AS Biology Topic 2.5
- Created by: TobyHill5
- Created on: 28-04-18 14:53
Other questions in this quiz
2. guard cells actively transport potassium ions in, lowering the water potential of the cell so that......
- water moves in
- water leaves
3. the fluidity of membranes in colder temperature is determined by.......
- number of phospholipids
- proportions of saturated and unsaturated fatty acids
- glycoproteins
4. Which molecule does not travel across membranes via simple diffusion?
- O2
- Water
- CO2
- ions
- steroid hormones
5. Which is NOT a role of a membrane at the SURFACE of cells
- site of chemical reactions
- has antigens so that the organisms immune system can recognise the cell as not foreign
- hold digestive enzymes inside the cell
- may contain enzymes involved in specific metabolic pathways
- separate's cells components from external environment
- regulates transport of materials into and out of the cell
- contains receptors for such chemical signals, so it is a site for cell communication and signalling
- may release chemicals that signal to other cells
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