Medical BiologyLesson 1 of 3

Eukaryotic Cell Structure & Membrane Transport

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Cell biology constitutes 35%+ of the IMAT Biology section.

Organelles:
*Mitochondria*: Site of Krebs Cycle & Oxidative Phosphorylation (ATP production).
*Ribosomes*: Site of translation (protein synthesis).
*Lysosomes*: Contain hydrolytic enzymes for intracellular digestion.
Membrane Transport:
*Passive (No ATP)*: Simple diffusion (small non-polar molecules like O₂, CO₂), Facilitated diffusion (glucose via GLUT channels), Osmosis (water).
*Active (Requires ATP)*: Na⁺/K⁺ ATPase Pump (moves 3 Na⁺ out and 2 K⁺ in against concentration gradients).

Exam strategy

Focus on understanding underlying concepts — exam questions test application, not memorization.