Biology Key Word Definitions (P) 0.0 / 5 ? BiologyBiology Key Word Definitions (P)GCSEAQA Created by: Atlanta and JacobCreated on: 15-02-16 16:24 What is a pancreas? An organ that produces the hormone insulin and many digestive enzymes. 1 of 24 What is a pandemic? When more cases of a disease are recorded than normal in a number of different countries. 2 of 24 What is a parasite? An organism which lives in or on other living organisms and gets some or all of its nourishment from this host organism. 3 of 24 What is partially permeable? Allowing only certain substances to pass through. 4 of 24 What is a pathogen? A microorganism which causes disease. 5 of 24 What is perfluorocarbon? Chemical which can be used as artificial blood. 6 of 24 What is permanent vacuole? A space in the cytoplasm filled with cell sap which is there all the time. 7 of 24 What is pesticide? Chemical that kills animals. 8 of 24 What is phloem? The living transport tissue in plants which carries sugars around the plant. 9 of 24 What is pigment? A coloured molecule. 10 of 24 What is phototropism? The response of a plant to light, controlled by auxin. 11 of 24 What is a pituitary gland? A small gland in the brain which produces a range of hormones controlling body functions. 12 of 24 What is a placebo? A substance used in clinical trials which does not contain any drug at all. 13 of 24 What is plasma? The clear, yellow liquid part of the blood which carries dissolved substances and blood cells around the body. 14 of 24 What is a platelet? A fragment of cell in the blood which is vital for the clotting mechanism to work. 15 of 24 What is polydactyly? A genetic condition inherited through a dominant allele which results in extra fingers and toes. 16 of 24 What is positive pressure? A system where the external pressure is higher than the internal pressure. 17 of 24 What is a predator? An animal which preys on other animals for food. 18 of 24 What is progesterone? Female sex hormone used in the contraceptive pill. 19 of 24 What is protease? An enzyme which breaks down proteins. 20 of 24 What is protein synthesis? The process by which proteins are made on the ribosomes based on information from the genes in the nucleus. 21 of 24 What is a pulmonary artery? The large blood vessel taking deoxygenated blood from the right ventricle of the heart to the lungs. 22 of 24 What is a pulmonary vein? The large blood vessel that brings blood into the left atrium of the heart from the lungs. 23 of 24 What is a pyramid of biomass? A model of the mass of biological material in the organisms at each level of a food chain. 24 of 24
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