Bio 207 Exam 2 UPDATED Exam Questions
and 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 ________. - CORRECT
ANSWER - pentose phosphate; make carbon backbones of many lengths
To begin the Krebs cycle, pyruvate must be converted into... - CORRECT ANSWER -
Acetyl-CoA
Which of the following pairs is mismatched? - CORRECT 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 - CORRECT
ANSWER - ATP synthesis by substrate-level phosphorylation.
Which of the following is NOT a substrate for catabolism? - CORRECT ANSWER -
nitrogen gas
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? - CORRECT
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? -
CORRECT 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... - CORRECT ANSWER -
Favorable, with a negative ΔG value
The energy yield from fermentation is lower than from respiration because - CORRECT
ANSWER - respiration completely oxidizes glucose to CO2, resulting in greater
generation of NADH and thus ATP.
When double-stranded DNA replicates, the newly made strand is related to its template strand in
that the two strands have - CORRECT 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 ________. -
CORRECT ANSWER - plasmids; bacteriophages
The sliding clamp is used to tether the DNA polymerase to the chromosome and is loaded by -
CORRECT ANSWER - clamp-loading complex
DNA replication is semi-conservative because - CORRECT ANSWER - one strand in
each daughter cell in newly synthesized
Which of the following is true of the DNA double helix? - CORRECT ANSWER - RNA
polymerase can use DNA as a template
During replication, the lagging strand is synthesized ________, while the leading strand can be
synthesized ________. - CORRECT ANSWER - discontinuously; continuously
What region of the chromosome in E. coli is involved in the replication termination process? -
CORRECT ANSWER - ter
and 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 ________. - CORRECT
ANSWER - pentose phosphate; make carbon backbones of many lengths
To begin the Krebs cycle, pyruvate must be converted into... - CORRECT ANSWER -
Acetyl-CoA
Which of the following pairs is mismatched? - CORRECT 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 - CORRECT
ANSWER - ATP synthesis by substrate-level phosphorylation.
Which of the following is NOT a substrate for catabolism? - CORRECT ANSWER -
nitrogen gas
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? - CORRECT
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? -
CORRECT 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... - CORRECT ANSWER -
Favorable, with a negative ΔG value
The energy yield from fermentation is lower than from respiration because - CORRECT
ANSWER - respiration completely oxidizes glucose to CO2, resulting in greater
generation of NADH and thus ATP.
When double-stranded DNA replicates, the newly made strand is related to its template strand in
that the two strands have - CORRECT 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 ________. -
CORRECT ANSWER - plasmids; bacteriophages
The sliding clamp is used to tether the DNA polymerase to the chromosome and is loaded by -
CORRECT ANSWER - clamp-loading complex
DNA replication is semi-conservative because - CORRECT ANSWER - one strand in
each daughter cell in newly synthesized
Which of the following is true of the DNA double helix? - CORRECT ANSWER - RNA
polymerase can use DNA as a template
During replication, the lagging strand is synthesized ________, while the leading strand can be
synthesized ________. - CORRECT ANSWER - discontinuously; continuously
What region of the chromosome in E. coli is involved in the replication termination process? -
CORRECT ANSWER - ter
