CAIE A-Level Biology AS 6.1.2 Purines Adenine Guanine Questions
Explain purine structure and complementary pairing for adenine and guanine, using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain the structures and complementary pairing of purines, including adenine and guanine.
CAIE A-Level Biology AS 6.1.2 Purines Adenine Guanine Questions question 1
[Maximum number: 1]
Which row represents the correct features of guanine?
has a single ring structure
is a purine
joins its complementary base via three hydrogen bonds
pairs with thymine
key
✓ = correct
χ= not correct
✓
✓
χ
✓
✓
χ
✓
χ
x
✓
✓
×
χ
χ
✓
✓
C
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