BIO 93 Week 8: Cell Bio Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
34-1 Which of the following C. CDK's become fully active upon binding
statements concerning the cellular a cyclin.
machinery that controls the cell
cycle is false?
A. The concentration of cyclins
change during the cell cycle, while
CDK remains relatively stable.
B. M-cyclin / CDK must be
inactivated before the cell can
complete mitosis.
C. CDK's become fully active upon
binding a cyclin.
D. Both G1-CDK and G1/S-CDK
can
phosphorylate Rb.
E. A major function of active
G1-CDK
is to produce transcription of G1/S-
cyclins.
,34-2 Which of the following E. Their presence is required for the cell to
statements about M-cyclin proteins exit
is false? mitosis.
A. They are degraded via poly-
ubiquitination.
B. They are synthesized during
each
cell cycle.
C. They are present in the cell
during
G2.
D. They activate mitotic CDK.
E. Their presence is required for
the
cell to exit mitosis.
34-3 Which of the following D. They activate mitotic CDK.
statements about CKI proteins is
false?
A. They are degraded via poly-
ubiquitination.
B. They are synthesized during
each
cell cycle.
C. They are essential for the
function
of several checkpoints.
D. They activate mitotic CDK.
, ALS 21 A CDK can be partially E. F F T F
active
in the absence of a cyclin.
2. A CDK becomes fully activated
once bound by a cyclin.
3. A cyclin helps direct a CDK to
its
specific targets.
4. A cyclin must be
phosphorylated
to become active.
A. T F T F
B. F T T T
C. F T F T
D. T T T T
E. F F T F
Answers with Verified Solutions | Latest
Updated 2026
34-1 Which of the following C. CDK's become fully active upon binding
statements concerning the cellular a cyclin.
machinery that controls the cell
cycle is false?
A. The concentration of cyclins
change during the cell cycle, while
CDK remains relatively stable.
B. M-cyclin / CDK must be
inactivated before the cell can
complete mitosis.
C. CDK's become fully active upon
binding a cyclin.
D. Both G1-CDK and G1/S-CDK
can
phosphorylate Rb.
E. A major function of active
G1-CDK
is to produce transcription of G1/S-
cyclins.
,34-2 Which of the following E. Their presence is required for the cell to
statements about M-cyclin proteins exit
is false? mitosis.
A. They are degraded via poly-
ubiquitination.
B. They are synthesized during
each
cell cycle.
C. They are present in the cell
during
G2.
D. They activate mitotic CDK.
E. Their presence is required for
the
cell to exit mitosis.
34-3 Which of the following D. They activate mitotic CDK.
statements about CKI proteins is
false?
A. They are degraded via poly-
ubiquitination.
B. They are synthesized during
each
cell cycle.
C. They are essential for the
function
of several checkpoints.
D. They activate mitotic CDK.
, ALS 21 A CDK can be partially E. F F T F
active
in the absence of a cyclin.
2. A CDK becomes fully activated
once bound by a cyclin.
3. A cyclin helps direct a CDK to
its
specific targets.
4. A cyclin must be
phosphorylated
to become active.
A. T F T F
B. F T T T
C. F T F T
D. T T T T
E. F F T F
