Biology: Organisation: Key terms
Specialised Correct Ans - adapted for a particular purpose
Tissue Correct Ans - a group of cells that have a similar structure and function
Organ Correct Ans - a group of tissues gathered together to perform a particular
function
Organ system Correct Ans - a group of organs that all perform related functions
Catalyst Correct Ans - a substance that increases the rate of a chemical reaction
without being changed or used itself
Active site Correct Ans - area on an enzyme (lock) that a substrate molecule (key)
can fit into
Optimum Correct Ans - describes the conditions at which an enzyme works best
Lock and key theory Correct Ans - a model used to explain how enzymes work,
where the active site is the lock and the substrate is the key
Denature Correct Ans - when the shape of an enzyme is changed (by excessive
temperature or pH) so that it no longer functions
Protease Correct Ans - an enzyme used to break down proteins into amino acids
Lipase Correct Ans - an enzyme that breaks down fat into fatty acids and glycerol
Carbohydrase Correct Ans - an enzyme that can break down a carbohydrate
Amylase Correct Ans - an enzyme that breaks down starch
Bile Correct Ans - a fluid, produced by the liver and stored in the gall bladder that
emulsifies fat
Plasma Correct Ans - the clear fluid part of blood that contains various dissolved
substances, such as proteins and mineral ions
Haemoglobin Correct Ans - the red pigment in red blood cells, that carries oxygen
to the organs
Double circulatory system Correct Ans - the type of blood system found in
mammals, where the blood goes through the heart twice on each circuit of the body
