A unit used to measure and compare the amount of heat energy in a substance; the amount of heat needed to raise the temperature of 1 gram of water 1 degree Celsius.
A type of nutrient, made up of simple and complex sugars, used for the production of energy.
Meat-eating animals, which get their energy from plants indirectly.
The number of individuals of a given species that can be supported by a given ecosystem.
Chemicals that alter (i.e., reduce) the rates of reactions.
The basic unit of structure and function of all living things.
The reproductive process by which one cell divides to become two new cells.
The outer covering of the cell which regulates the flow of materials into and out of the cell.
The chemical process that releases the energy from food; takes place inside mitochondria.
The structure in plants that contains cellulose and which encloses the entire cell.
The link that joins one atom to another atom, and which stores energy, in a molecule.
A change that results in the formation of one or more new substances; a chemical reaction.
The energy stored in certain substances because of their chemical makeup.
The way a particular element, or substance, reacts chemically with another substance and undergoes a change to a new substance.
A change that results in the formation of one or more new substances and which either releases or uses energy; a chemical change.
The threadlike structures inside a cell's nucleus that contain the genetic information.