AQA Biology Cells Revision Notes
Master AQA Biology Cells using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Cells are the basic structural and functional units of all living organisms. They can be prokaryotic or eukaryotic, with eukaryotic cells containing membrane-bound organelles. Understanding the structure and function of cells is essential for studying biology.
Key Concepts
- 1Cells are the basic units of life.
- 2Prokaryotic cells lack a nucleus and membrane-bound organelles.
- 3Eukaryotic cells have a nucleus and organelles like mitochondria and ribosomes.
- 4Cell membranes are selectively permeable, controlling the movement of substances.
- 5Cell division occurs through processes like mitosis and meiosis.
Simple Explanation
Cells are tiny building blocks that make up all living things. There are two main types of cells: prokaryotic, which are simpler and do not have a nucleus, and eukaryotic, which are more complex and contain a nucleus and other parts. Cells work together to perform functions necessary for life, like producing energy and making proteins.
Memory Trick
“Remember 'PEM' for Prokaryotic (no organelles), Eukaryotic (with organelles), and Membrane (selectively permeable).”
Flashcards
What are the two main types of cells?
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Exam Questions
Describe and explain the structure of a eukaryotic cell. [6 marks]
6 marksView mark scheme hint▾
Mention the nucleus, organelles, and cell membrane; explain their functions.
Explain how the structure of the cell membrane relates to its function. [4 marks]
4 marksView mark scheme hint▾
Discuss the phospholipid bilayer and protein functions.
What is meant by selective permeability? [2 marks]
2 marksView mark scheme hint▾
Define selective permeability and give examples of substances that can pass through.
Practice Quiz
Which type of cell lacks a nucleus?
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