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states that the cell membrane consists of a double layer of phospholipids in association with large protein molecules. Each phospholipid molecule consists of two parts, the 'head' and the 'tail'.
cartilage with few collagen fibres and no elastin fibres. It reduces friction in joints,...
tough cartilage that acts as a shock absorber between vertebrae and at the ends of bones in ball...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
all the chemical reactions involved in maintaining the living state of the cells and the...
plants that live in areas with a moderate water supply where it is neither wet nor dry.