Enzyme Reactions

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Lauren M O'Shea
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#1
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#1
How do enzyme reactions work?
i had an exam question i didn't really understand

The enzyme phenylalanine hydroxylase converts its substrate, phenylalanine,
into the product, tyrosine. Using the information shown in the diagram and
your knowledge of the mechanism of action of enzymes, suggest how this
reaction takes place.

could anyone explain this?

thank you ! x
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Liberty.
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#2
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#2
What board are you? And is this AS or A2?
It's probably something a lot more simple then what you're thinking, which is normally my problem
I can imagine it'll be along the lines of:
Lowers activation energy
Substrate complementary shape to active site
Enzyme-substrate complex formed
Catalyses addition of hydroxyl?

They don't expect you to have any knowledge of the chemicals or any other 'scary' information they chuck in there.
So I'd just regurgitate all of your enzyme knowledge and you'll probably cover most, if not all, the marking points

It's always simpler than you think this is why I suck at biology, so I'm probably not the best person to be giving advice...
Check the mark scheme?
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carrotstar
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#3
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(Original post by Lauren M O'Shea)
How do enzyme reactions work?
i had an exam question i didn't really understand

The enzyme phenylalanine hydroxylase converts its substrate, phenylalanine,
into the product, tyrosine. Using the information shown in the diagram and
your knowledge of the mechanism of action of enzymes, suggest how this
reaction takes place.

could anyone explain this?

thank you ! x
I expect it will be looking for marking points such as:
The specifity of the complementary active site to only phenylalanine
The substrate collides and fits into the active site
The enzyme breaks down the substrate into the product
The product is released
The process repeats itself as enzymes can be used over and over again
You could also mention something about the enzyme's tertiary structure holding the shape of the active site, if that is covered by your course.

Hope that helps, but there should be a description a bit like that, in steps, in your textbook or revision guide. You can also gauge the detail required by the number of marks awarded for the question.

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Lauren M O'Shea
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#4
Report Thread starter 8 years ago
#4
Thank you very much!

i'm currently doing a mind map on enzymes so i'll put some of that answer on my mind map

many thanks
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