Biol 316 Exam PCQs Questions With Complete Solutions
19. The functioning of regulatory mechanisms that automatically
make adjustments to maintain internal constancy is called
c. homeostasis.
20. During childbirth, muscular contractions acting to expel the
fetus from the uterus induce hormonal signals that induce even
more intense contractions. This is an example of
d. positive feedback.
9. When an allosterically modulated enzyme is the rate-limiting
enzyme in a metabolic pathway, the entire pathway may be
upregulated or downregulated by allosteric modulation. The
result of downregulation of the entire pathway is called
a. feedback inhibition.
10. Testosterone is released by the testes in response to
luteinizing hormone, released from the pituitary gland. As
circulating testosterone levels rise, they act on the pituitary
gland to reduce the secretion of luteinizing hormone, thus
reducing the production of testosterone. This is an example of
b. negative feedback.
7. Human LDH-A4 and rat LDH-A4 together are a good
example of.
b. interspecific enzyme homologs
13. Which reaction is catalyzed by LDH?
,a. Pyruvic acid + NADH2 → lactic acid + NAD
6. The genes on the figure are aligned based on
a. homologous sequences.
24. Human LDH-B4 and rat LDH-B4 are examples of
d. interspecific enzyme homologs.
35. The figure shows the
b. frequency distribution of two different alleles of the gene for
LDH.
1. For the Antarctic icefish, a consequence of their lack of
hemoglobin is that they
b. are restricted to very cold water.
2. The coldest water that icefish typically inhabit is
c. -1.9°C.
36. What is the best explanation for why mammalian and fish
LDH-C enzymes are shown to be so distantly related?
c. The enzymes were named before the actual evolutionary
relationships were known.
3. Today, there are _______ species of icefish.
b. about 16
7. What is the best explanation for the differences, as shown in
the figure, in the icefish globin genes?.
d. Deletions have rendered the α-globin gene nonfunctional and
the β-globin gene has been removed.
,10. Which point(s) refer(s) to the most likely divergence(s) of
the hemoglobin-free icefish?
b. II
14. Which statement about the figure is true?
b. It shows the lineages of icefish that have lost functional
myoglobin.
18. In what way is the loss of functional hemoglobin in icefish a
disadvantage?
c. Icefish have enlarged hearts and faster blood circulation
compared to red-blooded fish.
14. Which statement about the figure is true?
b. It shows the lineages of icefish that have lost functional
myoglobin
20. Which protein is common in all species of icefish?
b. Antifreeze glycoproteins
20. Which statement about the insect circulatory system is true?
b. Insects have an open circulatory system and a tracheal system
for delivering O2.
9. When an allosterically modulated enzyme is the rate-limiting
enzyme in a metabolic pathway, the entire pathway may be
upregulated or downregulated by allosteric modulation. The
, result of downregulation of the entire pathway is called
a. feedback inhibition.
20. Which statement about the insect circulatory system is true?
b. Insects have an open circulatory system and a tracheal system
for delivering O2.
1. Icefish were once commonly called "bloodless fish" because
of b. the fact that their blood is clear. One unique feature of the
icefish is that they
b. are the only vertebrates that do not have red blood cells as
adults.
3. Which statement about icefish is true?
c. They do not have hemoglobin.
4. When researchers analyzed the DNA of icefish, they found
that the
a. β-globin gene was completely gone and the α-globin gene was
missing parts.
. The hearts of icefishd. can have myoglobin or not, depending
on the species.
6. Which statement regarding icefish evolution is true?
b. Only icefish share an ancestor that lost the function of globin
genes.
19. The functioning of regulatory mechanisms that automatically
make adjustments to maintain internal constancy is called
c. homeostasis.
20. During childbirth, muscular contractions acting to expel the
fetus from the uterus induce hormonal signals that induce even
more intense contractions. This is an example of
d. positive feedback.
9. When an allosterically modulated enzyme is the rate-limiting
enzyme in a metabolic pathway, the entire pathway may be
upregulated or downregulated by allosteric modulation. The
result of downregulation of the entire pathway is called
a. feedback inhibition.
10. Testosterone is released by the testes in response to
luteinizing hormone, released from the pituitary gland. As
circulating testosterone levels rise, they act on the pituitary
gland to reduce the secretion of luteinizing hormone, thus
reducing the production of testosterone. This is an example of
b. negative feedback.
7. Human LDH-A4 and rat LDH-A4 together are a good
example of.
b. interspecific enzyme homologs
13. Which reaction is catalyzed by LDH?
,a. Pyruvic acid + NADH2 → lactic acid + NAD
6. The genes on the figure are aligned based on
a. homologous sequences.
24. Human LDH-B4 and rat LDH-B4 are examples of
d. interspecific enzyme homologs.
35. The figure shows the
b. frequency distribution of two different alleles of the gene for
LDH.
1. For the Antarctic icefish, a consequence of their lack of
hemoglobin is that they
b. are restricted to very cold water.
2. The coldest water that icefish typically inhabit is
c. -1.9°C.
36. What is the best explanation for why mammalian and fish
LDH-C enzymes are shown to be so distantly related?
c. The enzymes were named before the actual evolutionary
relationships were known.
3. Today, there are _______ species of icefish.
b. about 16
7. What is the best explanation for the differences, as shown in
the figure, in the icefish globin genes?.
d. Deletions have rendered the α-globin gene nonfunctional and
the β-globin gene has been removed.
,10. Which point(s) refer(s) to the most likely divergence(s) of
the hemoglobin-free icefish?
b. II
14. Which statement about the figure is true?
b. It shows the lineages of icefish that have lost functional
myoglobin.
18. In what way is the loss of functional hemoglobin in icefish a
disadvantage?
c. Icefish have enlarged hearts and faster blood circulation
compared to red-blooded fish.
14. Which statement about the figure is true?
b. It shows the lineages of icefish that have lost functional
myoglobin
20. Which protein is common in all species of icefish?
b. Antifreeze glycoproteins
20. Which statement about the insect circulatory system is true?
b. Insects have an open circulatory system and a tracheal system
for delivering O2.
9. When an allosterically modulated enzyme is the rate-limiting
enzyme in a metabolic pathway, the entire pathway may be
upregulated or downregulated by allosteric modulation. The
, result of downregulation of the entire pathway is called
a. feedback inhibition.
20. Which statement about the insect circulatory system is true?
b. Insects have an open circulatory system and a tracheal system
for delivering O2.
1. Icefish were once commonly called "bloodless fish" because
of b. the fact that their blood is clear. One unique feature of the
icefish is that they
b. are the only vertebrates that do not have red blood cells as
adults.
3. Which statement about icefish is true?
c. They do not have hemoglobin.
4. When researchers analyzed the DNA of icefish, they found
that the
a. β-globin gene was completely gone and the α-globin gene was
missing parts.
. The hearts of icefishd. can have myoglobin or not, depending
on the species.
6. Which statement regarding icefish evolution is true?
b. Only icefish share an ancestor that lost the function of globin
genes.
