AQA GCSE Combined Science Trilogy key terms

A neurone within the central nervous system that connects sensory and motor neurones.

The extent to which an energy resource can provide a predictable supply when needed.

To start burning with a flame again.

An energy resource that is being, or can be, replenished as it is used.

A natural resource that is replenished as it is used, provided it is managed appropriately.

The group of atoms that occurs repeatedly along a polymer molecule.

A group of atoms that occurs repeatedly along a polymer molecule.

A sample that reflects the relevant characteristics of the population being studied.

The insoluble solid left on the filter paper after filtration.

A measure of how strongly a component opposes the flow of charge, calculated using $R = V/I$ and measured in ohms ($\Omega$).

A force that opposes motion, such as friction or air resistance.

A component that limits current; a fixed resistor has a resistance that is not adjustable.

The smallest change in the quantity being measured that an instrument can display or distinguish.

Chemical reactions in cells that transfer energy from glucose; aerobic respiration releases carbon dioxide and water.

A health problem affecting the airways or lungs and making breathing more difficult.

The single force that has the same effect as all the forces acting together on an object.

Using a product again without processing its material into a new product.

A membrane process in which pressure forces water through a partially permeable membrane, separating it from dissolved salts.

The reaction that converts products back into the original reactants, read from right to left in a chemical equation.

A reaction in which products can react to form the original reactants, so the reaction can occur in both directions.

The distance travelled by a substance, measured from the origin to the centre of its spot, divided by the distance travelled by the solvent from the origin. It has no unit.

A small sub-cellular structure where proteins are made.

A shallow, transparent-bottomed tank used to produce and observe water waves.

The chance that harm will occur, rather than a guarantee that it will occur.

Something that increases the likelihood of developing a disease.

A specialised root cell with a long extension that increases its surface area for absorbing water and mineral ions from soil.

A fungal disease of roses that causes purple or black spots on leaves, which often turn yellow and fall early, reducing photosynthesis and growth.

A bacterial infection spread by swallowing Salmonella bacteria in contaminated food, causing fever, abdominal cramps, vomiting and diarrhoea.