October Vocabulary
Active transport
The movement of a substance across a plasma (cell) membrane against a concentration gradient
Cell theory
The theory that all living things are made of cells, that cells are the basic units of organisms, and that cells
come only from existing cells
Centromere
The central portion of the chromosome to which the spindle fibers attach during mitotic and meiotic division
Diffusion
The process by which molecules move from an area of greater concentration to an area of lesser concentration
Eukaryote
An organism whose cells possess a nucleus and other membrane-bound vesicles, including all members of the protist,
fungi, plant and animal kingdoms; and excluding viruses, bacteria, and blue-green algae
Exocytosis
The process in which a vesicle inside a cell fuses with a cell membrane and releases its contents to the external
environment
Germ Theory
of Disease
(Koch’s
Postulates)
Homeostasis
A set of criteria used to establish that a particular infectious agent causes a disease
The stable internal conditions of a living thing