CELL BIOLOGY 112 EXAM 3 PCC 2025/2026
WITH ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|CURRENTLY TESTING QUESTIONS AND
SOLUTIONS|ALREADY GRADED
A+|NEWEST|BRAND NEW VERSION
!!|GUARANTEED PASS
The type A bacteria were isolated from a hot spring where the temperature is around 95C, and
the type B bacteria were isolated from soil where the temperature is in the range of 10C-30C.
The G-C content in the genome of
the type A bacteria should be ________________ that in the genome of the type B bacteria.
higher than
What is chromatin that remains compacted during interphase called?
A) granular chromatin
B) euchromatin
C) anabolic chromatin
D) heterochromatin
E) homochromatin
D. heterochromatin
Which of the following statements is (or are) correct about the nucleolus?
A. There may be more than one nucleoli in the nucleus.
B. The nucleolus is the site where the ribosome subunits are assembled.
C. The nucleolus is wrapped by one membrane.
D. Both A) and B).
E. Both B) and C).
D. Both A and B
1|Page
,Which of the following activities is not normally supported by the nuclear pores in a eukaryotic
cell?
A. Export the ribosome subunits out of the nucleus.
B. Export the tRNAs out of the nucleus.
C. Export the mRNAs out of the nucleus.
D. Export the proteins required for transcription out of the nucleus.
E. All of the above.
D. Export the proteins required for transcription out of the nucleus
Which of the following statement is NOT correct concerning DNA replication?
A. Synthesis at each replication fork is continuous in the direction of fork movement for the
leading strand, but discontinuous in the opposite direction for the lagging strand.
B. The discontinuous synthesis of DNA involves short intermediates called Okazaki fragments.
C. The Okazaki fragments in DNA replication are synthesized in the 3' -> 5' .
D. The matured Okazaki fragments are joined together by DNA ligase
E. None of the above.
C. The Okazaki fragments in DNA replication are synthesized in the 3' -> 5'
During mitosis, the chromosomes are separated by mitotic spindle, which is largely composed
of
A) microtubules
B) microfilaments.
C) intermediate filaments.
D) DNAs
E) RNAs.
A. microtubules
Cytokinesis divides
A. cellular proteins .
B. cellular DNAs.
C. cellular RNAs.
D. the cytoplasm.
E. cellular DNA, RNA and proteins.
D. the cytoplasm
2|Page
,Approximately what percentage of the human genome sequence represents protein coding
sequence.
A) around 2%
B) around 50%
C) around 60%
D) around 70%
E) virtually 100%
A. around 2%
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
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.
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.
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.
2; 0
The Na+/K+ pump located in the plasma membrane of animal cells actively moves
Na+ out of and K+ into a cell.
3|Page
, In the aerobic respiration, the position of each electron carrier in the electron transport system
is determined by
Its standard reduction potential
During aerobic respiration, the TCA cycle occurs:
a. in the cytosol.
b. in the mitochondrial outer membrane.
c. in the mitochondrial matrix.
d. in the intermembrane space.
e. in the mitochondrial inner membrane.
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.
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
D. A and B
Which of the following is NOT a product of the TCA cycle?
a. CO2
d.ATP
b. FADH2
4|Page
WITH ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|CURRENTLY TESTING QUESTIONS AND
SOLUTIONS|ALREADY GRADED
A+|NEWEST|BRAND NEW VERSION
!!|GUARANTEED PASS
The type A bacteria were isolated from a hot spring where the temperature is around 95C, and
the type B bacteria were isolated from soil where the temperature is in the range of 10C-30C.
The G-C content in the genome of
the type A bacteria should be ________________ that in the genome of the type B bacteria.
higher than
What is chromatin that remains compacted during interphase called?
A) granular chromatin
B) euchromatin
C) anabolic chromatin
D) heterochromatin
E) homochromatin
D. heterochromatin
Which of the following statements is (or are) correct about the nucleolus?
A. There may be more than one nucleoli in the nucleus.
B. The nucleolus is the site where the ribosome subunits are assembled.
C. The nucleolus is wrapped by one membrane.
D. Both A) and B).
E. Both B) and C).
D. Both A and B
1|Page
,Which of the following activities is not normally supported by the nuclear pores in a eukaryotic
cell?
A. Export the ribosome subunits out of the nucleus.
B. Export the tRNAs out of the nucleus.
C. Export the mRNAs out of the nucleus.
D. Export the proteins required for transcription out of the nucleus.
E. All of the above.
D. Export the proteins required for transcription out of the nucleus
Which of the following statement is NOT correct concerning DNA replication?
A. Synthesis at each replication fork is continuous in the direction of fork movement for the
leading strand, but discontinuous in the opposite direction for the lagging strand.
B. The discontinuous synthesis of DNA involves short intermediates called Okazaki fragments.
C. The Okazaki fragments in DNA replication are synthesized in the 3' -> 5' .
D. The matured Okazaki fragments are joined together by DNA ligase
E. None of the above.
C. The Okazaki fragments in DNA replication are synthesized in the 3' -> 5'
During mitosis, the chromosomes are separated by mitotic spindle, which is largely composed
of
A) microtubules
B) microfilaments.
C) intermediate filaments.
D) DNAs
E) RNAs.
A. microtubules
Cytokinesis divides
A. cellular proteins .
B. cellular DNAs.
C. cellular RNAs.
D. the cytoplasm.
E. cellular DNA, RNA and proteins.
D. the cytoplasm
2|Page
,Approximately what percentage of the human genome sequence represents protein coding
sequence.
A) around 2%
B) around 50%
C) around 60%
D) around 70%
E) virtually 100%
A. around 2%
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
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.
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.
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.
2; 0
The Na+/K+ pump located in the plasma membrane of animal cells actively moves
Na+ out of and K+ into a cell.
3|Page
, In the aerobic respiration, the position of each electron carrier in the electron transport system
is determined by
Its standard reduction potential
During aerobic respiration, the TCA cycle occurs:
a. in the cytosol.
b. in the mitochondrial outer membrane.
c. in the mitochondrial matrix.
d. in the intermembrane space.
e. in the mitochondrial inner membrane.
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.
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
D. A and B
Which of the following is NOT a product of the TCA cycle?
a. CO2
d.ATP
b. FADH2
4|Page
