OCR BIOLOGY

microscopy, cells, organelles, gaseous exchange and the heart

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  • Created by: eleanor
  • Created on: 02-11-09 16:21
What is magnification?
the degree to which the size of an image is larger than the object itself
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What is resolution?
the degree to which it is possible to distinguish between two objects
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What is the resolution of an electron microscope?
0.1nm
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What is the resolution of a light microscope?
200nm
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What is the max. magnification of a TEM microscope?
x500,000
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What is the max. magnification of a SEM microscope?
x100,000
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What does the cytoskeleton refer to?
the network of protein fibres that give shape and structure to the cell
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What does the Golgi Apparatus do?
recieves proteins from the ER and modifies them, to be transported via vesicles
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A phosphate head is?
hydrophilic
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A fatty acid tail is?
hydrophobic
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What is a fluid mosaic?
the model of a cell membrane structure
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When a phospholipid molecule has a carbohydrate part attached to it, it is called a...
glycolipid
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When a protein molecule has a carbohydrate part attached to it, it is called a...
glycoprotein
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Why do good exchange surfaces have a thin barrier?
to reduce diffusion distances
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In humans, where in the lungs does gas exchange take place?
the alveoli
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How thick is the alveolus wall?
1 cell thick
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What is better, a double or single circulatory system?
double
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What is the cardiac cycle?
the sequence that happens in a heartbeat
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What starts the cardiac cycle?
The sinoatrial node
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Where is lymph held?
in the lymphatic system
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What does each subunit of a haemoglobin contain?
polypeptide chain and haem group
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Oxyhaemoglobin is formed when...
haemoglobin takes up oxygen
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The Bohr Effectrefers to a change in shape of the oxyhaemoglobin curve when...
carbon dioxide is present
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Other cards in this set

Card 2

Front

What is resolution?

Back

the degree to which it is possible to distinguish between two objects

Card 3

Front

What is the resolution of an electron microscope?

Back

Preview of the front of card 3

Card 4

Front

What is the resolution of a light microscope?

Back

Preview of the front of card 4

Card 5

Front

What is the max. magnification of a TEM microscope?

Back

Preview of the front of card 5
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goodboy7

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a spiffing test!

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