Equilibrium species
Species characterized by low reproduction rates, long development times, large body size,
and long adult life with repeated reproductions.
Equational division
Nuclear division in which each chromosome divides into equal longitudinal halves.
Equatorial plate
The plane located midway between the poles of a dividing cell during the metaphase stage
of mitosis or meiosis. It is formed from the migration of the chromosomes to the center of
the spindle
Ergastic substances
Ergastic substances are non-protoplasm materials found in cells.
Ergot
The disease caused by such a fungus.
ER membranes
In eukaryotes, the functional continuum of membraneous cell components consisting of the
nuclear envelope, endoplastic reticulum, and Golgi apparatus as well as vesicles and other
structures derived from these major components.
Ergastic substances
Ergastic substances are non-protoplasm materials found in cells. The living protoplasm of a
cell is sometimes called the bioplasm and distinct from the ergastic substances of the cell.
Erythrocyte
A red blood cell; contains hemoglobin, which functions in transporting oxygen in the
circulatory system.
Esophagus
A channel that conducts food, by peristalsis, from the pharynx to the stomach.
Essential amino acids
The amino acids that an animal cannot synthesize itself and must obtain from food. Eight
amino acids are essential in the human adult.
Esterification
A chemical reaction resulting in the formation of at least one ester product.
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