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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'.
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
plastids responsible for pigment synthesis and storage. They mainly contain carotenoids, but can...
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
the process whereby a particular change causes a response which reverses that change.
double-membraned, pigmented, cytoplasmic organelles found in plant cells. The organelles have...