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kobusy [5.1K]
3 years ago
6

A population decreases after many members emigrated when a nearby river becomes polluted. How would you explain the reason for t

his decrease?
Biology
2 answers:
pochemuha3 years ago
8 0
More people cone in and pollute things do animals will leave because it’s bad for them
Olenka [21]3 years ago
3 0
Emigrated means they exited so due to the high amounts of pollution all the animals left which cause a population decrease
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If a cytosine base is substituted for by a thymine base in a DNA segment during DNA replication, the sequence could code for the wrong amino acid during translation.

The change in the sequence of DNA is known as mutation.

When a base substitution occurs in the sequence of a DNA during replication, the genetic information in the region where the substitution occurred becomes compromised.

During transcription, the process of encoding genetic information on DNA into RNA, the base substituted is also transcribed along. If cytosine is substituted by thymine, adenine is transcribed instead of guanine.

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6 0
3 years ago
Following the rules of complementary base pairing, which of these DNA bases could successfully bond with adenine?
AURORKA [14]

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Thymine

Explanation:

Adenine is a Purines together with Guanine .

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This is a complementary base pairing that hold the two strands of DNA bases together by weak hydrogen bonds for flexibility and easily unwind during replication

Purines are larger in size beaxuae they have 2 ring structures while Pyrimidines aee smaller because of one ring structure.

Therefore two purines (Adenine and Guanine can not pair together;

It must be a Purines -Pyrimidines pairs.

Therefore Adenine must pair with Thymine and cyosine with Guanine

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