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Biology
Bio terms
11
Biology
9th Grade
11/04/2013

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Term
Atom
Definition
The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule.
Term
Nucleus
Definition
The central part of most cells that contains genetic material and is enclosed in a membrane.
Term
Electron
Definition
A very small particle of matter that has negative charge of electricity and that travels around the nucleus of an atom.
Term
Element
Definition
One of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances.
Term
Isotypes
Definition
Any of the categories of antibodies determined by their physicochemical property and antigenic characteristics that occur in all individuals of a species.
Term
Compound
Definition
A substance formed by the chemical combination of two or more elements in definite proportions.
Term
Ionic Bond
Definition
A chemical bond formed between oppositely charged species because of their mutual electrostatic attraction.
Term
Ion
Definition
An atom or group of atoms that has a positive or negative electric charge from losing or gaining one or more electrons.
Term
Covalent Bond
Definition
A chemical bond formed between atoms by the sharing of electrons.
Term
Molecule
Definition
The smallest possible amount of a particular substance that has all the characteristics of that substance.
Term
Van Der Waals Forces
Definition
A slight attraction that develops between oppositely charged regions of nearby molecules.
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