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The cell membrane

The cell membrane

Partially permeable cell membrane showing small molecules passing through while sucrose and sodium ions are held back

Every cell is surrounded by a thin cell membrane that separates the cytoplasm from the surroundings. It is partially permeable, so some substances can cross it while others are held back.

2.1 Supplying the cell Lesson

  1. GCSE
  2. /Biology
  3. /2.1 Supplying the cell

Step-by-step lessons on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons