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Which of the following is the correct base-pairing in DNA? (A) G—C, A—T (B) T—U, A—G (C) G—T, A—C (D) G—C, A—U - HSC - SSCE Biology - Question 11 - 2004 - Paper 1
Question 11
Which of the following is the correct base-pairing in DNA? (A) G—C, A—T (B) T—U, A—G (C) G—T, A—C (D) G—C, A—U
Worked Solution & Example Answer:Which of the following is the correct base-pairing in DNA? (A) G—C, A—T (B) T—U, A—G (C) G—T, A—C (D) G—C, A—U - HSC - SSCE Biology - Question 11 - 2004 - Paper 1
Step 1
Identify correct base pairings
Answer
In DNA, the correct base pairing occurs between adenine (A) and thymine (T), as well as between guanine (G) and cytosine (C). Therefore, the base pairs are:
- A—T
- G—C
From the options provided:
- (A) G—C, A—T is correct.
- (B) T—U, A—G is incorrect since T does not pair with U in DNA.
- (C) G—T, A—C is incorrect as these pairings do not exist in DNA.
- (D) G—C, A—U is incorrect as A pairs with T in DNA, not U.
Step 2