AP Biology: Exam Review Practice
Questions with Correct Answers 2024
DNA/Biochemestry Test - CORRECT ANSWER---
1. The digestive enzyme
... [Show More] 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.
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.
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.
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- [Show Less]