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Summary question
Pg.32 topic 2.6
What is a catalyst?
A substance that alters the rate of a chemical reaction without undergoing
permanent change

Why are enzymes effective in tiny quantities?
They are not used up in the reaction and so can be used repeatedly.

Explain why changing one…

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Distinguish between a competitive and a non-competitive inhibitor.
Competitive inhibitors occupy the active site of an enzyme while non-competitive
inhibitors attach to enzyme at a site other than the active site.

An enzyme-controlled reaction is inhibited by substance. Suggest a simple way in
which you could tell whether substance…

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Explain why glucagon will only bind to one particular type of receptor molecule. [2]
Protein molecules have a different sequence to form a different tertiary shape (1)
The receptor molecule has a specific complimentary shape to protein to bind to. (1)

Suggest why glucagon is able to bind to…

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Changes shape of the enzyme (1)
Less successful collision and less enzyme-substrate complex form (1)

Some people are lactose intolerant because they don't produce enough lactase
enzymes in the small intestine. Lactose accumulates in the intestines and either
remains unhydrolysed or is converted to other soluble substances be bacteria…


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