本题目来源于试卷: Unity and Diversity A.2 Nucleic Acids，类别为 IB生物学
[单选题]
Statements below show three double-stranded nucleotids (zug1cy(-(lj(yrx q e w4pm a4bzza5 ;sequences. Which of these sequences of base pairs is possible iz4aa m; zb4pw5n a DNA molecule?
I. 5’- GGA CAG AGC -3’
3’- CCT GTC TCG -5’
II. 5’- GGA CAG AGC -3’
3’- TTC ACT CTA -5’
III. 5’- AGG GAC CGA -3’
3’- TCC CTG GCT -5’
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
参考答案: B
本题详细解析:
DNA molecules consis:/+4 kor bfmiee8rkkdqn;0zf ne,3*bt of four nitrogenous bases: adenine (A), cytosine (C), guanine (G) and thymine (T). In DNA molecules, adenine always pairs with thymine and cytosine always pairs with guanine. This is known as complementary base pairing.Sequences I and III both f8 */z rfb,f en :mrd;eko k+34nkbe0qiollow base-pairing rules correctly. Statement II is incorrect because it shows T paired with G and A paired with C.
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