Biology Glossary

2. The increases in cell size and number that take place during the life history of an organism.
3. An organism living in, on, or with another organism in order to obtain nutrients, grow or multiply often in a state that directly or indirectly harms the host.
8. Red fluid in the body that carries oxygen and important substances.
10. Any of the alternative forms of a gene that may occur at a given locus.
11. Basic structure that is found in all life, it’s a molecule, and it’s made up of smaller components, called amino acids.
12. The order in which subunits appear in a chain, such as nucleotide bases in a DNA or RNA molecule.
14. A section of DNA that contains the information for making a specific protein and is the functional and physical unit of heredity.
15. Organic compound and essential nutrient that the body needs to get from food.

1. A special type of cell division of germ cells in sexually reproducing organisms used to produce the gametes, such as sperm or egg cells.
4. The process by which a species becomes fitted to its environment; it is the result of natural selections acting upon heritable variation over several generations.
5. A blood clot that forms on the wall of a blood vessel or in the heart when blood platelets, proteins, and cells stick together.
6. Making a copy, a likeness, and thereby providing for the continued existence of species.
7. Observable physical properties of an organism; these include the organism's appearance, development, and behavior.
9. A long, thin part similar to a tail, used for movement by some cells, bacteria, and other very small organisms.
13. Part of the metabolism that is responsible for breaking down or degrades complex molecules down into smaller ones.