Groups of two or more atoms held together by chemical bonds

2 or more elements chemically combined

A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.

A logical, systematic approach to the solution of a scientific problem

A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level

Basic unit of life

A cell structure that controls which substances can enter or leave the cell.

Energy-requiring process that moves material across a cell membrane against a concentration difference

A type of protein that speeds up a chemical reaction in a living thing

A specific reactant acted upon by an enzyme

The part of an enzyme or antibody where the chemical reaction occurs.

Broken down to simple sugars

Energy-rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen.

Nutrients the body uses to build and maintain its cells and tissues

Diffusion of water through a selectively permeable membrane

A protein loosely bound to the surface of a membrane or to part of an integral protein and not embedded in the lipid bilayer.

A type of fat made by the body from saturated fat; a minor part of fat in foods.

the movement of substances across a cell membrane without the use of energy by the cell