BIOLOGY 151 QUIZ QUESTIONS WITH
CORRECT ANSWERS
Which of following molecules would move the most quickly across a plasma membrane
that doesn't have transport proteins?
a. Ca^2+
b. N2 (nitrogen gas)
c. SO2 (sulfur dioxide)
d. C6H12O6 (fructose) - Correct Answers -b. N2 (nitrogen gas)
Use the receptor kinase pathway diagram to answer this question. What is the
immediate next step after TK2 is phosphorylated by TK1?
a. RNA polymerase begins transcription.
b. The receptor adds a phosphate group to TK1.
c. A signal binds to the receptor.
d. The receptor dimerizes (pairs together) and activates.
e. TK2 phosphorylates the transcription factor. - Correct Answers -e. TK2
phosphorylates the transcription factor
Select true or false for each of the following statements about pluripotent stem cells.
1. Unable to differentiate any further
2. Capable of dividing and renewing
3. Specialized to perform specific functions in the body
4. Can become many different types of cells - Correct Answers -1. False
2. True
3. False
4. True
Use the receptor kinase pathway diagram AND these results to answer this question
Analysis of a cell with a simple kinase pathway shows the following:
-The receptors are absent.
-TK1 molecules are not phosphorylated.
-Some TK2 molecules are phosphorylated and others are not.
-TFa molecules are all phosophorylated.
Which of the following scenarios could explain these results?
a. TFa could have activated a gene that encodes a phosphatase that targets TK2.
b. A loss-of-function mutation for TK2 (meaning that TK2 is not able to function).
c. TFa could have activated a gene that encodes a kinase that targets TK1.
, d. Receptor-mediated endocytosis has occurred. - Correct Answers -d. Receptor-
mediated endocytosis has occurred
Which of the following best describe both stem cells AND terminally differentiated
(adult) cells?
a. They have receptors on their cell surface.
b. They express genes (transcription and translation).
c. They have the potential to become several different cell types.
d. A & B
e. A, B, & C - Correct Answers -d. A & B
In the kidney, glucose transport across the membrane is a two-step process. The first
step is the sodium-potassium pump. The second step uses the Na+ electrochemical
gradient to move glucose into the cell. Which part of this process uses ATP directly?
a. Moving glucose out of the cell
b. Moving glucose into the cell
c. Moving Na+ out of the cell
d. Moving Na+ into the cell - Correct Answers -c. Moving Na+ out of the cell
The Na+/K+ pump creates an electrochemical gradient by using ______ to move Na+
ions _________ their concentration gradient. - Correct Answers -ATP, against
Which of the following statements regarding primary active transport is false?
a. Primary active transport requires the cell to spend energy
b. Primary active transport can move molecules up their concentration gradient
c. Primary active transport is directly powered by a concentration gradient
d. Primary active transport uses ATP as an energy source - Correct Answers -c.
Primary active transport is directly powered by a concentration gradient
You are studying how molecule X is transported into lung epithelial cells. You determine
the rate of movement across the plasma membrane under a variety of conditions and
make the following observations:
-Molecule X still moves into the cells when the intracellular concentration is higher than
the extracellular concentration.
-If you deplete ATP levels in the cell, then molecule X is not transported.
-When you alter the concentrations of other molecules, like Na+ or K+, this does not
have an impact on the rate of transport of molecule X.
The mechanism used to get molecule X into lung epithelial cells is:
a. simple diffusion.
b. primary active transport.
c. facilitated diffusion. - Correct Answers -b. Primary active transport
Phosphorylation and dephosphorylation play important roles in cell signaling. Select true
or false for each of the following statements about phosphorylation and
dephosphorylation.
1. Phosphatases add phosphate groups to proteins
CORRECT ANSWERS
Which of following molecules would move the most quickly across a plasma membrane
that doesn't have transport proteins?
a. Ca^2+
b. N2 (nitrogen gas)
c. SO2 (sulfur dioxide)
d. C6H12O6 (fructose) - Correct Answers -b. N2 (nitrogen gas)
Use the receptor kinase pathway diagram to answer this question. What is the
immediate next step after TK2 is phosphorylated by TK1?
a. RNA polymerase begins transcription.
b. The receptor adds a phosphate group to TK1.
c. A signal binds to the receptor.
d. The receptor dimerizes (pairs together) and activates.
e. TK2 phosphorylates the transcription factor. - Correct Answers -e. TK2
phosphorylates the transcription factor
Select true or false for each of the following statements about pluripotent stem cells.
1. Unable to differentiate any further
2. Capable of dividing and renewing
3. Specialized to perform specific functions in the body
4. Can become many different types of cells - Correct Answers -1. False
2. True
3. False
4. True
Use the receptor kinase pathway diagram AND these results to answer this question
Analysis of a cell with a simple kinase pathway shows the following:
-The receptors are absent.
-TK1 molecules are not phosphorylated.
-Some TK2 molecules are phosphorylated and others are not.
-TFa molecules are all phosophorylated.
Which of the following scenarios could explain these results?
a. TFa could have activated a gene that encodes a phosphatase that targets TK2.
b. A loss-of-function mutation for TK2 (meaning that TK2 is not able to function).
c. TFa could have activated a gene that encodes a kinase that targets TK1.
, d. Receptor-mediated endocytosis has occurred. - Correct Answers -d. Receptor-
mediated endocytosis has occurred
Which of the following best describe both stem cells AND terminally differentiated
(adult) cells?
a. They have receptors on their cell surface.
b. They express genes (transcription and translation).
c. They have the potential to become several different cell types.
d. A & B
e. A, B, & C - Correct Answers -d. A & B
In the kidney, glucose transport across the membrane is a two-step process. The first
step is the sodium-potassium pump. The second step uses the Na+ electrochemical
gradient to move glucose into the cell. Which part of this process uses ATP directly?
a. Moving glucose out of the cell
b. Moving glucose into the cell
c. Moving Na+ out of the cell
d. Moving Na+ into the cell - Correct Answers -c. Moving Na+ out of the cell
The Na+/K+ pump creates an electrochemical gradient by using ______ to move Na+
ions _________ their concentration gradient. - Correct Answers -ATP, against
Which of the following statements regarding primary active transport is false?
a. Primary active transport requires the cell to spend energy
b. Primary active transport can move molecules up their concentration gradient
c. Primary active transport is directly powered by a concentration gradient
d. Primary active transport uses ATP as an energy source - Correct Answers -c.
Primary active transport is directly powered by a concentration gradient
You are studying how molecule X is transported into lung epithelial cells. You determine
the rate of movement across the plasma membrane under a variety of conditions and
make the following observations:
-Molecule X still moves into the cells when the intracellular concentration is higher than
the extracellular concentration.
-If you deplete ATP levels in the cell, then molecule X is not transported.
-When you alter the concentrations of other molecules, like Na+ or K+, this does not
have an impact on the rate of transport of molecule X.
The mechanism used to get molecule X into lung epithelial cells is:
a. simple diffusion.
b. primary active transport.
c. facilitated diffusion. - Correct Answers -b. Primary active transport
Phosphorylation and dephosphorylation play important roles in cell signaling. Select true
or false for each of the following statements about phosphorylation and
dephosphorylation.
1. Phosphatases add phosphate groups to proteins
