Question

Remember that DNA is transcribed from the template strand (antisense or transcribed strand) BUT the coding (sense) strand is the strand that mimics mRNA. Exon of the coding strand is 5' TCA GAG 3'. Then the template strand will be _____, and the mRNA strand will be ____.

A) 3' AGT CTC 5', 5' TCA GAG 3'
B) 5' AGT CTC 3', 5' UCU CAG 3'
C) 3' TCA GAG 5', 5' AGT CTC 3'
D) 5' TCA GAG 3', 5' AGT CTC 3'

Answer 1

The template strand complementary to the coding strand 5' TCA GAG 3' is 3' AGT CTC 5', and the resulting mRNA strand will be 5' UCA GAG 3'. The correct answer is Option A.

Step-by-step explanation:

The exon of the coding strand of DNA given is 5' TCA GAG 3'. Thus, the template strand, which is complementary to the coding strand and used during transcription, will have the sequence 3' AGT CTC 5'. Based on the rules of base pairing in transcription, where adenine (A) pairs with uracil (U) in RNA, and cytosine (C) pairs with guanine (G), the mRNA strand that is synthesized from this template strand will have the sequence 5' UCA GAG 3'. Therefore, the correct answer is Option A) 3' AGT CTC 5', 5' UCA GAG 3'.