OCR AS Biology Unit 2 (F212) revision notes on enzymes to complete with presentation

This word document is notes on enzymes for people studying A level as biology unit 2 (F212). It matches up to a presentation that i have already put on here and as you go throught the presentation you can fill in the gaps. Or, if you're feeling adventuros you can do it without, please yourself. 

This resourse is for students studying AS OCR biology unit 2 (F212) 
(I'm only saying this a billion times becuase i always find it annying when people dont put what exam board it is so yay no guess work)

Thank you and good luck with revision.  

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  • Created by: Faye
  • Created on: 15-04-13 20:13

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Page 1

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What is an enzyme?

They are ............................................... (have unique
shapes)
They act as a catalyst
They have active sites which fit specific
................................
They are affected by PH and temperature

What affects the activities of an enzyme?

PH

A PH that is too .................. for an enzyme causes the H+…

Page 2

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.............. temperatures reduces the rate of reaction because the molecules have less
kinetic energy which reduces the amount of .................................... the particles have
therefore reduces the rate of reaction.
.............. temperatures give the enzyme too much ............................................ which
breaks the ionic and hydrogen bonds in the structure causing it to…

Page 3

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Rate of
reaction





concentration of substrate

Inhibitors

Competitive ­ They have a similar shape to the
substrate and bind to the active site preventing the
............................ from binding and therefore
decreasing the rate of reaction.








Noncompetitive This attaches to the enzyme, away from the active site causing the
shape of…

Page 4

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Metabolism

Used to control enzyme reactions
The last product is an competitive inhibitor of the first enzyme








The uses of enzymes

Page 5

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Natural
Chemical reactions
Digestion
Protection ­white blood cells ­ lysins
Commercial
Detergents
Food and drink
Advantages
Specific ­ no by products
Re usable
Less energy, hear or pressure required

Questions:

1) Define what a catalyst is.







2) State the 4 factors that can affect the activities of enzymes.







3) What…

Page 6

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5) Draw a graph to show the effect of increasing the substrate concentration for a fixed
enzyme concentration.






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