Answer:
<h2>
Phosphorylation and dephosphorylation plays an important role in activating or inhibiting different proteins.</h2>
Explanation:
1. When Cdc25 is phosphorylated by M-Cdk, it activates the CdC25. It acts as checkpoint from G1 to S and G2 to M.
So, the correct answer is activates (A).
2. Phosphorylation of condensins by M-Cdk, degrades the condensin and begins the decondensation of chromosomes. That means it inactivates the condensin.
So, the correct answer is Inactivates (I).
3. Phosphorylation of APC/C activates it and then CdC20 can bind to it and then cell will progress through anaphase.
So, the correct answer is Activation (A).
4. Phosphorylation of Ndc80 by Aurora-B leads to binding of NdC80 to kinetochore and recruits the Ska complex at kinetochore.
So the correct answer is activates (A).
So, four-letter string is AIAA.
<span>They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins.</span>
