Question

which of these will complete the mrna strand for the dna strand in the diagram below? mrna dna guc aug cag uac

Explanation:

In transcription, DNA bases pair with mRNA bases. The base - pairing rules are: A (adenine) in DNA pairs with U (uracil) in mRNA, T (thymine) in DNA pairs with A (adenine) in mRNA, C (cytosine) in DNA pairs with G (guanine) in mRNA, and G (guanine) in DNA pairs with C (cytosine) in mRNA.
Looking at the DNA strand (from left - to - right in the diagram), for the first three unpaired DNA bases (C, A, G), the complementary mRNA bases are G (pairs with C), U (pairs with A), C (pairs with G).

Answer:

GUC