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9 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is essential for diffusion
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a concentration gradient
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a) a concentration gradient
b) a selectively permeable membrane c) a source of energy d) a protein |
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how do animals use cholesterol
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to form part of the structure of cell membranes
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a)to form part of the structure of cell membranes
b)to increase the blood pressure during exersize c)to insulate neurones between nodes of Ranvier td)o help in storage of energy |
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which of the following is necessary for osmosis to occur
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solute concentration gradient
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a) an enzyme
b) a fully permeable membrane c) ATP d) solute concentration gradient |
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what is facilitated diffusion
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the passive movement of a particle across the cell via channel protein
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the passive movement of a particle through the phospholipid bilayer of the cell membrane
the passive movement of a particle across the cell via channel protein the movement of a particle down a concentration gradient helped by active pumping the movement of a particle up a concentration gradient helped by active pumping |
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distinguish
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osmosis is the movement of water from an area of high SOLUTE concentration gradient to an area of low solute concentration gradient across a partially permeable membrane
diffusion is the movement of the solutes when this is possible, if this is impossible, osmosis can happen. |
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explain how the properties of phospolipids help to maintain the structure of the cell surface membrane
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because there is a polar and non polar side the non polar side stays on the inside because it is "afraid" of water. the hydrophilic heads face outwards and the hydrophobic tails face inwards. ions and polar molecules cannot pass through.
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state the composition and function of the plant cell wall
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the plant cell wall is a rigid structure made up of cellulose which is a sugar polysaccride. its function is for support and protection. it maintains the cell shape and size.
structural support, protection, and maintaining turgor pressure |
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state two processes involving mitosis
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growth, healing, cloning (asexual reproduction)
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explain the importance of the surface area to volume ratio as a factor limiting cell size
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rate of material/heat exchange
diffusion is proportional to surface area rate of metabolism is proportional to mass/Volume as a cell grows the volume expands faster than the surface area surface area to volume ratio decreases |
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