Difficulty: Medium
Average Score: 64%
Entry Exam
Which option demonstrates complementary base pairing in DNA?
Correct answer
D
Rationale
In DNA, adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). This is known as complementary base pairing. Adenine always pairs with thymine via two hydrogen bonds, forming a strong bond essential for DNA structure and replication. Therefore, the correct option that demonstrates complementary base pairing in DNA is A and T (D). This pairing is crucial during DNA replication and ensures the accurate transmission of genetic information.