Case study·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 student prepares a one-page summar; proteins are polymers of amino acids; enzymes are biological catalysts; nucleic acids carry genetic information; hormones act as chemical messengers. The teacher asks the student to connect each statement to one structural or functional clue.
Total: 4 marks
(a) Give one carbohydrate example used for plant structure. (1 mark)
(b) Name the bond joining amino acid residues in proteins. (1 mark)
(c) State why enzyme shape matters. (1 mark)
(d) State what feature of DNA carries genetic information. (1 mark)
Something wrong with this item?