Biology Key Word Definitions (A)

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What is the abdomen?
The lower region of the body. In humans it contains the digestive organs, kidneys, etc.
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What is an active site?
The site on an enzyme where the reactants bind.
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What is active transport?
The movement of substances against a concentration gradient.and/or across a cell membrane, using energy.
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What is an adaptation?
A special feature that makes an organism particularly well suited to the environment where it lives.
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What is adult cell cloning?
The process in which the nucleus of an adult cell of one animal is fused with an empty egg from another animal. The embryo which results is placed inside the uterus of a third animal to develop.
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What is agar?
The nutrient jelly on which many microorganisms are cultured.
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What is an algal cell?
The cell of algae, single celled or simple multicellular organisms, which can photosynthesise but is not a plant.
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What is allele?
A version of a particular gene.
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What is alveoli?
The tiny air sacs in the lungs which increase the surface area for gaseous exchange.
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What are amino acids?
The building blocks of protein.
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What is amylase?
The enzymes made in the salivary glands and the pancreas which speeds up the breakdown of starch into simple sugars.
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What is an antibiotic?
A drug that destroys bacteria inside the body without damaging human cells.
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What is the aorta?
The main artery leaving the left ventricle carrying oxygenated blood to the body.
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What is asexual reproduction?
Reproduction that involves only one individual with no fusing of gametes to produce the offspring. The offspring are identical to the parent.
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What is the atria?
The small upper chambers of the heart. The right atrium receives blood from the body and the left atrium receives blood from the lungs.
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What is auxin?
A plant hormone that controls the responses of plants to light (phototropism) and to gravity (gravitropism).
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Other cards in this set

Card 2

Front

What is an active site?

Back

The site on an enzyme where the reactants bind.

Card 3

Front

What is active transport?

Back

Preview of the front of card 3

Card 4

Front

What is an adaptation?

Back

Preview of the front of card 4

Card 5

Front

What is adult cell cloning?

Back

Preview of the front of card 5
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