A) fermentation
B) anaerobic
C) aerobic
D) catabolism
2. An example of anaerobic
would be
A) production of sulfates
from H2S
B) production of methane by
methanogens
C) glycolysis by purple
bacteria
D) utilization of methane by
methanogens
3. The end product of
glycolysis is
A) NADH
B) acetyl-CoA
C) lactate
D) pyruvate
4. The final output of the
Krebs cycle includes all of the following except
A) NADP
B) FADH2
C) ATP
D) CO2
5. The usefulness of
fermentation as a means of deriving energy is limited because
A) it cannot generate enough
ATP
B) it produces too much NH2
C) the end products are
toxic to the producer
D) it uses more energy than
it produces
6. Which of the following
is not a product of fermentation?
A) CO2
B) O2
C) ethanol
D) lactate
E) all of the above are
products of fermentation
7. What substance is
produced by the oxidation of pyruvate and feeds into the citric acid cycle?
A) pyruvate
B) glucose
C) acetyl-CoA
D) O2
E) CO2
8. Glycolysis has an
efficiency level of approximately
A) 2%
B) 3.5%
C) 21.5%
D) 50%
E) 78.5%
9. Hans Krebs discovered
(worked out the details of)
A) glycolysis
B) fermentation
C) the oxidation of pyruvate
D) the citric acid cycle
E) electron transport and
chemiosmosis
10. Oxidative respiration
in eukaryotes has an efficiency level of approximately
A) 2%
B) 63%
C) 14%
D) 36%
E) 32%
11. In aerobic cellular
respiration, which generates more ATP, substrate-level phosphorylation or
chemiosmosis?
A) substrate-level phosphorylation
B) chemiosmosis
C) both generate the same
amount of ATP
D) neither generates any ATP
12. What role does O2 play
in aerobic respiration?
A) it plays no role
B) it combines with
acetyl-CoA at the start of the Krebs cycle
C) it is given off as a
by-product during the oxidation of pyruvate
D) it combines with H2O to
help drive the formation of ATP
E) it is the final electron
acceptor at the end of the electron transport chain
13. During aerobic
respiration, FADH2 is produced in
A) glycolysis
B) the oxidation of pyruvate
C) the Krebs cycle
D) the electron transport
chain
E) fermentation
14. NADH is produced
during
A) glycolysis
B) the oxidation of pyruvate
C) the Krebs cycle
D) all of the above
E) none of the above
15. Organisms that do not
have the ability to produce or synthesize their own food are called
A) anaerobic
B) autotrophs
C) exergonic
D) catabolic
E) heterotrophs
16. The proper sequence of
stages in glycolysis is
A) glucose priming, cleavage
and rearrangement, oxidation, ATP generation
B) cleavage and
rearrangement, glucose priming, ATP generation, oxidation
C) glucose priming,
oxidation, cleavage and rearrangement, ATP generation
D) ATP generation,
oxidation, glucose priming, cleavage and rearrangement
E) oxidation, cleavage and
rearrangement, ATP generation, glucose priming
17. During what stage of
cellular respiration is the most ATP synthesized?
A) glycolysis
B) oxidation of pyruvate
C) Krebs cycle
D) fermentation
E) chemiosmosis
18. Catabolic processes
A) make complex molecules
from simpler ones
B) break complex molecules
into simpler ones
C) occur only in autotrophs
D) occur only in
heterotrophs
E) none of the above
19. What substance is
regenerated by fermentation?
A) O2
B) NAD+
C) acetyl-CoA
D) ATP
E) glucose
20. Which of the following
is a multienzyme complex?
A) glyceraldehyde-3-phosphate
(G3P)
B) NAD+
C) FAD+
D) pyruvate dehydrogenase
E) all of the above
21. During chemiosmosis in
aerobic respiration, protons are pumped
A) out of the cell
B) out of the mitochondria
into the cell cytoplasm
C) out of the mitochondrial
matrix into the outer compartment of the mitochondria
D) out of the cell cytoplasm
into the matrix of the mitochondria
E) out of the nucleus and
into the mitochondria
22. Each molecule of FADH2
results in the production of how many ATP molecules during aerobic respiration?
A) 2
B) 3
C) 4
D) 18
E) 36
23. Which of the following
organisms carries out cellular respiration?
A) a corn plant
B) a dog
C) a yeast
D) a bacterium
E) all of the above
24. Oxidizing which of the
following substances yields the most energy?
A) proteins
B) glucose
C) fatty acids
D) alcohol
E) water
25. The oxidation of
glucose to two molecules each of pyruvate, ATP, and NADH is called ________ and
occurs in the ________.
A) glycolysis; cytoplasm
B) fermentation; cytoplasm
C) the Krebs cycle; matrix
of the mitochondrion
D) anaerobic respiration;
cytoplasm
E) the respiratory electron
transport chain; cristae of the mitochondrion
26. A cell culture was
supplied with radioactively labeled O2. The cells were monitored. In a few
minutes the radioactive oxygen atoms were present in which of the following
compounds:
A) carbon dioxide
B) NADH and FADH2
C) water
D) ATP
E) lactic acid
27. During respiration,
NADH donates two electrons to the carrier know as ubiquinone. When this
happens, ubiquinone:
A) becomes oxidized.
B) passes the electrons
directly to O2 which is reduced to water.
C) pumps protons across the
inner mitochondrial membrane.
D) all of the above.
E) a and b, but not c.
28. The final electron
acceptor in lactic acid fermentation is:
A) NAD+
B) pyruvate
C) O2
D) lactic acid
E) ATP
29. Under normal
conditions, as electrons flow down the electron transport chain of the
mitochondria:
A) NADH and FADH2 are
oxidized.
B) the pH of the matrix
increases.
C) the electrons lose free
energy.
D) an electrochemical
gradient is formed.
E) all of the above.
30. Pyruvate is oxidized
when oxygen is present.
A) True
B) False
31. During the oxidation
of glucose, a net gain of ATP only occurs under aerobic conditions.
A) True
B) False
32. ATP can be formed
through substrate-level phosphorylation and this process requires
A) an input of energy
B) a high-energy phosphate
group that is transferred directly to ADP
C) a concentration gradient
of protons
D) the protein ATPsynthase
E) all of the above
33. Proteins and fats can
be nutritional sources of energy provided that
A) they are converted into
glucose
B) the enter their own
pathways that are separate from the glucose metabolic pathways
C) they are degraded
completely into atoms before entering a pathway
D) they are modified so that
they can enter the glucose metabolic pathways
E) both b and c
34. ATP formation by
glycolysis
A) occurs through aerobic
respiration
B) is an extremely efficient
method of acquiring energy by the cell
C) requires oxygen
D) involves substrate-level
phosphorylation
E) both a and c
35. Under which condition
would you expect the mitochondrial proton gradient to be highest and therefore
ATP synthesis to proceed?
A) pyruvate (present)-oxygen
(present)-ATP levels (high)
B) pyruvate (present)-oxygen
(present)-ATP levels (low)
C) pyruvate (present)-oxygen
(absent)-ATP levels (high)
D) pyruvate (absent)-oxygen
(present)-ATP levels (low)
E) pyruvate (absent)-oxygen
(absent)-ATP levels (high)
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