Biology 2

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what is the cell membrane?
it controls what enters and what leaves the cell e.g. oxygen
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what is the nucleus?
a large structure that contains DNA-and then instructions for building and working the cell
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what is the cytoplasm?
a jelly like substance that fills the cell ; many reactions take place here
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what are mitochondria?
tiny structures where respiration takes place, releasing energy for cell processes
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what are chloroplasts?
they are the structures where photosynthesis take place to make food for the plant (plants)
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what is the cell wall for?
the cell wall is made of cellulose and is tough so that it helps support the cell and keep it in shape (plants)
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what is the central vacuole?
it contains cell sap to keep the plant cell rigid (plants)
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BACTERIA
BACTERIA
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what is bacteria?
a simple cell structure like animal and plant cells they have cell membrane surrounding the cytoplasm but do not have a nucleus
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what is inside bacteria?
a single loop of chromosomal DNA lies free in the cytoplasm. flagellum . cell wall. plasmid DNA (additional genes)
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when was microscopes invented?
350 years ago
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what does a light microscope do?
it uses light to magnify objects, it greatest possible magnification is x2000
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what is an electron microscope?
uses electrons to view an object x10 million better than light microscope
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Formula for magnification
magnification of eyepiece X magnification of objective
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Other cards in this set

Card 2

Front

what is the nucleus?

Back

a large structure that contains DNA-and then instructions for building and working the cell

Card 3

Front

what is the cytoplasm?

Back

Preview of the front of card 3

Card 4

Front

what are mitochondria?

Back

Preview of the front of card 4

Card 5

Front

what are chloroplasts?

Back

Preview of the front of card 5
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