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Kruka [31]
3 years ago
7

Which of the following best describes the difference between a plant cell and an animal cell?

Biology
1 answer:
Nadya [2.5K]3 years ago
7 0
The answer to the question is b
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#15. what is the end-replication problem? why, in the absence of telomerase, do the ends of the linear chromosomes get progressi
noname [10]

The DNA replication by the action of DNA polymerase takes place in the 3' to 5' direction on the leading strand. The lagging strand which has the opposite orientation or polarity as that of the leading strand requires a more time to get synthesised. The DNA replication of the lagging strand happens in short segments where a RNA primer forms a compliment with a part of the DNA segment on its 3' end. This RNA primer helps initiate the replication of the Okazaki fragments. When the replication on the lagging strand reaches its end, the RNA primer forms a compliment with the last bit of the strand. This small segment gets missed in the end as no more DNA is left to form a RNA primer-DNA compliment. Such shortening of the lagging strand in the replication process is the end-replication problem.

Telomeres are protective ends of the DNA strands. These ends contain a poly-A tail. When the lagging strand replication reaches its end, the RNA primer forms a compliment with the telomere and initiates the replication. This leads to the shortening of the telomere and not the coding segments on the lagging strand of DNA. The telomerase repairs the shortened telomere by re-synthesising it.

7 0
3 years ago
How much of earth's atmosphere is oxygen
lora16 [44]
Answer- 21 percent : )
7 0
3 years ago
The C. elegans genome is about 100,000kb. If C elegans genomic DNA is digested with XbaI, which recognizes and cleaves the seque
nasty-shy [4]

Answer:

25000 fragments

Explanation:

A restriction enzyme can cut a random DNA sequence once per every 4^n where n = number of bases in the recognition site of enzyme.

There are 6 bases in Xbal's recognition site (TCTAGA) so it will cut once per every 4^6 = 4096 bases (4kb).

Total genomic size = 100000kb

So expected number of fragments = Total genomic size/Size of one fragment

= 100000/4

= 25000 fragments

5 0
3 years ago
Katie has been diagnosed with breast cancer and is under significant stress. she is undergoing a series of chemotherapy treatmen
zzz [600]

Resistance stage of the general adaptation syndrome (gas)

Resistance stage is the second stage in which the body goes through series of changes while trying to resist or adapt to the stressor. For the question given above, according to Hans Selye, Katie is currently in the resistance stage of the general adaptation syndrome (gas).






6 0
3 years ago
In John Watson's Little Albert experiment, the white rat was the ________ and the loud noise was the ________.
Korolek [52]

Answer:

In John Watson's Little Albert experiment, the white rat was stimulus associated specific entity and the loud noise was the associated stimulus.

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3 years ago
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