AP BIO UNIT 3 PRACTICE EXAM QUESTIONS WITH VERIFIED ANSWERS

AP BIO UNIT 3 PRACTICE EXAM
QUESTIONS WITH VERIFIED
ANSWERS
According to the data, the mice at 10oC demonstrated greater oxygen consumption
per gram of tissue than did the mice at 25oC. This is most likely explained by which
of the following statements? Two answers.

The mice at 10°C consumed less oxygen than the mice at 25°C.
The mice at 10°C had a higher rate of ATP production than the mice at 25°C. .
The mice at 25°C were more active than the mice at 10°C.
The mice at 10°C had a higher metabolic rate than the mice at 25°C. - ANSWER-
The mice at 10 C had a higher rate of ATP production than the mice at 25C

The mice at 10C had a higher metabolic rate than the mice at 25C

According to the chemiosmotic theory (chemiosmotic coupling), the energy required
to move protons from the mitochondrial matrix to the intermembrane space against a
concentration gradient comes most directly from

the hydrolysis of ATP
electrons flowing along the electron transport chain
photons of red or blue light
the breakdown of high-energy fatty acids in the mitochondrial matrix - ANSWER-The
electrons flowing along the electron transport chain

Two nutrient solutions are maintained at the same pH. Actively respiring
mitochondria are isolated and placed into each of the two solutions. Oxygen gas is
bubbled into one solution. The other solution is depleted of available oxygen. Which
of the following explanations are not true in why ATP production is greater in the
tube with oxygen than in the tube without oxygen? Two answers.

In the presence of oxygen, glycolysis produces more ATP than in the absence of
oxygen.
The rate of proton pumping across the inner mitochondrial membrane is higher in the
sample with oxygen.
In the absence of oxygen, oxidative phosphorylation produces more ATP than does
fermentation.
In the presence of oxygen, oxidative phosphorylation produces more ATP than does
fermentation. - ANSWER-In the presence of oxygen, glycolysis produces more ATP
than in the absence of oxygen

In the absence of oxygen, oxidative phosphorylation produces more ATP than does
fermentation

Oxygen consumption can be used as a measure of metabolic rate because oxygen
is

, necessary for fermentation to take place
required to break down the ethanol that is produced in muscles
necessary for ATP synthesis by oxidative phosphorylation
required by all living organisms - ANSWER-Necessary for ATP synthesis by
oxidative phosphorylation

See q13
Refer to Figure 9.2, showing the citric acid cycle, as a guide to answer the following
questions.


Starting with one molecule of isocitrate and ending with fumarate, what is the
maximum number of ATP molecules that could be made through substrate-level
phosphorylation?
1
4
6
2 - ANSWER-1

See q 14
Site of major ATP production
2
1
4
3 - ANSWER-1

See q15
Which of the following questions will best direct an investigation of the mechanism of
ATP synthase?
Can oxidative phosphorylation be uncoupled from the electron transport chain?
What is the source of the inorganic phosphate that is used to generate ATP from
ADP?
Can ATP synthase use the energy released by phosphorylation of ADP to pump
protons against a concentration gradient?
Is the phosphorylation of ADP by ATP synthase dependent on the formation of a
proton gradient? - ANSWER-Is the phosphorylation of ADP by ATP Synthase
dependent on the formation of a proton gradient?

A scientist claims that Elysia chlorotica, a species of sea slug, is capable of
photosynthesis.
Which of the following observations provides the best evidence to support the claim?

Elysia chlorotica will die if not exposed to light.
Elysia chlorotica grows when exposed to light in the absence of other food sources.
Elysia chlorotica grows in the dark when food sources are available.
Elysia chlorotica grows faster when exposed to light than when placed in the dark. -
ANSWER-Elysia chlorotica grows when exposed to light in the absence of other food
sources.