Q16 · Practice questionSimple familiar1 mark
QUESTION 16
In a double-stranded DNA molecule, 28% of the bases are adenine. What percentage are cytosine?
(A)
14%
(B)
22%
(C)
28%
(D)
44%
WORKED SOLUTION
1 markAnswer B
Answer
B
Working
A pairs with T, so A and T together account for 56%. The remaining 44% is divided equally between G and C, giving 22% cytosine.
Marking criteria
- Select B. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus