A mutant strain of yeast possesses a mutation in the nda2 gene, resulting in no

Question

A mutant strain of yeast possesses a mutation in the nda2 gene, resulting in no production of a1 tubulin. As a result, these cells would most likely
A) not duplicate their chromosomes.
B) not enter M phase.
C) not enter S phase.
D) keep the nuclear membrane intact.
E) have little or no spindle formation.


In order to be active, a Cdc-cyclin needs to be
A) singly phosphorylated.
B) acetylated.
C) doubly phosphorylated.
D) doubly methylated.
E) cleaved by proteases.

The phase of the cell cycle that varies most in duration in various cell types is
A) M.
B) G1.
C) S.
D) G2.
E) both choices A and B

In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450 - protease pathway.
B) cyclin proteolysis pathway.
C) ubiquitin-proteosome pathway.
D) kinase inhibition pathway.
E) none of the above

Phosphorylation of ________ is required for chromosome condensation.
A) condensin
B) cyclin
C) DNA gyrase
D) topoisomerase II
E) both choices A and B

Explanation / Answer

A mutant strain of yeast possesses a mutation in the nda2 gene, resulting in no production of a1 tubulin. As a result, these cells would most likely
A) not duplicate their chromosomes.
B) not enter M phase.
C) not enter S phase.
D) keep the nuclear membrane intact.
E) have little or no spindle formation.


In order to be active, a Cdc-cyclin needs to be
A) singly phosphorylated.
B) acetylated.
C) doubly phosphorylated.
D) doubly methylated.
E) cleaved by proteases.

The phase of the cell cycle that varies most in duration in various cell types is
A) M.
B) G1.
C) S.
D) G2.
E) both choices A and B

In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450 - protease pathway.
B) cyclin proteolysis pathway.
C) ubiquitin-proteosome pathway.
D) kinase inhibition pathway.
E) none of the above

Phosphorylation of ________ is required for chromosome condensation.
A) condensin
B) cyclin
C) DNA gyrase
D) topoisomerase II
E) both choices A and B

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