Question

hydrogen bonds form between certain nitrogenous bases according to the rules of complementary base pairing. biologists often refer to the nucleotides in dna by the first letters of their base names: a, t, c, and g. according to the rules of complementary base pairing, which sequence of nucleotides would form hydrogen bonds with the dna sequence cagtc? options: gactg, tgact, cagtc, ctgac, actga, gtcag (image shows dna structure with nitrogenous bases a, t, c, g labeled, and base pairs, sugar, phosphate group, hydrogen bond, covalent bond, deoxyribose sugar).

Explanation:

Step1: Recall base pairing rules

In DNA, complementary base pairing is: A (adenine) pairs with T (thymine), and C (cytosine) pairs with G (guanine).

Step2: Pair each base in CAGTC

• First base: C (cytosine) pairs with G (guanine)
• Second base: A (adenine) pairs with T (thymine)
• Third base: G (guanine) pairs with C (cytosine)
• Fourth base: T (thymine) pairs with A (adenine)
• Fifth base: C (cytosine) pairs with G (guanine)

So the complementary sequence to CAGTC is GTCAG.

Answer:

GTCAG