Question

a segment of dna shows bases in this order agt cac gca, complete the corresponding dna strand: tca gtg? a acg b cgt c gca d tgc

Explanation:

Step1: Recall base pairing rules

DNA bases pair as A-T, T-A, C-G, G-C.

Step2: Match the last triplet

Original DNA: AGT CAC GCA → last triplet is GCA.

Step3: Find complementary bases

G pairs with C, C pairs with G, A pairs with T → complementary triplet is CGT.

Answer:

B. CGT