B2 REVISION

revision for all of unit B2 additional science higher tier

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CELLS

nucleus: controls the activities of the cell

cytoplasm: controls the chemical reactions in the cell

ribosomes: protien synthesis happens there

mitochondria: most energy used in respiration is from here

cell membrane: controls the substances that go in and out the cell

cell wall: found in plant cells, strengthens the cell

vacuole: filled with cell sap, keeps it turgid

chloroplasts: contain chlorophyll used for photosynthesis

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CELLS- diffusion

DIFFUSION: high concentration-low concentration

its when particles spread and it happens between dissolved substances.

e.g. smell of cooking travelling around a room.


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CELLS-osmosis

OSMOSIS: 

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