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vodomira [7]
3 years ago
12

Plsss helps plss Extra 20 points

Biology
1 answer:
JulijaS [17]3 years ago
5 0
A is the answer I’m sure because I just took the test
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Describe natural selection
Rina8888 [55]

Answer:

Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

Explanation:

8 0
3 years ago
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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
Which one of the following nucleotide pairs would be found in a DNA molecule?
MrRa [10]

Guanine-cytosine is one of the  nucleotide pairs that would be found in a DNA molecule. The other is Adenine- Thiamine.

Explanation:

Pyrine bases – Adenine & Guanine-  pair with pyrimidines bases – Cytosine and Thiamine. Adenine pairs with Thiamine while Cytosine pairs with Guanine.

In RNA, however, while this same principle of base pairing is observed, rather than Thinmaine, RNA has Uracil in its place. Therefore, in RNA, Adenine pairs with Uracil. There is no Thiamine in RNA.

Learn More:

For more on base-pairing check out;

brainly.com/question/2739575

brainly.com/question/10444320

#LearnWithBrainly

8 0
3 years ago
What are the four biological compounds in living things?
sergejj [24]
There are more than simply 4 biological compounds in the human body. I suppose to categorise, the question is hinting towards the molecules like Carbohydrates ( Poly and mono saccharides ) Proteins ( Polypeptides Made of amino acids) and Fats. There is also water, but I'm hesitant to class that as a biological compound, as it's not organic. 
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3 years ago
NEED HELP ASAP WILL GIVE YOU BRAINLIEST ANSWER AND 50 POINTS!!!!!!
Stella [2.4K]

I don't understand, what is the question you're supposed to answer?

6 0
3 years ago
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