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Transport across cell membranes
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Membrane structure and selective permeability

Membrane structure and selective permeability

Labelled fluid mosaic model showing phospholipid bilayer, hydrophilic heads, hydrophobic tails, channel protein, carrier protein, glycoprotein, glycolipid, cholesterol, oxygen crossing directly and sodium ion blocked A cell-surface membrane is a phospholipid bilayer with proteins, glycoproteins, glycolipids, and often cholesterol embedded in it. It is partially permeable, so its structure determines which substances cross easily.

Transport across cell membranes Lesson

  1. A Level
  2. /Biology
  3. /Transport across cell membranes

Step-by-step lessons covering AQA A Level Biology Transport across cell membranes for A Level Biology. Each lesson breaks down Transport across cell membranes, then works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.