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BIO UNIT 1 & 2
Definitions
Term | Definition |
---|---|
nutrition | the process of providing or obtaining the food necessary for health and growth. |
metabolism | the chemical processes that occur within a living organism in order to maintain life. |
growth | the process of increasing in physical size. |
response | any behavior of a living organism that results from an external or internal stimulus. |
excretion | (in living organisms and cells) the process of eliminating or expelling waste matter. a product of excretion. |
homeostasis | the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. |
reproduction | the production of offspring by a sexual or asexual process. |
differentiation | the action or process of differentiating. |
stem cells | an undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation |
multicellular organism | organisms that consist of more than one cell, in contrast to unicellular organisms. |
binary fission | A method of asexual reproduction that involves the splitting of a parent cell into two daughter cells. |
resolution | the shortest distance between two points on a specimen that can still be distinguished by the observer or camera system as separate entities. |
compartmentalization | The formation of cellular compartments |
prokaryotes | A microscopic single-celled organism which has neither a distinct nucleus with a membrane nor other specialized organelles |
eukaryote | Any of the single-celled or multicellular organisms whose cell contains a distinct, membrane-bound nucleus |
amphipathic | Pertains to a chemical compound containing both polar (water-soluble) and nonpolar (not water-soluble) portions in its structure |
golgi apparatus | process and package the macromolecules such as proteins and lipids that are synthesized by the cell. |
lysosome | an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane. |
mitochondira | an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. |
ribosomes | A sphere-shaped structure within the cytoplasm of a cell that is composed of RNA and protein and is the site of protein synthesis. |
chloroplast | absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant. |
vacuole | a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid. |
vesicles | a large structure within a cell, or extracellular, consisting of liquid enclosed by a lipid bilayer. |
microtubules | a microscopic tubular structure present in numbers in the cytoplasm of cells, sometimes aggregating to form more complex structures. |
centrioles | a minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division. |
cilia | minute hairlike organelles, identical in structure to flagella |
flagella | a slender threadlike structure, especially a microscopic appendage that enables many protozoa, bacteria, spermatozoa, etc. to swim. |
nucleus | The large, membrane-bounded organelle that contains the genetic material, in the form of multiple linear DNA molecules organized into structures called chromosomes. |
rough endoplasmic reticulum (ER) | a network of tubular membranes within the cytoplasm of the cell, occurring either studded with ribosomes , involved in the transport of materials. |
endocytosis | the taking in of matter by a living cell by invagination of its membrane to form a vacuole |
exocytosis | a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane. |
simple diffusion | refers to a process whereby a substance passes through a membrane without the aid of an intermediary such as a integral membrane protein. |
facilitated diffusion | the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. |
phagocytosis | process by which a cell – often a phagocyte or a protist – engulfs a solid particle to form an internal compartment known as a phagosome. |
pinocytosis | the ingestion of liquid into a cell by the budding of small vesicles from the cell membrane. |
osmosis | the movement of water or other solvent through a plasma membrane from a region of low solute concentration to a region of high solute concentration. ( passive transport) |
hypertonic | one where the concentration of solutes is greater outside the cell than inside it. |
hypotonic | one in which the concentration of solutes is greater inside the cell than outside of it |
isotonic | two solutions having the same osmotic pressure across a semipermeable membrane. |
endosymbiosis | symbiosis in which one of the symbiotic organisms lives inside the other. |
cytokinesis | the cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells. |
cyclins | a family of proteins that control the progression of cells through the cell cycle by activating cyclin-dependent kinase (CDK) enzymes. |
mutagens | a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level. |
oncogenes | a sequence of deoxyribonucleic acid (DNA) that has been altered or mutated from its original form, the proto-oncogene. |