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11 Cards in this Set
- Front
- Back
- 3rd side (hint)
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How are alveoli specialised? |
Enormous surface area, a moist lining, very thin walls, a good blood supply |
Think of the diffusion pathway |
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How are villi specialised? |
Increase surface area of intestine so food is absorbed quicker, single layer of surface cells, good blood supply for quick absorption |
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How are fish gills specialised? |
Gill filaments so large surface area lamellae to increase surface area - also lots of capillaries to speed up diffusion thin surface layer of cells to minimise diffusion pathway |
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What is a eukaryotic cell? |
A cell with a nucleus |
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What is a prokaryotic cell? |
A cell without a nucleus |
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Where can stem cells be found? |
Adult bone marrow, meristem cells, and embryos. |
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Describe therapeutic cloning |
The nucleus of an embryo is replaced with the same genes as a parent. The embryo is then allowed to develop. Embryonic stem cells are then taken from the embryo before it is destroyed. The stem cells can be used for stem cell therapy. |
Nucleus |
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What are the advantages of adult stem cells? |
More ethically acceptable Less likely to be rejected Easier to guide development Less likely to become cancerous Reduces the need for organ transplants. |
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How do you calculate magnification? |
Size of object / actual size of object |
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What is the definition of osmosis? |
Osmosis is the movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration |
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What is the definition of active transport? |
Active transport is the movement of substances from a region of lower concentration to a region of higher concentration, using energy |
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