If mRNA is complementary to the DNA template strand and the DNA template stand i

ID: 300710 • Letter: I

Question

If mRNA is complementary to the DNA template strand and the DNA template stand is complementary to the DNA non-template strand, why are base sequences of mRNA and the DNA non-template strand not identical? Could they ever be?

a. No, they cannot be identical because the T nucleotide in DNA is replaced with U nucleotide in RNA and AUG is the start codon.

b. No, they cannot be identical because the T nucleotide in RNA is replaced with U nucleotide in DNA.

c. They can be identical if methylation of the U nucleotide in RNA occurs and gives T nucleotide.

d. They can be identical if de-methylation of the U nucleotide in RNA occurs and gives T nucleotide.

Explanation / Answer

No , they cannot be identical because the T nuceotide in DNA is replaced with U nucleotide in RNA and AUG is the start codon.

Hence option A is correct.

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If mRNA is complementary to the DNA template strand and the DNA template stand i

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