Science Quiz / AQA GCSE Science A Biology Key Words

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Group of organisms that are similar and capable of producing fertile offspring.
Chemical made by a gland and carried in the blood to its target organ(s).
Medicinal drugs that reduce the amount of cholesterol made by the body.
A female sex hormone involved in regulating the menstrual cycle.
Your body’s system that fights infections, involving white blood cells and antibodies.
Very infectious pathogen. Can only reproduce inside a host cell.
All the chemical reactions going on in cells.
Small gap between neurones, or between a neurone and effector.
A plant hormone that causes shoots and roots to bend.
Organ such as a gland or muscle that responds to a stimulus.
Special protein in the body that can bind to a particular antigen and destroy a particular pathogen.
Epidemic that sweeps across continents or the whole world.
How quickly all the reactions are going on in cells.
Cell or sense organ that detects stimuli.
Plant growth response to a stimulus.
Organ or part of the body that responds to a particular hormone.
After you have made antibodies to a pathogen, you are able to fight off the pathogen in future without getting ill.
How you feel when you have a disease e.g. headache, nausea.
Sorting organisms into groups (e.g. kingdoms) according to their characteristics.
Cell specialised to carry electrical impulses. Nerve cells.
A substance that prevents conception (getting pregnant).
The scientist who came up with the theory of evolution through natural selection.
Monthly cycle in adult females.
A microorganism that can cause an infectious disease.
Release of a mature egg from an ovary.
Disease caused by not eating enough of a particular nutrient e.g. Scurvy from too little vitamin C.
Removing the nucleus from an unfertilised egg and replacing it with the nucleus from another cell taken from an adult organism. The new cell can develop into a new organism.
Medical procedure that involves injecting dead or inactive pathogens into a patient to stimulate the body to create antibodies.
Change in the structure of a gene. This may results in a different characteristic being developed.
Produce a hormone in special cells of a gland.
The survival of organisms better adapted to their environment.
Special protein on the surface of pathogenic cells. Bind matching antibodies during the immune response.
Hormones produced in the sex organs (ovaries and testes).
Fast automatic response of the body to a potentially dangerous stimulus, coordinated by the spinal cord.
Single-celled microorganism, 1-5 μm long. They do not have DNA enclosed inside a nucleus.
Fertilisation carried out outside the body, so the egg and sperm join in a glass dish to form an embryo that is injected back into the women’s uterus.
Small organisms, seen under a microscope e.g. bacteria and viruses.
Nerves carrying information from sense organs in the body to the CNS, and from the CNS to effectors.
Change in the environment, such as a temperature change, that you respond to.
The scientist who believed in the inheritance of acquired characteristics e.g. the giraffes’ stretched neck.
Diet that has the right amount of proteins, fats, carbohydrates, vitamins, minerals, water and fibre, and gives you enough energy.
Sudden outbreak of a disease that affects many people within a country.
The ability some bacteria develop meaning that an antibiotic will not kill them anymore.
A female sex hormone involved in maintaining the uterus lining.
Drug that stops you feeling pain e.g. paracetamol.
Biological catalyst made of protein. They speed up chemical reactions in living organisms.
Being very overweight.
Chemical, usually made by fungi or bacteria, that can be used as medicine to kill other fungi or bacteria.
Structure inside an organism that makes a useful substance, often a hormone.

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