Question

question 21 of 25
what strand of mrna would be produced from the strand of dna shown below?
gct aag
a. cga uuc
b. cga ttc
c. gca uug
d. gct aag

Explanation:

Step1: Recall base - pairing rules

In transcription, DNA base pairs with mRNA. 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: Apply base - pairing

For the DNA strand GCT AAG:

• G pairs with C, C pairs with G, T pairs with A (first three letters GCT → CGA)
• A pairs with U, A pairs with U, G pairs with C (last three letters AAG → UUC)

So the mRNA strand is CGA UUC.

Answer:

A. CGA UUC