Question

select the correct answer.
what is the complementary base sequence of the dna strand if the template strand reads ttgcacg?
a. cctatgc
b. ttgccgc
c. aacgtgc
d. ggtacta

Explanation:

Step1: Recall base - pairing rules

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

Step2: Find complementary base sequence

The template strand is TTGCACG.
For the first base T, the complementary base is A.
For the second base T, the complementary base is A.
For the third base G, the complementary base is C.
For the fourth base C, the complementary base is G.
For the fifth base A, the complementary base is T.
For the sixth base C, the complementary base is G.
For the seventh base G, the complementary base is C.
So the complementary sequence is AACGTGC.

Answer:

C. AACGTGC