Deoxyribonucleic acid (DNA) is a double-stranded nucleic acid molecule - HSC - SSCE Biology - Question 10 - 2003 - Paper 1
Question 10
Deoxyribonucleic acid (DNA) is a double-stranded nucleic acid molecule. For all double strands of DNA, which one of the following statements is true?
(A) The number... show full transcript
Worked Solution & Example Answer:Deoxyribonucleic acid (DNA) is a double-stranded nucleic acid molecule - HSC - SSCE Biology - Question 10 - 2003 - Paper 1
Step 1
The numbers of adenine (A) and guanine (G) bases are equal.
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Answer
This statement is false. In DNA, adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). There is no requirement for the number of adenine to equal guanine.
Step 2
The numbers of guanine (G) and cytosine (C) bases are equal.
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Answer
This statement is true. In double-stranded DNA, the amount of guanine (G) will always equal the amount of cytosine (C) due to base pairing; G pairs with C.
Step 3
The numbers of thymine (T) and cytosine (C) bases are equal.
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Answer
This statement is false. Thymine (T) does not pair with cytosine (C). In double-stranded DNA, T pairs with A, and there is no equivalence needed between T and C.
Step 4
The numbers of adenine (A), guanine (G), thymine (T) and cytosine (C) bases are equal.
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Answer
This statement is false. The total amounts of adenine (A) and thymine (T) will equal each other, as well as guanine (G) and cytosine (C), but there is no equal distribution among all four bases.
