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the movement of molecules across a membrane against the concentration gradient, from an area of lower concentration to an area of higher concentration of a particular molecule, using energy supplied by ATP.
when humans construct or alter the genome of an organism.
a species that has a large effect on its environment relative to its abundance and plays an...
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
a hormone that causes the secretion of gastric juices into the stomach.