Biology

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What are pathogens?
Microorganisms that enter the body and cause diseases
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Explain how viruses replicate within your body
They replicate themseleves by invading your cells and producing many copies of themselves
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What are antigens?
Unique molecules on the surface of cells/pathogens etc
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Why are cultures of microorganisms grown at temperatures no higher than 25 degrees in school labs?
To prevent harmful pathogens from growing
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What is epidemic?
Big break out of disease
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What is pandemic?
When a disease spreads all over the world
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What is a vaccination?
A vaccination involves injecting small amounts of inactive microoganisms
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How can you prevent contamination?
Sterilise equipment before use e.g. petri dishes
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What might the inappropriate use of antibiotics lead to?
You body becoming resistant to it
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Why would a course of antibiotics not be suitable for treatment such as the flu?
Flu is a virus and antibiotics are not effective against viruses
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List four things that need to be kept constant with the body?
Temperature, blood sugar levels, water, ions
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What is a mutation?
A change in an organisms DNA
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Give three ways in which plant cells are different from animal cells.
Plant cells have extra features: cell wall, chloroplasts and a permanent vacuole
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Define diffusion.
The spreading out of particles, from an area of high concentration to an, area of low concentration
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What is the function of a red blood cell?
To carry oxygen; around the body
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Name the green substance present in chloroplast
Chlorophyll
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What is the nucleus?
Contains the geneteic material
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Name one cell that does not have a nucleus.
Bacteria cell
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Where is genetic material found in a bacterial cell?
Floating in the cytoplasm because, it has no nucleus
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Name 5 things an animal has
Cell membrane, mitochondria, ribosomes, nuclues, cytoplasm
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What is the function of the nucleus?
Controls activities of the cell and carries genetic information.
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What is the function of ribosomes?
To make the proteins
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What is the function of cytoplasm?
Where most chemical processes take place here
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What is the function of the cell membrane?
Controls what goes in and out of the cell
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What is the function of the mitochrondria?
Where most of the energy is released by respiration
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Which part is missing from human red blood cells? And why?
A nucleus; to carry more oxygen
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How are yeast cells different from bacterial cells?
They have a nucleus
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How are bacterial cells different from animal cells?
They have a cell wall and no nucleus
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Other cards in this set

Card 2

Front

Explain how viruses replicate within your body

Back

They replicate themseleves by invading your cells and producing many copies of themselves

Card 3

Front

What are antigens?

Back

Preview of the front of card 3

Card 4

Front

Why are cultures of microorganisms grown at temperatures no higher than 25 degrees in school labs?

Back

Preview of the front of card 4

Card 5

Front

What is epidemic?

Back

Preview of the front of card 5
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