Explain why the nucleus is essential for a cell to be able to divide and produce new cells.

Edexcel GCSE Biology (1BI0) — 1.1 Cell biology · Explain · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

The nucleus contains the cell’s DNA, which carries the instructions for making proteins and for all cell processes. Before a cell can divide, this DNA must be copied or replicated so that each daughter cell receives a complete set of genetic material. Without a nucleus, the new cells would lack a full copy of the DNA and therefore could not function or survive.

Examiner tips

Use the phrase "contains DNA" and "DNA carries the instructions" to hit the first two points. Mention "replicated before division" to cover the third. Explain the consequence of lacking a nucleus for the fourth point. Keep the answer short and to the point to fit the 4‑mark limit.

Common mistakes

Forgetting to mention DNA replication. Using vague terms like "genetic material" without linking it to the nucleus. Writing a long paragraph instead of concise points, losing marks for lack of focus.

Mark scheme (4 marks)

The nucleus contains DNA / genetic material / chromosomes
DNA carries the instructions / information for making proteins / for cell processes
DNA must be copied / replicated before a cell can divide
Without the nucleus, the new cells would not receive a complete set of DNA / genetic information and could not function / survive

Key terms in this question

nucleus