Biology

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  • Created by: Abi14
  • Created on: 16-03-14 17:34
what are sepcialised cells?
cells that are specialised to carry out a particular function.
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what does it mean if a specalised cell has lots of mitochondria?
it must need a lot of energy, e.g muscle cells and sperm cells
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what does it mean if a specalised cell has lots of ribosomes?
it needs to create a lot of protein, e.g gland cells which produce enzymes
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what do cells with tails do?
they are able to move, e.g sperm cell.
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what does the specialised structure of a receptor cells allow them to do?
enables them to detect a stimuli, e.g the cone cell in the eye are light sensitive
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what do cells with lots of chloroplasts do?
they will be photosynthesising e.g mesophyll cells of a leaf
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why do root hair cells increase the surface area of the root?
so that it can absorb water and mineral ions efficently.
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how can dissolved substances and gases move into and out of cells?
diffusion
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what is diffusion?
is the spreading out of the particles of a gas, or any substance in solution, resulting in a net movement from a region where they are of higher concentration to an area with a lower concentration.
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what affects the speed of diffusion?
the greater the difference in concentration, the faster the rate of diffusion.
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what are some examples of diffusion?
*oxygen into the body cells from the bloodsteam as the cells are respiring, and using up oxygen * carbon dioxide into actively photosynthesising plant cell *simple sugars and amino acids from the gut through cell membranes
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why would there be a net movement from an area of high concentration to low concentration? (diffusion)
because the particles move randomly
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what is net movement?
the overall movement of....
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Card 2

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what does it mean if a specalised cell has lots of mitochondria?

Back

it must need a lot of energy, e.g muscle cells and sperm cells

Card 3

Front

what does it mean if a specalised cell has lots of ribosomes?

Back

Preview of the front of card 3

Card 4

Front

what do cells with tails do?

Back

Preview of the front of card 4

Card 5

Front

what does the specialised structure of a receptor cells allow them to do?

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