Download Unit B2, B2.5.2 Mark Scheme

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Unit B2, B2.5.2 Mark Scheme
Enzymes
1.
(a)
(i)
(ii)
mouth or saliva
accept small intestine
1
starch
1
maltose or glucose
do not credit sugar
1
small intestine
accept duodenum or jejunum
do not credit intestines
1
fats or lipids or oils 2
fatty acids or glycerol
(b)
(i)
salivary
accept pancreas
1
(ii)
pancreas
accept small intestine or ileum
1
[8]
2.
(a)
microorganisms
1
(b)
(i)
proteases
clear indications of correct answer
1
(ii)
amino acids (both words)
clear indications of correct answer
1
(i)
14
1
(ii)
mark independently
(c)
(iii)
enzyme Z
clear indication of correct answer
1
takes least time (to pre-digest protein) / works fastest
allow only 7 minutes / less time / faster
do not allow works best
1
temperature
1
pH
1
[8]
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