Glossary

Physical/living factors

Position on the surface of an enzyme molecule to which specific substrate molecules can bind

Feature of an organism that helps it to survive

Requires oxygen

A seasonal abundance of algae

Different forms of the same gene

Tiny sacs in lungs that form the gas exchange surface

Building block of a protein molecule

NH4 - a nitrogen-containing waste product of decomposition

Male sex organ within flower that produces pollen grain

Protein that is involved in defence in animals

Main artery that carries oxygenated blood away from the heart

Laboratory procedures designed to prevent contamination of pure cultures of microorganisms

Upper chambers of heart which receive blood from veins

Form the genetic code of DNA and mRNA

Region of planet with characteristic climate, flora and fauna

Chemical link between atoms in a molecule

Tiny blood vessels with walls one-cell thick where exchange of materials occur

Consumer which eats other animals

Letters that represent the names of the bases of DNA and mRNA

Flexible tissue forming C-shaped rings in the trachea to keep the airway open

A substance that speeds up a chemical reaction by reducing the energy required to start it.

Structural carbohydrate of which plant cell walls are composed

Replicated copy of chromosome visible during cell division