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When cell has stalled DNA replication fork,which checkpoint should be predominantly activated?

(a) G1 / S

(b) G2 / M

(c) M

(d) Both G2 / M and M

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Correct option (a) G1 / S

Explanation :

Stalled forks activate checkpoint signaling and pause replication. Since, G1/S checkpoint checks  DNA damage, cells size prior to S-phase (i.e. DNA replication phase). This checkpoint would be activated by stalled DNA replication fork.

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