Cambridge IGCSE Biology practice

Paper 4 structured question: Chromosomes, genes and proteins

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Paper

Marks

Topic

Chromosomes, genes and proteins

Exam-style question

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Paper 4Theory (Extended)3 marks

Gene expression in body cells

Description

Most body cells contain the same genes, but many genes are not expressed in a specific cell because it only produces the proteins it requires.

a
Explain why many genes are not expressed in a specific body cell.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 4Theory (Extended)4 marks

Description

All body cells have the same genes, but they produce different proteins depending on which genes are expressed.

a
State what determines which proteins a body cell produces.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Explain how gene expression leads to different cell types in the body.
Your answer
Aim for approximately 3 distinct marking points.
[3]