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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'.
outgrowths that transmit nerve impulses away from the cell body of a neuron.
the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.
in plants: the first plant to become established in an area.in plants: the first plant to become...