1
Bio 207 Exam 2 Questions with Answers (100% Correct
Answers)
The following figure diagrams three pathways for the catabolism of
glucose. Pathway ________ is most likely to be used for biosynthesis
because it can be used to ________. Answer: pentose phosphate; make
carbon backbones of many lengths
To begin the Krebs cycle, pyruvate must be converted into... Answer:
Acetyl-CoA
Which of the following pairs is mismatched? Answer: glyoxylate
bypass—2 NADH, 1 FADH2
The enzyme pyruvate kinase catalyzes the conversion of
phosphoenolpyruvate to pyruvate; the phosphate group is transferred
to ADP to form ATP. This reaction is an example of Answer: ATP
synthesis by substrate-level phosphorylation.
Which of the following is NOT a substrate for catabolism? Answer:
nitrogen gas
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,2
Suppose a cell is fed C14 radiolabeled acetyl-CoA for 1 hour, followed
by unlabeled acetyl-CoA for 1 hour. Assuming the Krebs cycle proceeds
without use of the glyoxylate bypass, how would we expect
radioactivity of the cell to change throughout the experiment? Answer:
Radioactivity of the cell would increase during the first hour due to
accumulation in Krebs cycle intermediates, then return to normal as the
C14 is released as carbon dioxide
In the pentose phosphate shunt, glucose 6-phosphate is oxidized to 6-
phosphogluconate, which is then decarboxylated to ribulose 5-
phosphate. What is the main metabolic role of this pathway? Answer:
production of carbohydrates to be utilized in biosynthesis
A reaction in which a compound with a small reduction potential
donates electrons (reduces) a compound with a large reduction
potential is usually... Answer: Favorable, with a negative ΔG value
The energy yield from fermentation is lower than from respiration
because Answer: respiration completely oxidizes glucose to CO2,
resulting in greater generation of NADH and thus ATP.
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, 3
When double-stranded DNA replicates, the newly made strand is
related to its template strand in that the two strands have Answer:
complementary sequences and are antiparallel to each other.
Besides the DNA residing in the nucleoid, two other kinds of DNA
molecules that may be present in the cytoplasm of a bacterial cell are
________ and the genomes of ________. Answer: plasmids;
bacteriophages
The sliding clamp is used to tether the DNA polymerase to the
chromosome and is loaded by Answer: clamp-loading complex
DNA replication is semi-conservative because Answer: one strand in
each daughter cell in newly synthesized
Which of the following is true of the DNA double helix? Answer: RNA
polymerase can use DNA as a template
During replication, the lagging strand is synthesized ________, while the
leading strand can be synthesized ________. Answer: discontinuously;
continuously
© 2025 All rights reserved
Bio 207 Exam 2 Questions with Answers (100% Correct
Answers)
The following figure diagrams three pathways for the catabolism of
glucose. Pathway ________ is most likely to be used for biosynthesis
because it can be used to ________. Answer: pentose phosphate; make
carbon backbones of many lengths
To begin the Krebs cycle, pyruvate must be converted into... Answer:
Acetyl-CoA
Which of the following pairs is mismatched? Answer: glyoxylate
bypass—2 NADH, 1 FADH2
The enzyme pyruvate kinase catalyzes the conversion of
phosphoenolpyruvate to pyruvate; the phosphate group is transferred
to ADP to form ATP. This reaction is an example of Answer: ATP
synthesis by substrate-level phosphorylation.
Which of the following is NOT a substrate for catabolism? Answer:
nitrogen gas
© 2025 All rights reserved
,2
Suppose a cell is fed C14 radiolabeled acetyl-CoA for 1 hour, followed
by unlabeled acetyl-CoA for 1 hour. Assuming the Krebs cycle proceeds
without use of the glyoxylate bypass, how would we expect
radioactivity of the cell to change throughout the experiment? Answer:
Radioactivity of the cell would increase during the first hour due to
accumulation in Krebs cycle intermediates, then return to normal as the
C14 is released as carbon dioxide
In the pentose phosphate shunt, glucose 6-phosphate is oxidized to 6-
phosphogluconate, which is then decarboxylated to ribulose 5-
phosphate. What is the main metabolic role of this pathway? Answer:
production of carbohydrates to be utilized in biosynthesis
A reaction in which a compound with a small reduction potential
donates electrons (reduces) a compound with a large reduction
potential is usually... Answer: Favorable, with a negative ΔG value
The energy yield from fermentation is lower than from respiration
because Answer: respiration completely oxidizes glucose to CO2,
resulting in greater generation of NADH and thus ATP.
© 2025 All rights reserved
, 3
When double-stranded DNA replicates, the newly made strand is
related to its template strand in that the two strands have Answer:
complementary sequences and are antiparallel to each other.
Besides the DNA residing in the nucleoid, two other kinds of DNA
molecules that may be present in the cytoplasm of a bacterial cell are
________ and the genomes of ________. Answer: plasmids;
bacteriophages
The sliding clamp is used to tether the DNA polymerase to the
chromosome and is loaded by Answer: clamp-loading complex
DNA replication is semi-conservative because Answer: one strand in
each daughter cell in newly synthesized
Which of the following is true of the DNA double helix? Answer: RNA
polymerase can use DNA as a template
During replication, the lagging strand is synthesized ________, while the
leading strand can be synthesized ________. Answer: discontinuously;
continuously
© 2025 All rights reserved
