Haringey Sixth Form CentreScience Department

October Biology Mock Exam

Name: A. Student

Duration: One hour

Marks out of 50

/50

You will need:Pencil, Ruler, Pen, Calculator

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The shape of the thing is changed so that it is the same as the shape of the enzyme and can now attach

Enalapril is a competitive inhibitor, as the concentration

of the substrate increases there is still an increase in reaction, so it must be competing rather than changing the enzymes active site

For most normal reactions an increase in temperature

leads to an increase in reaction rate because of the increased energy within the reaction, additional heal means more collisions of molecules. This is only half of the

story for enzyme reactions. At low temperatures there is little enzyme action, this could be down to few

collisions and little energy in the reaction media. There is an increase at around body temperature but then there is a drop off in productivity. This is because enzymes are

denatured (loss of tertiary structure) at extreme temperatures as the bonds between the polypeptide

weaken and break. This change in active site shape means fewer reactions take place

Hydrolysis

22

Sucrose is not a reducing sugar so I could do the benedicts test and look for colour change

22

The increased temperature provided additional starting energy for the reaction to begin with

The reaction can’t go any faster

They have the same shape so it will bind to the active site and prevent ethanol from binding - competitive inhibition

C12H22012

In the healthy man the lactose has been broken down (hydrolysed) by the enzyme lactase to glucose and galactose so over time the concentration of glucose in the blood will increase as this is digested

In the man with lactose intolerance he either has no lactase or it is not working properly so the lactose isn’t hydrolysed to glucose and galactose and there is no increase of glucose in the blood

Polypeptides

Peptide bond

Large moleculethe larger the molecule the more energy it can storeCompactThe more compact the molecule the more it can be stored

Because the muscles need energy

Biuret

Benedicts

Different colours

Villi

Hydrolysis

Peptide

End of the test!

Hydrogen

C12 H 22 O 11 (2)