A-Level Biology Cells Revision Notes

• 1Cells are classified into prokaryotic and eukaryotic types.
• 2Eukaryotic cells contain membrane-bound organelles, including the nucleus.
• 3Cell membranes are selectively permeable, controlling the movement of substances in and out.
• 4Cell division occurs through mitosis and meiosis.
• 5Cellular respiration and photosynthesis are key metabolic processes.

Cells are tiny units that make up all living things. They can be simple, like bacteria, or complex, like human cells. Each cell has parts that help it do its job, like taking in nutrients or making energy. Understanding how cells work helps us learn about life itself.