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SABiologyQuick questions
Topic 2: Cells as the Basis of Life
Quick questions on The cell membrane and transport (SACE Stage 2 Biology)
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is diffusion?Show answer
Diffusion is the net movement of particles from a region of high concentration to a region of low concentration until evenly spread. Small non-polar molecules such as oxygen and carbon dioxide diffuse directly through the bilayer.
What is osmosis?Show answer
Osmosis is the diffusion of water across a selectively permeable membrane, from a region of higher water concentration (lower solute concentration) to a region of lower water concentration (higher solute concentration).
What is facilitated diffusion?Show answer
Facilitated diffusion is passive movement of substances that cannot cross the bilayer alone (such as glucose and ions) through channel or carrier proteins. It is still down the gradient, so it needs no energy.
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