B2

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  • Created by: frankie
  • Created on: 26-04-13 17:45
What are the features of ainmal cells?
cell membrane, cytoplasm, ribosomes, mitochondria and the nucleus
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where do most chemical reactions take place in the cell?
in the cytoplasm
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What takes place in the ribosomes?
The making of proteins
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where do respiration reactions take place in animal cells?
in the mitochondria
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Other than the main 5 features what do plant (and algal) cells contain?
a cell wall, chloroplasts and a permanent vacuole
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what happens in chloroplasts? (green parts of plants)
photosynthesis (as they contain chlorophyll)
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How and what does the permanent vacuole do?
keeps cell rigid (as it contains lots of sap)
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Why don't root cells contain chloroplasts?
They are underground and therefore don't photosynthesise
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What are special features of bacteria cells?
Plasmids and flagellum
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What do plasmids do?
contain extra genetic material
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what do flagellum do?
Lah about to bring about movement
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what is different about the DNA in bacteria cells?
Its not contained in a nucleus but found (usually circular) freely in the cytoplasm
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What is different about yeast cells?
They are single-celled organisms that only consist of a nucleus, cytoplasm, cell and membrane and a cell wall
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How does yeast reproduce?
By asexual budding (when a call splits in two to form new cell)
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How does having lots of oxygen available affect yeast cells?
They use aerobic respiration. They use oxygen to break down sugar to provide energy. producing water and carbon dioxide as waste
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How does having not very much oxygen available affect yeast?
They se unaerobic respiration. They break down sugar very solwly, producing ethanol and carbon dioxide as waste (this is fermentation)
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What are specialised cells?
Cells that have differentiated so they can perform a specific function
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What is an example of a speciallised cell?
Sperm cells. they have long tails used for large amounts of movement
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what is diffusion?
The overall movement of particles from an area to HIGH concentration (lots) to an area of LOW (few) concentration
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what is diffusion important to cells?
small substances e.g oxygen can diffuse through a cell membrane however big particles e.g starch can't due to its size
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What is the main factor that affects the rate of diffusion?
The difference in concentration. Bigger difference = faster reaction
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What is a tissue?
A group of cells (with similar structures) working together to perform a specific function (e.g muscular tissue which contracts)
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What is an organ?
A collection of different tissues working together to carry out important functions in the body
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What is an organ system?
A group of organs that perform specific fuctions (e.g respiratory system)
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what is the sequence of multicellular organisms?
cells - tissues - organs - organ systems - organism
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What is the digestive system an example of?
a system where substances ae exchanged with the environment
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What are the main plant organs?
stem, leaf, root
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What do the roots of a plant do?
anchors plants and obtains water and minerals from soil
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Other cards in this set

Card 2

Front

where do most chemical reactions take place in the cell?

Back

in the cytoplasm

Card 3

Front

What takes place in the ribosomes?

Back

Preview of the front of card 3

Card 4

Front

where do respiration reactions take place in animal cells?

Back

Preview of the front of card 4

Card 5

Front

Other than the main 5 features what do plant (and algal) cells contain?

Back

Preview of the front of card 5
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Comments

Ravin Patel

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very effective. i have gone over the course twice and this has helped me with confidence and the odd bits of information. thank you :-)

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