BIOL 212: Exam 1 & 2 Questions and
Answers
After the breakdown of RBCs, iron is transported in the blood by which plasma protein?
Select one:
a. ferritin
b. bilirubin
c. hemoglobin
d. fibrinogen
e. transferrin - Correct Answers -E. transferrin
The end products of the Krebs cycle include all of the following except:
Select one:
a. CO2
b. ATP
c. FADH2
d. pyruvate
e. NADH - Correct Answers -D. pyruvate
Which of the following statements about anaerobic metabolism is FALSE?
Select one:
a. Oxygen is limited or absent.
b. Pyruvate moves into the mitochondrion but then accumulates there, since the Krebs
cycle does not occur.
c. Most of the energy of the glucose molecule remains in the chemical bonds of the
carbon molecule.
d. The electron transport chain does not occur since oxygen is needed as the final
electron acceptor. - Correct Answers -B. Pyruvate moves into the mitochondrion but
then accumulates there, since the Krebs cycle does not occur.
Following an increase in body temperature, which of the following responses will NOT
occur?
Select one:
a. an increase in skin blood flow
b. an increase in skin temperature
,c. an increase in nonshivering thermogenesis
d. an increase in sweat production
e. an increase in evaporation from the skin - Correct Answers -C. an increase in
nonshivering thermogenesis
________________ are adhering junctions that anchor cells together in tissues subject
to considerable stretching.
Select one:
a. gap junctions
b. tight junctions
c. collagen junctions
d. desmosome junctions - Correct Answers -D. desmosome junctions
Given that oubain blocks the Na+/K+ pump, how would this drug affect glucose
transport in the small intestine?
Select one:
a. Compared to normal, more glucose would be absorbed from the lumen of the small
intestine.
b. Compared to normal, less glucose would be absorbed from the lumen of the small
intestine.
c. Glucose absorption would not change, since the Na+/K+ pump is different from the
glucose transporter in the luminal membrane. - Correct Answers -B. Compared to
normal, less glucose would be absorbed from the lumen of the small intestine.
GIVEN: The intracellular concentration of calcium ions is 2 x 10-4 mM and the
extracellular concentration of calcium is 5.0 mM. In the secondary active transport of
calcium using a sodium/calcium transporter, calcium will:
Select one:
a. passively move into the cell as Na+ is actively moved out of the cell
b. passively move out of the cell as Na+ is actively moved out of the cell
c. actively move out of the cell as Na+ passively moves into the cell
d. actively move into the cell as Na+ passively moves into the cell - Correct Answers -C.
actively move out of the cell as Na+ passively moves into the cell
Midway through a 5-mile workout a runner begins to sweat profusely. In the feedback
loop for temperature regulation, the sweat glands producing the sweat would be
considered the:
Select one:
a. integrating center
b. receptor
c. stimulus
d. effector - Correct Answers -D. effector
, Which of the following is FALSE about glucose uptake in the small intestine?
Select one:
a. Glucose moves into the blood by facilitated diffusion.
b. SGLT uses phosphorylation in order to increase its affinity for glucose.
c. The movement of glucose across the luminal membrane is driven by an ion
concentration gradient.
d. The sodium-potassium pump keeps the ICF Na+ concentration lower than the luminal
Na+concentration. - Correct Answers -B. SGLT uses phosphorylation in order to
increase its affinity for glucose.
A scientist is studying the passive movement of chemicals into a cell. He measures the
rate at which two chemicals diffuse into a cell, as a function of their external
concentration. Chemical A's diffusion is directly proportional to the extracellular
concentration but eventually reaches a transport maximum, while Chemical B's rate of
transport continues to be directly proportional to external concentration.
How can one explain the differences in these diffusion rates?
Select one:
a. Chemical A must be nonpolar, while Chemical B must be polar.
b. Chemical A is moving by secondary active transport, whereas Chemical B is moving
by primary active transport.
c. Chemical A is moving by facilitated diffusion, while Chemical B is diffusing through
the phospholipids or through a channel.
d. More than one of the above is a possible explanation for this scientist's results. -
Correct Answers -C. Chemical A is moving by facilitated diffusion, while Chemical B is
diffusing through the phospholipids or through a channel.
Homeostasis refers to maintaining a relatively stable internal environment. The "internal
environment" is:
Select one:
a. the blood cells
b. body parts beneath the skin
c. the cytoplasm of all cells in the body
d. the intracellular fluid in the body
e. the extracellular fluid in the body - Correct Answers -E. the extracellular fluid in the
body
The sodium ion (Na+) becomes more hydrated than the potassium ion (K+) because:
Select one:
a. the potassium ion has a greater density of surface charge
b. the sodium ion has more protons and has a larger nucleus
c. the sodium ion has a greater density of surface charge
Answers
After the breakdown of RBCs, iron is transported in the blood by which plasma protein?
Select one:
a. ferritin
b. bilirubin
c. hemoglobin
d. fibrinogen
e. transferrin - Correct Answers -E. transferrin
The end products of the Krebs cycle include all of the following except:
Select one:
a. CO2
b. ATP
c. FADH2
d. pyruvate
e. NADH - Correct Answers -D. pyruvate
Which of the following statements about anaerobic metabolism is FALSE?
Select one:
a. Oxygen is limited or absent.
b. Pyruvate moves into the mitochondrion but then accumulates there, since the Krebs
cycle does not occur.
c. Most of the energy of the glucose molecule remains in the chemical bonds of the
carbon molecule.
d. The electron transport chain does not occur since oxygen is needed as the final
electron acceptor. - Correct Answers -B. Pyruvate moves into the mitochondrion but
then accumulates there, since the Krebs cycle does not occur.
Following an increase in body temperature, which of the following responses will NOT
occur?
Select one:
a. an increase in skin blood flow
b. an increase in skin temperature
,c. an increase in nonshivering thermogenesis
d. an increase in sweat production
e. an increase in evaporation from the skin - Correct Answers -C. an increase in
nonshivering thermogenesis
________________ are adhering junctions that anchor cells together in tissues subject
to considerable stretching.
Select one:
a. gap junctions
b. tight junctions
c. collagen junctions
d. desmosome junctions - Correct Answers -D. desmosome junctions
Given that oubain blocks the Na+/K+ pump, how would this drug affect glucose
transport in the small intestine?
Select one:
a. Compared to normal, more glucose would be absorbed from the lumen of the small
intestine.
b. Compared to normal, less glucose would be absorbed from the lumen of the small
intestine.
c. Glucose absorption would not change, since the Na+/K+ pump is different from the
glucose transporter in the luminal membrane. - Correct Answers -B. Compared to
normal, less glucose would be absorbed from the lumen of the small intestine.
GIVEN: The intracellular concentration of calcium ions is 2 x 10-4 mM and the
extracellular concentration of calcium is 5.0 mM. In the secondary active transport of
calcium using a sodium/calcium transporter, calcium will:
Select one:
a. passively move into the cell as Na+ is actively moved out of the cell
b. passively move out of the cell as Na+ is actively moved out of the cell
c. actively move out of the cell as Na+ passively moves into the cell
d. actively move into the cell as Na+ passively moves into the cell - Correct Answers -C.
actively move out of the cell as Na+ passively moves into the cell
Midway through a 5-mile workout a runner begins to sweat profusely. In the feedback
loop for temperature regulation, the sweat glands producing the sweat would be
considered the:
Select one:
a. integrating center
b. receptor
c. stimulus
d. effector - Correct Answers -D. effector
, Which of the following is FALSE about glucose uptake in the small intestine?
Select one:
a. Glucose moves into the blood by facilitated diffusion.
b. SGLT uses phosphorylation in order to increase its affinity for glucose.
c. The movement of glucose across the luminal membrane is driven by an ion
concentration gradient.
d. The sodium-potassium pump keeps the ICF Na+ concentration lower than the luminal
Na+concentration. - Correct Answers -B. SGLT uses phosphorylation in order to
increase its affinity for glucose.
A scientist is studying the passive movement of chemicals into a cell. He measures the
rate at which two chemicals diffuse into a cell, as a function of their external
concentration. Chemical A's diffusion is directly proportional to the extracellular
concentration but eventually reaches a transport maximum, while Chemical B's rate of
transport continues to be directly proportional to external concentration.
How can one explain the differences in these diffusion rates?
Select one:
a. Chemical A must be nonpolar, while Chemical B must be polar.
b. Chemical A is moving by secondary active transport, whereas Chemical B is moving
by primary active transport.
c. Chemical A is moving by facilitated diffusion, while Chemical B is diffusing through
the phospholipids or through a channel.
d. More than one of the above is a possible explanation for this scientist's results. -
Correct Answers -C. Chemical A is moving by facilitated diffusion, while Chemical B is
diffusing through the phospholipids or through a channel.
Homeostasis refers to maintaining a relatively stable internal environment. The "internal
environment" is:
Select one:
a. the blood cells
b. body parts beneath the skin
c. the cytoplasm of all cells in the body
d. the intracellular fluid in the body
e. the extracellular fluid in the body - Correct Answers -E. the extracellular fluid in the
body
The sodium ion (Na+) becomes more hydrated than the potassium ion (K+) because:
Select one:
a. the potassium ion has a greater density of surface charge
b. the sodium ion has more protons and has a larger nucleus
c. the sodium ion has a greater density of surface charge
