Biology Key Word Definitions (B)

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What is bacteria?
Single-celled microorganisms that can reproduce very rapidly. Many bacteria are useful, e.g. gut bacteria and decomposing bacteria, but some cause disease.
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What is a bacterial colony?
A population of billions of bacteria grown in culture.
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What is a biconcave disc?
The shape of the red blood cells - a disc which is dimpled inwards on both sides.
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What is bile?
Yellowy-green liquid made in the liver and stored in the gall bladder. It is released into the small intestines and emulsifies fats.
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What is biofuel?
Fuel produced from biological material which is renewable and sustainable.
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What is biogas?
Methane produced by the fermentation of biological materials.
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What is the bladder?
The organ where urine is stored until it is released from the body.
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What does breathe mean?
The physical movement of air into and out of the lungs. In humans this is brought about by the action of the intercostal muscles on the ribs and diaphragm.
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What is the breathing system?
The organ system involved in breathing: the ribs, intercostal muscles, diaphragm as well as the lungs and the tubes which bring air into the body from the outside.
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Card 2

Front

What is a bacterial colony?

Back

A population of billions of bacteria grown in culture.

Card 3

Front

What is a biconcave disc?

Back

Preview of the front of card 3

Card 4

Front

What is bile?

Back

Preview of the front of card 4

Card 5

Front

What is biofuel?

Back

Preview of the front of card 5
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