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14 Cards in this Set
- Front
- Back
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abiotic |
describes the non-living parts of an organism's environment |
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absorption |
the process that occurs when food molecules are tiny enough to pass through the wall of the small intestine and into the blood vessels |
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active transport |
the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from an area of lower concentration to an area of higher concentration |
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adaptive radiation |
the process by which several populations evolve from an original parent population, each adapted to different niches |
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AIDS |
An immunodeficiency disease, caused by HIV in humans |
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algae |
Plant-like organisms, often single-celled, that carry out photosynthesis |
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alleles |
The two different versions of a gene for a particular trait |
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alveoli |
Microscopic air sacs in the lungs; their lining act acts the respiratory surface |
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amino acids |
organic compounds that are the building blocks of proteins |
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amnion |
The membrane that surrounds, protects, and holds in a fluid that cushions the embryo |
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antibiotic |
a chemical that kills specific microorganisms; frequently used to combat infectious diseases |
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antibodies |
Molecules that individuals produce as a defense against foreign objects the body; antibodies bind to specific antigens |
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antigens |
Proteins on a foreign object that stimulate the immune system to produce antibodies |
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