# Distinguish between prokaryotic and eukaryotic cells in terms of their internal organisation.

> IB DP Biology Standard Level (2023 syllabus) — A2.2 Cell structure · Distinguish · 4 marks

## Mark scheme (4 marks)

1. Prokaryotic cells lack a membrane-bound nucleus, whereas eukaryotic cells possess a nucleus enclosed by a double membrane (nuclear envelope).
2. Prokaryotic cells lack membrane-bound organelles, whereas eukaryotic cells contain membrane-bound organelles such as mitochondria and endoplasmic reticulum.
3. Prokaryotic DNA is circular and located in a region called the nucleoid (not enclosed by a membrane), whereas eukaryotic DNA is linear and contained within the nucleus.
4. Prokaryotic cells are generally much smaller than eukaryotic cells (prokaryotes typically 1–10 µm; eukaryotes typically 10–100 µm).

## Key terms

- [eukaryotic cell](https://www.gradenine.co.uk/glossary/eukaryotic-cell)

## Related

- [Revision notes for IB DP Biology Standard Level (2023 syllabus)](https://www.gradenine.co.uk/learn)
- [How to answer "Distinguish" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/distinguish-between-prokaryotic-and-eukaryotic-cells-010b1bb8) · Published by Druglandscape Ltd.