Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A biomolecule fragment contains a nitrogenous base, a pentose sugar and a phosphate group joined into a repeating chain.
Total: 4 marks
(a) Name the monomeric unit described. (1 mark)
(b) What would the unit be called if phosphate were absent? (1 mark)
(c) Name the broad class of biomolecule formed by the repeating chain. (1 mark)
(d) State one biological role of this class. (1 mark)
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