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Colt1911 [192]
3 years ago
13

Some structures, like the leg bones in the modern day whale, no longer have a useful

Biology
1 answer:
Vlad1618 [11]3 years ago
4 0
Both the pelvis and femur of a whale are called vestigial structures! Another example of this is a human’s tail bone. Hope this helped!
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he burning of coal, a fossil fuel, produces water and carbon dioxide. How is this similar to cellular respiration? A) Both requi
MariettaO [177]
Hello There!

Now, i'm not 100% sure on this but i think it is C. 

Please let me know if it is correct..i'm sorry if it is wrong.

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8 0
3 years ago
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The role that p53 protein plays in suppressing inappropriate progression through the cell cycle depends on all of the following
irinina [24]

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>

5 0
3 years ago
What is the difference between open and closed populations?
Ahat [919]

Answer:

Open populations occur when the total population is dynamic, with new members leaving and being added over time. ... Closed populations occur when the members of population are fixed and no new members are added or lost from the group (except through birth and death

Explanation:

hope this helps also dont fprget to thank me

3 0
3 years ago
When making a circle graph what angle represents 20%
Hitman42 [59]

Answer:

The central angle is 20% of 360°, that is

central angle = \frac{20}{100}

100

20

× 360° = 0.2 × 360° = 72° → C

5 0
2 years ago
What molecules make up proteins?
irga5000 [103]

Answer:

carbon hydrogen oxygen nitrogen

5 0
3 years ago
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