Biology Chapter 1 - Part 1
- Created by: elliebaxter
- Created on: 22-12-16 10:37
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- Biology Chapter 1 - Part 1
- Cells
- Yeast is a single celled organism which is specialised to survive with little oxygen
- The cells use aerobic respiration but when there is no oxygen available they can use anaerobic respiration (fermentation)
- Bacteria cannot be seen by the naked eye unless they form a bacterial colony
- Yeast is a single celled organism which is specialised to survive with little oxygen
- Specialised cells
- Receptor cells have special structures that allow them to detect eg. cone cells in the eye are light sensitive, specialised to connect with the optic nerve
- Plant cells with many chloroplasts photosynthesise eg. mesophyll cells of a leaf
- Lots of ribosomes making lots of protein made eg. gland cells producing enzymes
- Root hair cell increase surface area of root so can absorb more water
- Diffusion
- The net movement of particles from a high conc. to a low conc. (difference is called the concentration gradient)
- The larger the concentration gradient, the faster the rate of diffusion
- Examples of diffusion: -oxygen and glucose into cells of the body from the bloodstream for respiration -CO2 into photosynthesising plants -simples sugars and amino acids from gut through cell membrane
- The net movement of particles from a high conc. to a low conc. (difference is called the concentration gradient)
- Cells
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