Question

What will happen if a base sequence of a strand of DNA is changed from A-T-G to A-T-C?

A. The mRNA will be changed from U-A-C to U-A-G during translation.

B. The mRNA will be changed from C-A-U to C-A-C during transcription.

C. The mRNA will be changed from U-A-C to U-A-G during transcription.

D. The mRNA will be changed from U-A-C to T-A-C during translation.​

Answer 1

Answer:

C. The mRNA will be changed from U-A-C to U-A-G during transcription.

Explanation:

Transcription is the process where the mRNA strand is formed, using a DNA strand as a template strand.

The bases on an mRNA are adenine [A], uracil [U], guanine [G] and cytosine [C], where adenine is complementary to uracil and guanine is complementary to cytosine.

[Translation is the process where a polypeptide chain- a sequence of amino acids, is formed. tRNA molecules carry specific amino acids and bind to the codon on the mRNA which is complementary to the anticodon on the tRNA. Thus option A and D is wrong.]

[Option B is wrong because the bases are not complementary.]