Movement across membranes

Free ESAT Biology lesson. Worked examples, common mistakes and a self-check.

What the lesson covers

Membranes and moving particles (B2.1)
Diffusion (B2.1)
Surface area to volume ratio (B2.1)
Osmosis and water potential (B2.1)
Osmosis in plant and animal cells (B2.1)
Investigating osmosis: potato cylinders (B2.1)
Active transport and comparing the processes (B2.1)
Self-check questions with answers (8)

Specification: B2.1. Codes follow the UAT-UK ESAT content specification.

How to use it

Read a section, then cover the worked example and try it yourself.
Check the common mistakes list: these are the slips the real test is built to catch.
Do the self-check without looking back. Mark it against the answers.
Then practise the topic under time, with the matching practice set.

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