Difficulty: Medium
Average Score: 85%
Entry Exam
Which of the following DNA strands would complement the segment: ACTTGCA?
Correct answer
A
Rationale
In DNA, adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G). To find the complementary strand, you need to match each base with its complementary base. The segment ACTTGCA consists of bases A, C, T, T, G, C, A, which would pair with T, G, A, A, C, G, T, respectively. Therefore, the complementary strand would be TGAACGT. Thus, option A (TGAACGT) is the correct choice as it follows the base-pairing rules in DNA.