Question 17N.2.SL.TZ0.05
| Date | November 2017 | Marks available | [Maximum mark: 7] | Reference code | 17N.2.SL.TZ0.05 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Compare and contrast, Discuss, State | Question number | 05 | Adapted from | N/A |
State one disaccharide and the two monomers from which it can be synthesized.
Disaccharide:
1:
Monomers:
1:
and 2:
[2]
a. disaccharide name
eg: lactose, glucose and galactose
b. both monomers that make up mpa
eg: maltose, glucose and glucose
eg: sucrose, glucose and fructose
Discuss the roles of the enzymes secreted by the pancreas during digestion.
[3]
a. amylase breaks down/catalyzes/hydrolyses starch to maltose
b. lipase breaks down/catalyzes/hydrolyses fats to fatty acids and glycerol
c. proteases/peptidases break down/catalyze/hydrolyze proteins into smaller
polypeptides/dipeptides/amino acids
Award [2] if all three enzymes and substrates named correctly and one further mark for all three products named
correctly.
Allow specific enzymes
Compare and contrast cis-fatty acids and trans-fatty acids.
[2]
a. both are unsaturated fatty acids
OR
both have two carbon atoms joined by a double bond
b. in cis-fatty acids the two H atoms are on the same side while in trans-fatty acids they are on opposite sides
OR
cis-fatty acids are healthier than trans-fatty acids
OR
cis-fatty acids have a lower boiling/melting point than trans
OR
cis-fatty acids have a kink «in the chain» but trans do not
Accept answer in an annotated diagram
