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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'.
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
organisms whose cells have a true nucleus and true organelles. These structures are not...
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
when the entire heart, both of the atria and ventricles, is relaxed.