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a chemical messenger produced and released by a cell or a gland in one part of the body of the organism that affect cells in other parts of the organism. In essence, it is a chemical messenger that transports a signal from one cell to another. Only a small amount of hormone is required to alter cell metabolism. Hormones in animals are most often transported in the blood.
a state in which the body temperature has dropped to dangerously low levels.
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
a disease caused by the bacterium Vibriocholera, which produces a toxin in the lining of the...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...