Biologists do not fully understand DNA because there are constant changes and new discoveries developing.
Answer:
a. p53 activates transcription of WAF1.
Explanation:
<u>WAF1 transcription occurs independent of p53 during oxidative stress so p53 does not play any role in cell cycle arrest in the signaling pathway which involves WAF1 . </u>
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>
As such <u>WAF1 transcription factor involving pathway</u><u> </u><u>also requires p21 protein for causing cell cycle arrest but in this pathway p21 is not synthesized with the help of p53. </u>
Answer: 1, 2, 5 is the correct answer
Hello 2020 ;)
Explanation:
Answer:
<em>A) The water is cooler than the land and the wind blows towards the beach</em>
Explanation:
<em>During summer hot day, the land and ocean both get heated. But since the specific heat capacity of water is higher than the land , it takes longer time for ocean to heat up than the land. Since during day land is warmer than ocean, hence the air above it also gets warm and rises away. While the air over ocean is comparatively cooler than the air above on land and hence it sinks down and starts moving towards the land thereby causing sea breeze.</em>
<u><em>Hope this helps!</em></u>
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