AQA AS Biology - Unit 1 Biology and Disease Revision

This provides a quick quiz for the topics of causes of disese, enzymes and the digestive system and cells and movement in and out of them

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  • Created by: Vicky
  • Created on: 30-11-11 15:46
What is a pathogen?
A microorganism that causes disease
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Why are the respiratory and digestive systems the most common sites of entry for pathogens?
Diffusion takes place here - so they have a large surface area, have a good blood supply and are thin so that the pathogens can easily attach to them and penetrate
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How do pathogens cause disease?
by damaging host tissues and producing toxins
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How is a person defined as being infected?
If a pathogen gains entry to the host and colonises its tissue
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What is risk?
A measure of the probability that damage to health will occur as a result of a given hazard
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Lifestyle factors of cancer include:
smoking, diet, exposure to sunlight, aerobic exercise
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How is the stomach adapted to prevent the enzymes it produces from digesting the surface of the stomach?
By secreting mucus
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Why do large molecules often contain carbon?
Carbon atoms readily link to each other to form a chain
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What substance is used for the test for starch?
dissolved potassium iodide solution - turns from yellow to blue - black
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What determines the structure of a 3-D protein?
The sequence of amino acids
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Name one limitation of the lock and key model?
The enzyme, the lock, is considered to be a rigid structure
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Why are enzymes effective in small quantities?
They are not used up in the reaction and so can be used repeatedly
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When studying organelles, why do they need to be kept in a buffered solution?
To maintain a constant pH
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Why can't the theoretical resolving power of an electron microscope always be achieved?
As it is dependent on the quality of the specimen
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What does the Golgi Apparatus do?
Adds carbohyrates to proteins to form glycoproteins, transports, modifies and stores lipids
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How large is the 80s type of ribosome and where is it found?
Around 25nm in diameter and found in eukaryotic cells
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In which process are ribosomes important?
Protein synthesis
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What's the differnece between a tryglyceride and a phospholipid?
Tyglycerides have 3 fatty acids and no phosphate group and phospholipids have 2 fatty acids and 1 phosphate group
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What affects the rate of diffusion?
Thickness of exchange surfance
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When is a plant cell said to be plasmolysed?
When the protoplast pulls away from the cellulose cell wal
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Name one structure of a prokaryotic cell that isn't present in a eukaryotic cell
flagellum
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How can cholera infect people?
Eating organisms that have fed on untreated sewage
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Other cards in this set

Card 2

Front

Why are the respiratory and digestive systems the most common sites of entry for pathogens?

Back

Diffusion takes place here - so they have a large surface area, have a good blood supply and are thin so that the pathogens can easily attach to them and penetrate

Card 3

Front

How do pathogens cause disease?

Back

Preview of the front of card 3

Card 4

Front

How is a person defined as being infected?

Back

Preview of the front of card 4

Card 5

Front

What is risk?

Back

Preview of the front of card 5
View more cards

Comments

Kirsten

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Very helpful! Thank! :)

Rochelle Smith

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Q.12 You don't boil the Benedict's test..you warm it gently

ex-Andy

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Thanks

Haji

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How can i download these notes as a pdf file for my phone

Mirte

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Good quiz! On some of the earlier questions its quite easy to see which one is the answer but great resource, 30/32 ;)

Mirte

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Good quiz! On some of the earlier questions its quite easy to see which one is the answer but great resource, 30/32 ;)

Ruby

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Good quiz. But just wished the correct answer was shown on a wrong question :)))

Swallowtail

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A popular quick quiz on causes of disese, enzymes and the digestive system, cells and movement in and out of them.  Have a go at these questions as a quick check of your knowledge. Combine them with some other Q & A resources to set up a series of tests to extend your revision.

TrillMfKai

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what kind of traaaaaaash is this website

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