AP BIOLOGY. UNIT 3 PRACTICE TEST
QUESTIONS AND ANSWERS
A tissue culture of vertebrate muscle was provided with a constant excess supply of
glucose under anaerobic conditions starting at time zero and the amounts of pyruvic
acid and ATP produced were measured. The solid line in the graph above
represents the pyruvic acid produced in moles per liter per minute. ATP levels were
also found to be highest at points A and C, lowest at B and D. A second culture was
set up under the same conditions, except that substance X was added, and the
results are indicated by the dotted line.
It is most reasonable to hypothesize that, in the breakdown of glucose, substance X
is - ANSWER-an inhibitor
A researcher claims that different enzymes exhibit maximal function over different pH
ranges. To test the claim, the researcher carries out an experiment that includes
three different enzymes: pepsin, salivary amylase, and arginase. The results of the
experiment are represented in Figure 1.
Which of the following actions will provide the most appropriate negative control for
the experiment? - ANSWER-repeating the experiment with denatured enzymes
The enzyme peroxidase is found in many organisms. It catalyzes the breakdown of
hydrogen peroxide into water and oxygen gas. The rate of peroxidase activity at
different pH values was assessed by students in the lab. The students' results are
shown in graph 1.
If the experiment is repeated at pH 11, the observed activity level of the enzyme will
most likely be - ANSWER-lower than the level at pH 9
The following questions refer to an experiment that is set up to determine the relative
volume of O2 consumed by germinating and nongerminating (dry) pea seeds at two
different temperatures. The change in volume is detected by using a respirometer
over a given period of time. The data are given below.
The rate of oxygen consumption in germinating pea seeds at 26ºC is - ANSWER-
0.05 mL / min
A researcher claims that some bacteria contain factors that influence the function of
a particular enzyme but other bacteria do not. To test the claim experimentally, the
researcher will grow two different bacterial strains in separate liquid cultures and
isolate the contents of the cells in each culture. The researcher will add different
combinations of cellular contents, substrate, and enzyme to test tubes containing a
buffer solution adjusted to the optimal pH of the enzyme and then measure the rate
of product formation. The design of the researcher's experiment is presented in
Table 1.
Which of the following statements best justifies the inclusion of test tubes 3 and 7 in
the experiment? - ANSWER-They will show whether the isolated cellular contents
have enzymatic activity.
Butterflies of the genus Colias live in the Rocky Mountains, where they experience a
wide range of temperatures. Different variants of a particular glycolytic enzyme in the
QUESTIONS AND ANSWERS
A tissue culture of vertebrate muscle was provided with a constant excess supply of
glucose under anaerobic conditions starting at time zero and the amounts of pyruvic
acid and ATP produced were measured. The solid line in the graph above
represents the pyruvic acid produced in moles per liter per minute. ATP levels were
also found to be highest at points A and C, lowest at B and D. A second culture was
set up under the same conditions, except that substance X was added, and the
results are indicated by the dotted line.
It is most reasonable to hypothesize that, in the breakdown of glucose, substance X
is - ANSWER-an inhibitor
A researcher claims that different enzymes exhibit maximal function over different pH
ranges. To test the claim, the researcher carries out an experiment that includes
three different enzymes: pepsin, salivary amylase, and arginase. The results of the
experiment are represented in Figure 1.
Which of the following actions will provide the most appropriate negative control for
the experiment? - ANSWER-repeating the experiment with denatured enzymes
The enzyme peroxidase is found in many organisms. It catalyzes the breakdown of
hydrogen peroxide into water and oxygen gas. The rate of peroxidase activity at
different pH values was assessed by students in the lab. The students' results are
shown in graph 1.
If the experiment is repeated at pH 11, the observed activity level of the enzyme will
most likely be - ANSWER-lower than the level at pH 9
The following questions refer to an experiment that is set up to determine the relative
volume of O2 consumed by germinating and nongerminating (dry) pea seeds at two
different temperatures. The change in volume is detected by using a respirometer
over a given period of time. The data are given below.
The rate of oxygen consumption in germinating pea seeds at 26ºC is - ANSWER-
0.05 mL / min
A researcher claims that some bacteria contain factors that influence the function of
a particular enzyme but other bacteria do not. To test the claim experimentally, the
researcher will grow two different bacterial strains in separate liquid cultures and
isolate the contents of the cells in each culture. The researcher will add different
combinations of cellular contents, substrate, and enzyme to test tubes containing a
buffer solution adjusted to the optimal pH of the enzyme and then measure the rate
of product formation. The design of the researcher's experiment is presented in
Table 1.
Which of the following statements best justifies the inclusion of test tubes 3 and 7 in
the experiment? - ANSWER-They will show whether the isolated cellular contents
have enzymatic activity.
Butterflies of the genus Colias live in the Rocky Mountains, where they experience a
wide range of temperatures. Different variants of a particular glycolytic enzyme in the
