Cell Biology Exam 3 Practice Test
Questions with Verified Answers 2025-
2026 Updated.
Which of the following can readily cross the cell plasma membrane without the aid of a
transport protein?
a. K+ d.O2
b. Na+ e. amino acids
c. RNA - Answer D. Oxygen
Transport of glucose by Na+/glucose symport is an example of
a. simple diffusion. d. indirect active transport.
b. facilitated diffusion. e. none of the above.
c. direct active transport. - Answer D. Indirect active transport
A major difference between active transport and facilitated diffusion is that in facilitated
diffusion
a. no proteins are involved.
b. solutes move from high concentration to low concentration.
c. solutes move from low concentration to high concentration.
d. the energy is provided by GTP instead of ATP.
e. none of the above. - Answer B. Solutes move from high concentration to low
concentration
The net outputs of ATP and NADH from fermentation of one molecule of glucose to two
molecules of lactate are _____, and _____, respectively. - Answer 2; 0
The Na+/K+ pump located in the plasma membrane of animal cells actively moves - Answer
Na+ out of and K+ into a cell.
In the aerobic respiration, the position of each electron carrier in the electron transport system
is determined by - Answer Its standard reduction potential
,b. in the mitochondrial outer membrane.
c. in the mitochondrial matrix.
d. in the intermembrane space.
e. in the mitochondrial inner membrane. - Answer C. In the mitochondrial matrix
Which of the following is a feature of the Fluid Mosaic Model of membrane structures?
a. Membranes consist of lipid bilayers that are coated on one side with a thin sheet of proteins
b. Membranes consist of lipid bilayers that are coated on both sides with thin sheets of
proteins.
c. Membranes are in fluid state.
d. All of the above.
e. None of the above. - Answer C. Membranes are in fluid state
Biological membrane asymmetry (the two monolayers are different) can be manifested
by________.
a. the types of lipids present in each monolayer
b. the degree of unsaturation of the fatty acids in the phospholipid molecules
c. movement of each monolayer
d. a and b
e. a and c - Answer D. A and B
Which of the following is NOT a product of the TCA cycle?
a. CO2
d.ATP
b. FADH2
e. pyruvate
c. NADH - Answer Pyruvate
Protein X can be extracted from biological membranes only if the extract buffer contains
,a. active transport.
b. simple diffusion.
c. facilitated diffusion.
d. a and b.
e. a and c. - Answer E. A and C
In the biological systems, hydrogenation reaction
a. is an oxidative reaction.
b. involves removal of electrons.
c. involves removal of protons.
d. all of the above
e. none of the above - Answer e. None of the above
Aerobic respiration involves five stages, and the order of the five stages is
a. Glycolysis , pyruvate oxidation, electron transfer, TCA (tricarboxylic acid) cycle , ATP synthesis
b. Glycolysis, pyruvate oxidation, TCA (tricarboxylic acid) cycle, electron transfer, ATP synthesis
c. Glycolysis , TCA (tricarboxylic acid) cycle, pyruvate oxidation, electron transfer, ATP synthesis
d. Glycolysis, electron transfer, TCA (tricarboxylic acid) cycle, pyruvate oxidation, ATP synthesis
e. TCA (tricarboxylic acid) cycle, glycolysis, electron transfer, pyruvate oxidation, ATP synthesis -
Answer b. Glycolysis, pyruvate oxidation, TCA (tricarboxylic acid) cycle, electron transfer, ATP
synthesis
Which of the following statements is correct for simple diffusion and facilitated diffusion?
a. Both processes have directionality.
b. Both processes can be inhibited by competitive inhibitors.
c. Both processes are membrane-protein mediated.
d. In both processes, solutes move from higher concentration to lower concentration.
e. In both processes, solutes move from low concentration to higher concentration - Answer
, a. use the proton gradient to synthesize ATP.
b. transfer electrons from the reduced coenzymes to oxygen.
c. reduce pyruvate to lactate, and conserve free energy as reduced coenzymes and ATP.
d. oxidize acetyl CoA to CO2, and conserve free energy as reduced coenzymes and ATP
e. oxidize glucose to pyruvate, and conserve free energy as reduced coenzymes and ATP. -
Answer d. oxidize acetyl CoA to CO2, and conserve free energy as reduced coenzymes and
ATP
Biosynthesis of starch occurs in the ___________
a. intermembrane space. d. mitochondria.
b. cytosol. e. nucleus.
c. chloroplast. - Answer Chloroplast
Which of the following statements accurately describes the function of the Calvin cycle?
a. In this process, carbon dioxide is reduced to organic sugars.
b. In this process, NADP+, ADP and Pi are regenerated for the Light reactions
c. In this process, electrons are transferred through electron transfer system
d. a and b
e. a, b and c - Answer d. a and b
_______ and _______ molecules usually can pass through the lipid bilayer via simple diffusion. -
Answer Hydrophobic; small
Which of the following sugar molecules can exit from the Calvin cycle and are used for
carbohydrate synthesis?
a. ribulose1,5-bisphosphate (containing 5 carbons) d. all of the above
b. triose phosphate (containing 3 carbons)
e. none of the above
c. riulose-5-phosphate (containing 5 carbons) - Answer b. triose phosphate (containing 3
carbons)
Questions with Verified Answers 2025-
2026 Updated.
Which of the following can readily cross the cell plasma membrane without the aid of a
transport protein?
a. K+ d.O2
b. Na+ e. amino acids
c. RNA - Answer D. Oxygen
Transport of glucose by Na+/glucose symport is an example of
a. simple diffusion. d. indirect active transport.
b. facilitated diffusion. e. none of the above.
c. direct active transport. - Answer D. Indirect active transport
A major difference between active transport and facilitated diffusion is that in facilitated
diffusion
a. no proteins are involved.
b. solutes move from high concentration to low concentration.
c. solutes move from low concentration to high concentration.
d. the energy is provided by GTP instead of ATP.
e. none of the above. - Answer B. Solutes move from high concentration to low
concentration
The net outputs of ATP and NADH from fermentation of one molecule of glucose to two
molecules of lactate are _____, and _____, respectively. - Answer 2; 0
The Na+/K+ pump located in the plasma membrane of animal cells actively moves - Answer
Na+ out of and K+ into a cell.
In the aerobic respiration, the position of each electron carrier in the electron transport system
is determined by - Answer Its standard reduction potential
,b. in the mitochondrial outer membrane.
c. in the mitochondrial matrix.
d. in the intermembrane space.
e. in the mitochondrial inner membrane. - Answer C. In the mitochondrial matrix
Which of the following is a feature of the Fluid Mosaic Model of membrane structures?
a. Membranes consist of lipid bilayers that are coated on one side with a thin sheet of proteins
b. Membranes consist of lipid bilayers that are coated on both sides with thin sheets of
proteins.
c. Membranes are in fluid state.
d. All of the above.
e. None of the above. - Answer C. Membranes are in fluid state
Biological membrane asymmetry (the two monolayers are different) can be manifested
by________.
a. the types of lipids present in each monolayer
b. the degree of unsaturation of the fatty acids in the phospholipid molecules
c. movement of each monolayer
d. a and b
e. a and c - Answer D. A and B
Which of the following is NOT a product of the TCA cycle?
a. CO2
d.ATP
b. FADH2
e. pyruvate
c. NADH - Answer Pyruvate
Protein X can be extracted from biological membranes only if the extract buffer contains
,a. active transport.
b. simple diffusion.
c. facilitated diffusion.
d. a and b.
e. a and c. - Answer E. A and C
In the biological systems, hydrogenation reaction
a. is an oxidative reaction.
b. involves removal of electrons.
c. involves removal of protons.
d. all of the above
e. none of the above - Answer e. None of the above
Aerobic respiration involves five stages, and the order of the five stages is
a. Glycolysis , pyruvate oxidation, electron transfer, TCA (tricarboxylic acid) cycle , ATP synthesis
b. Glycolysis, pyruvate oxidation, TCA (tricarboxylic acid) cycle, electron transfer, ATP synthesis
c. Glycolysis , TCA (tricarboxylic acid) cycle, pyruvate oxidation, electron transfer, ATP synthesis
d. Glycolysis, electron transfer, TCA (tricarboxylic acid) cycle, pyruvate oxidation, ATP synthesis
e. TCA (tricarboxylic acid) cycle, glycolysis, electron transfer, pyruvate oxidation, ATP synthesis -
Answer b. Glycolysis, pyruvate oxidation, TCA (tricarboxylic acid) cycle, electron transfer, ATP
synthesis
Which of the following statements is correct for simple diffusion and facilitated diffusion?
a. Both processes have directionality.
b. Both processes can be inhibited by competitive inhibitors.
c. Both processes are membrane-protein mediated.
d. In both processes, solutes move from higher concentration to lower concentration.
e. In both processes, solutes move from low concentration to higher concentration - Answer
, a. use the proton gradient to synthesize ATP.
b. transfer electrons from the reduced coenzymes to oxygen.
c. reduce pyruvate to lactate, and conserve free energy as reduced coenzymes and ATP.
d. oxidize acetyl CoA to CO2, and conserve free energy as reduced coenzymes and ATP
e. oxidize glucose to pyruvate, and conserve free energy as reduced coenzymes and ATP. -
Answer d. oxidize acetyl CoA to CO2, and conserve free energy as reduced coenzymes and
ATP
Biosynthesis of starch occurs in the ___________
a. intermembrane space. d. mitochondria.
b. cytosol. e. nucleus.
c. chloroplast. - Answer Chloroplast
Which of the following statements accurately describes the function of the Calvin cycle?
a. In this process, carbon dioxide is reduced to organic sugars.
b. In this process, NADP+, ADP and Pi are regenerated for the Light reactions
c. In this process, electrons are transferred through electron transfer system
d. a and b
e. a, b and c - Answer d. a and b
_______ and _______ molecules usually can pass through the lipid bilayer via simple diffusion. -
Answer Hydrophobic; small
Which of the following sugar molecules can exit from the Calvin cycle and are used for
carbohydrate synthesis?
a. ribulose1,5-bisphosphate (containing 5 carbons) d. all of the above
b. triose phosphate (containing 3 carbons)
e. none of the above
c. riulose-5-phosphate (containing 5 carbons) - Answer b. triose phosphate (containing 3
carbons)
