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Base Pairing

The base sequ...

Question

The base sequence of DNA is CAT, TAG, CAT, CAT, GAC. What would be the base sequence of its complementary mRNA?

A

GUA, GUA, CUG, AUC, CUG

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B

AUG, CUG, CUC, GUA, CUG

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C

GUA, AUC, GUA, GUA, CUG

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D

GUC, CUG, CUG, CUA, CUU

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Solution

The correct option is C GUA, AUC, GUA, GUA, CUG
If the base sequence of one strand of DNA is CAT, TAG, CAT, CAT, GAC, the base sequence of its complementary mRNA would be GUA, AUC, GUA, GUA, CUG. During transcription of mRNA, adenine (A) is replaced by uracil (U), thymine (T) by adenine (A), guanine (G) by cytosine (C) and cytosine (C) by guanine (G).

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