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mina [271]
3 years ago
15

Neither whales nor pythons have hind legs, but both have internal remnants of legs and hip bones. Snakes and whales must have I.

evolved from ancestors that walked. II. developed morphological adaptations for transportation. III. had their legs bitten off by their mothers at birth.
Biology
1 answer:
alexandr402 [8]3 years ago
4 0

Answer:

I. evolved from ancestors that walked

Explanation:

Whales and pythons have vestigial structures, which are structures (hind legs) which are no longer useful to them since they have evolved. The ancestors of the whale and python did use the hind legs but over generations the whale and snake have adapted to new environments and they no longer need them.

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If you were to expose cells that are undergoing aerobic cellular respiration to a radioactive oxygen isotope in the form of O2,
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Why can't both strands of DNA be replicated at the same time?
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Answer: DNA is a molecule made up of two strands, twisted around each other in a double helix shape. The two strands are complementary which have a 5 prime end and a 3 prime end. To understand this question you must first understand the steps that follow.

DNA Replication:

<u>Step one: </u>

DNA Helicase (unzips) separates the strands.

<u>Step two:</u>

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<u>Step three:</u>

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  • The leading strand is made continuously.
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<u>Step four:</u>

Once the new DNA is complete the enzyme exonuclease removes all the RNA primers from both strands of DNA.

<u>Step five:</u>

Another DNA Polymerase fills in the gaps that are left behind with DNA.

<u>Step six:</u>

DNA Ligase seals up the fragments in DNA, in both strands to make a continuous double strand.

<u>Final answer:</u>

DNA Replication cannot replicate at the same time due to the leading and lagging strand.

Good luck!

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