Question

if part of the dna gene being transcribed is tgcaat, what will the mrna code be for that part?
○ t g c a a t
○ a c c g u u a
○ u g c a a u
○ u c c g t t u

Explanation:

Step1: Recall base - pairing rules

In transcription, DNA (deoxyribonucleic acid) to mRNA (messenger ribonucleic acid) base - pairing occurs. The rules are: A (adenine) in DNA pairs with U (uracil) in mRNA, T (thymine) in DNA pairs with A (adenine) in mRNA, G (guanine) in DNA pairs with C (cytosine) in mRNA, and C (cytosine) in DNA pairs with G (guanine) in mRNA.

Step2: Transcribe the DNA sequence

Given the DNA sequence TGCAAT.

• T pairs with A, G pairs with C, C pairs with G, A pairs with U, A pairs with U, T pairs with A.
• So, T→A, G→C, C→G, A→U, A→U, T→A. The mRNA sequence is ACGUUA.

Answer:

ACGUUA