AP Biology Questions with CORRECT Answers
Question:
Alcohol dehydrogenase (ADH) is an enzyme that aids in the decomposition of ethyl
alcohol (C2H5OH) into nontoxic substances. Methyl alcohol acts as a competitive
inhibitor of ethyl alcohol by competing for the same active site on ADH. When attached
to ADH, methyl alcohol is converted to formaldehyde, which is toxic in the body. Which
of the following statements best predicts the effect of increasing the concentration of
substrate (ethyl alcohol), while keeping the concentration of the inhibitor (methyl
alcohol) constant?
Answer:
Competitive inhibition will decrease because the proportion of the active sites occupied
by substrate will increase
Question:
A researcher proposes a model to explain how enzyme-substrate interactions determine
enzyme specificity. The model is based on the idea that substrate molecules form
favorable interactions with the amino acid side chains in an enzyme's active site. Based
on the model, which of the following statements best explains an enzyme's specificity
for a particular substrate molecule?
Answer:
A molecule with negative charges interacts with positively charged side chains in the
enzyme's active site.
Question:
In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
Answer:
autotrophs
Question:
According to the induced fit hypothesis of enzyme catalysis, which of the following is
correct?
Answer:
The binding of the substrate changes the shape of the enzyme's active site.
, Question:
Which of the following is an electron energy carrier that plays a role in cellular
respiration?
Answer:
NADH
Question:
The following diagram is an absorption spectrum for an unknown pigment molecule.
What color would this pigment appear to you?
Answer:
blue
Question:
A student designs an experiment to investigate the influence of temperature on enzyme
function. The student's plan is presented in Table 1. Which test tubes are controls in the
experiment?
Answer:
Test tubes 1, 3, 5, and 7
Question:
Mitochondria are observed in plant cells that contain chloroplasts. Why do you find
mitochondria in photosynthetic tissues?
Answer:
Mitochondria are required to break down sugars and other materials for energy.
Question:
When ATP releases some energy, it also releases inorganic phosphate. What purpose
does this serve (if any) in the cell?
Answer:
The phosphate may be incorporated into any molecule that contains phosphate.
Question:
How many turns of the Calvin cycle does it take to produce one molecule of glucose?
Answer:
6
Question:
Alcohol dehydrogenase (ADH) is an enzyme that aids in the decomposition of ethyl
alcohol (C2H5OH) into nontoxic substances. Methyl alcohol acts as a competitive
inhibitor of ethyl alcohol by competing for the same active site on ADH. When attached
to ADH, methyl alcohol is converted to formaldehyde, which is toxic in the body. Which
of the following statements best predicts the effect of increasing the concentration of
substrate (ethyl alcohol), while keeping the concentration of the inhibitor (methyl
alcohol) constant?
Answer:
Competitive inhibition will decrease because the proportion of the active sites occupied
by substrate will increase
Question:
A researcher proposes a model to explain how enzyme-substrate interactions determine
enzyme specificity. The model is based on the idea that substrate molecules form
favorable interactions with the amino acid side chains in an enzyme's active site. Based
on the model, which of the following statements best explains an enzyme's specificity
for a particular substrate molecule?
Answer:
A molecule with negative charges interacts with positively charged side chains in the
enzyme's active site.
Question:
In any ecosystem, terrestrial or aquatic, what group(s) is (are) always necessary?
Answer:
autotrophs
Question:
According to the induced fit hypothesis of enzyme catalysis, which of the following is
correct?
Answer:
The binding of the substrate changes the shape of the enzyme's active site.
, Question:
Which of the following is an electron energy carrier that plays a role in cellular
respiration?
Answer:
NADH
Question:
The following diagram is an absorption spectrum for an unknown pigment molecule.
What color would this pigment appear to you?
Answer:
blue
Question:
A student designs an experiment to investigate the influence of temperature on enzyme
function. The student's plan is presented in Table 1. Which test tubes are controls in the
experiment?
Answer:
Test tubes 1, 3, 5, and 7
Question:
Mitochondria are observed in plant cells that contain chloroplasts. Why do you find
mitochondria in photosynthetic tissues?
Answer:
Mitochondria are required to break down sugars and other materials for energy.
Question:
When ATP releases some energy, it also releases inorganic phosphate. What purpose
does this serve (if any) in the cell?
Answer:
The phosphate may be incorporated into any molecule that contains phosphate.
Question:
How many turns of the Calvin cycle does it take to produce one molecule of glucose?
Answer:
6
