n. growth gland that lies in front of the trachea and has two lobes a substance that causes an allergic reaction the bones in the head that hold the teeth and help form the facial structure the mechanisms which increase the quantity, size or mass of an organism
n. carboxyl group daily activity cycle in many organisms caused by a 24-hours interval part of the eye that helps to focus light on the retina a method of asexual reproduction -COOH group
n. cannabis substance that is taking part in a chemical reaction nonrandom mating in which individuals engage in mating having more traits incommon than in random mating drug which affects the central nervous system and cause people to see or experience unusual things outside the range of normal perception a drug also known as marijuana
n. mutation one-celled organisms that don't have a cell nucleus and reproduce by spore formation or fission a change in a chromosome or a gene white blood cell with an immune role found in the lymphatic system muscle fibers in the heart receiving heartbeat impulses
n. mole fraction used to detect the end-point during titration a steroid that plays an important part in metabolism a double membrane surrounding the lungs; the inner membrane is attached to the lungs; the outer membrane is attached to the thoracic cavity ratio of the moles of one compound of a system to the total moles of all compounds present
n. sterility inability to reproduce an unproven idea or generalization the organs of smell plant life
n. buffer solution mixture of a weak acid and its salt or of a weak base and its salt the middle ear period of life encompassing childhood; adolescence and early adulthood before middle age; boy; young man bundle of nerve fibers
n. X-linked disease protein made by white blood cells, in response to a particular antigen attack, in order to make the antigen harmless compound made from plants containing carbon, hydrogen and oxygen valve that controls blood flow between the left atrium and the left ventricle in the heart characteristic that is controlled by a gene carried on the X chromosome
n. chemical equation the removal of hydrogen from a molecule any reaction occurring between atoms or compounds can be written with the reactants on the left and the products on the right separated by arrows showing the direction of the reaction a specific carrier transports molecules through the cell membrane organ that exchanges gases between the blood and the air
n. chromium the breakdown of food to release energy into cells method of communication one of the longitudinal contractile elements of a muscle cell occuring in a skeletal or cardiac muscle Group 2 metallic element
