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Alenkasestr [34]
3 years ago
13

Please help i will mark brainly!

Biology
1 answer:
madreJ [45]3 years ago
7 0
5 ........................
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The role that p53 protein plays in suppressing inappropriate progression through the cell cycle depends on all of the following
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a. p53 activates transcription of WAF1.

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In rest of the mentioned options, p53 plays a role directly or indirectly. During double stranded lesion in DNA in G1 phase, a sensor protein known as ATM binds the DNA lesion site. ATM is a serine/threonine kinase which phosphorylates another kinase known as chk2. After phosphorylation,<u> chk2 stabilizes transcription factor p53.</u> p53 further acts as a transcription factor for the synthesis of a protein known as p21 which inhibits G1 phase specific CDK and ultimately cell is arrested in G1 phase. The cell remains in arrested state until the DNA lesion is fully repaired. <u>Hence, p53 indirectly blocks G1 to S transition with the help of p21. </u>

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