CAIE IGCSE Biology 17.1.6 Amino Acid Sequence & Protein Shape
Practise explaining how different amino-acid sequences produce proteins with different three-dimensional shapes.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that different amino-acid sequences cause protein molecules to fold into different shapes
- link a changed protein shape to altered function, binding or cell structure
- apply the relationship to haemoglobin changes that produce rigid, sickle-shaped red cells
17.1.6—Different sequences of amino acids question 1
Fig. 2.1 shows a dwarf sunflower and a tall sunflower, Helianthus annuus. The height of the dwarf sunflower is 0.45 m and the height of the tall sunflower is 4.5 m .
not to scale
Dwarf plants like the one in Fig. 2.1 have mutant alleles.
Shoot growth in plants is controlled by auxins. An enzyme in shoot tips converts molecules of an amino acid into auxins as shown in Fig. 2.2.
Fig. 2.2
Explain how a mutation in DNA results in an abnormal enzyme which does not catalyse the reaction shown in Fig. 2.2.
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