1. Haringey Sixth Form Centre
Science Department
October Biology Mock Exam
Name: A. Student
Duration: One hour
Marks out of 50
/50
You will need:
Pencil, Ruler, Pen, Calculator

2. X
X
X
X
X

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

4. 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

5. Hydrolysis
22
Sucrose is not a reducing sugar so I
could do the benedicts test and look for
colour change

6. 22
The increased temperature provided
additional starting energy for the
reaction to begin with

7. 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

8. 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

9. 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

10. Large molecule
the larger the molecule the more
energy it can store
Compact
The more compact the molecule the
more it can be stored
Because the muscles need energy
Biuret
Benedicts

11. Different colours
Villi

12. Hydrolysis
Peptide

13. Hydrogen
End of the test!

16. C12 H 22 O 11
(2)