Question

21 what is the correct mrna strand from this dna? cac - gtg - aca - gcg a gug - cac - ugu - cgc b gtg - cac - tgt - cgc c cac - gug - aca - gcg

Explanation:

In transcription, DNA bases pair with complementary RNA bases. Adenine (A) in DNA pairs with Uracil (U) in mRNA, Thymine (T) in DNA pairs with Adenine (A) in mRNA, Cytosine (C) pairs with Guanine (G), and Guanine (G) pairs with Cytosine (C).
For the DNA strand CAC - GTG - ACA - GCG:

• C pairs with G, A pairs with U, C pairs with G for the first triplet (CAC→GUG).
• G pairs with C, T pairs with A, G pairs with C for the second triplet (GTG→CAC).
• A pairs with U, C pairs with G, A pairs with U for the third triplet (ACA→UGU).
• G pairs with C, C pairs with G, G pairs with C for the fourth triplet (GCG→CGC).

Answer:

A. GUG - CAC - UGU - CGC