Combined Science key terms

The size of a quantity without its positive or negative sign.

A disease caused by protist pathogens and transmitted by mosquitoes, causing recurrent fever and sometimes death.

A cancerous growth whose cells invade neighbouring tissues and can spread in the blood to form tumours elsewhere.

The ability of a material to be hammered or bent into a different shape without breaking.

Able to be bent or hammered into shape without breaking.

Poor nutrition resulting from an insufficient, excessive or unbalanced intake of nutrients.

A measure of the amount of matter in an object, measured in kilograms (kg).

The total number of protons and neutrons in an atom’s nucleus.

A dull, non-shiny surface finish.

The sum of a set of values divided by the number of values.

The quantity of reactant used or product formed during a time interval divided by the duration of that interval.

A viral disease that causes fever and a red skin rash, spreads through inhaled droplets and can be fatal if complications arise.

A manufactured replacement heart valve that controls the direction of blood flow.

The middle value after the data have been put in order; for an even number of values, the mean of the two middle values.

A substance used to treat a disease or relieve its symptoms.

A substance or material through which a wave travels, such as air, water or glass.

A type of cell division in which genetic information is copied and the cell divides twice, producing four genetically different cells with half the original chromosome number.

The change of state from solid to liquid.

The temperature at which a substance changes from solid to liquid.

A long-lived lymphocyte formed during an immune response that enables a faster response to later exposure to the same antigen.

A repeating sequence of changes in the ovaries and uterus, involving egg maturation, ovulation and preparation of the uterus lining for pregnancy.

The shedding of the uterus lining at the start of a menstrual cycle, commonly called a period.

Plant tissue containing undifferentiated cells, found in growing regions such as root and shoot tips. Its cells retain the ability to differentiate throughout the plant’s life.

Tissue at the growing tips of shoots and roots containing unspecialised cells that divide and can differentiate into different types of plant cell.

The sum of all the chemical reactions in a cell or organism.

An element that reacts to form positive ions by losing electrons.

Obtaining a metal from a compound by a chemical reaction.