A-Level Biology Specification

Edexcel B 9BI0

Section 4.2: Cell transport mechanisms

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#4.2i

Know the structure of the cell surface membrane with reference to the fluid mosaic model.

#4.2ii

Understand how passive transport is brought about by:

- diffusion
- facilitated diffusion (through carrier proteins and protein channels)
- osmosis.

#4.2iii

Understand how the properties of molecules affects how they are transported, including solubility, size and charge.

#4.2iv

Know that large molecules can be transported into and out of cells through the formation of vesicles, in the processes of endocytosis and exocytosis.

#4.2v

Understand the process of active transport, including the role of ATP.

#4.2vi

Know that phosphorylation of ADP requires energy and that hydrolysis of ATP provides an accessible supply of energy for biological processes.