Combined Science key terms

Determining the order of the bases in a DNA molecule.

A broad classification group above kingdom. The three domains are Archaea, Bacteria and Eukaryota.

An allele expressed in the phenotype even when only one copy is present.

An allele expressed in the phenotype when one copy is present.

The amount of a drug given at one time.

A device worn by someone working with radiation to monitor their accumulated radiation dose.

A representation of electrons using different symbols to show which atoms the electrons originally came from.

A trial in which neither the participants nor the staff conducting the trial know who receives the drug and who receives the placebo during testing.

A covalent bond in which two atoms share two pairs of electrons.

A circulatory arrangement in which blood passes through the heart twice during one complete journey through the lungs and the rest of the body.

A transport system in which blood passes through the heart twice during one complete circuit: once through the lungs and once through the rest of the body.

The shape formed by two strands wound around each other.

A resistive force that opposes an object's motion through a fluid. Air resistance is drag acting in air.

Transmission of pathogens in droplets released during coughing or sneezing, which another person may breathe in.

A prolonged period of unusually low rainfall that can cause water shortages.

A substance used as a medicine to treat disease or relieve symptoms.

Able to be drawn into a wire.

A state in a closed system where the forward and reverse reactions continue at equal rates, so the amounts of reactants and products remain constant.

The reference electrical potential assigned to the Earth: 0 V.

The green-and-yellow-striped safety wire connected to an appliance’s metal case. It is at earth potential (0 V) and carries current only if there is a fault.

The interaction of a community of living organisms with the non-living parts of its environment.

A muscle or gland that brings about a response.

Bubbling or fizzing caused by a gas being produced in a liquid.

How effectively a drug produces its intended treatment effect.

The fraction of the total energy input that is transferred usefully by a device or system.

The liquid separated from sewage sludge during sedimentation, which still requires further treatment.

A change in shape that is reversed when the deforming forces are removed: the object returns to its original shape and length.