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MMSC490 Exam 3 Questions and Correct
Answers/ Latest Update / Already Graded
The length of time it takes for the cells labeled during DNA synthesis
to begin to enter mitosis
is a good estimate of the length of the _______ phase(s).
a. G1
b. S
c. G2
d. M
Ans: c. G2
In a typical cycling mammalian cell, _______ of the cell cycle is spent in
interphase.
a. 99%
b. 95%
c. 75%
d. 50%
Ans: b. 95%
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The number of cells in the different phases of a population can be
determined most easily by
using a(n) _______ to measure the amount of DNA per cell in a large
sample of cells.
a. scintillation counter
b. flow cytometer
c. fluorescence microscope
d. phase-contrast microscope after autoradiography
Ans: b. flow cytometer
Which of the following represents the amount of DNA in a typical G2
cell?
a. n
b. 2n
c. 4n
d. 8n
Ans: c. 4n
The G1 checkpoint in budding yeast cells is called
a. START
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b. the restriction point
c. the decision point
d. the G1/S boundary
Ans: a. START
The G1 checkpoint in animal cells is called
a. START
b. the restriction point
c. the decision point
d. the G1/S boundary
Ans: b. the restriction point
Skin fibroblasts arrested in G0 are stimulated near a wound to enter G1
by _______ growth
factor.
a. epidermal
b. fibroblast
c. platelet-derived
d. keratinocyte
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Ans: c. platelet-derived
The G2 checkpoint prevents entry into _______ if _______.
a. G1; DNA synthesis is not complete and/or DNA is damaged
b. S; DNA synthesis is not complete and/or DNA is damaged
c. G2; DNA synthesis is not complete and/or DNA is damaged
d. M; DNA synthesis is not complete and/or DNA is damaged
Ans: d. M; DNA synthesis is not complete and/or DNA is
damaged
MPF is a:
a. monomeric protein kinase
b. dimer of two molecules of Cdk1
c. dimer of Cdk1 and cyclin A
d. dimer of Cdk1 and cyclin B
Ans: d. dimer of Cdk1 and cyclin B
MPF is a general regulator of the transition from
a. G1 to S
b. S to G2
All rights reserved © 2025/ 2026 |
MMSC490 Exam 3 Questions and Correct
Answers/ Latest Update / Already Graded
The length of time it takes for the cells labeled during DNA synthesis
to begin to enter mitosis
is a good estimate of the length of the _______ phase(s).
a. G1
b. S
c. G2
d. M
Ans: c. G2
In a typical cycling mammalian cell, _______ of the cell cycle is spent in
interphase.
a. 99%
b. 95%
c. 75%
d. 50%
Ans: b. 95%
All rights reserved © 2025/ 2026 |
, Page |2
The number of cells in the different phases of a population can be
determined most easily by
using a(n) _______ to measure the amount of DNA per cell in a large
sample of cells.
a. scintillation counter
b. flow cytometer
c. fluorescence microscope
d. phase-contrast microscope after autoradiography
Ans: b. flow cytometer
Which of the following represents the amount of DNA in a typical G2
cell?
a. n
b. 2n
c. 4n
d. 8n
Ans: c. 4n
The G1 checkpoint in budding yeast cells is called
a. START
All rights reserved © 2025/ 2026 |
, Page |3
b. the restriction point
c. the decision point
d. the G1/S boundary
Ans: a. START
The G1 checkpoint in animal cells is called
a. START
b. the restriction point
c. the decision point
d. the G1/S boundary
Ans: b. the restriction point
Skin fibroblasts arrested in G0 are stimulated near a wound to enter G1
by _______ growth
factor.
a. epidermal
b. fibroblast
c. platelet-derived
d. keratinocyte
All rights reserved © 2025/ 2026 |
, Page |4
Ans: c. platelet-derived
The G2 checkpoint prevents entry into _______ if _______.
a. G1; DNA synthesis is not complete and/or DNA is damaged
b. S; DNA synthesis is not complete and/or DNA is damaged
c. G2; DNA synthesis is not complete and/or DNA is damaged
d. M; DNA synthesis is not complete and/or DNA is damaged
Ans: d. M; DNA synthesis is not complete and/or DNA is
damaged
MPF is a:
a. monomeric protein kinase
b. dimer of two molecules of Cdk1
c. dimer of Cdk1 and cyclin A
d. dimer of Cdk1 and cyclin B
Ans: d. dimer of Cdk1 and cyclin B
MPF is a general regulator of the transition from
a. G1 to S
b. S to G2
All rights reserved © 2025/ 2026 |
