| Date | November 2017 | Marks available | 2 | Reference code | 17N.2.SL.tz0.3 |
| Level | Standard Level | Paper | Paper 2 | Time zone | time zone 0 |
| Command term | Outline | Question number | 3 | Adapted from | N/A |
Question
State one major storage site of triacylglycerol.
[1]
a.
Outline how a marathon runner produces ATP from fatty acids.
[2]
b.
Markscheme
adipose tissue ✔
skeletal muscle ✔
a.
fats are broken down during beta (β) oxidation ✔
fatty acids are broken down into acetyl CoA ✔
acetyl CoA enters the Krebs cycle ✔
b.
Examiners report
Overall, this question was mostly answered well; however, there was some confusion with the storage site of glucose or glycogen.
a.
Overall, this question was typically answered poorly. Many candidates were able to recall that ATP is produced through beta oxidation of fatty acids. However very few candidates were able to outline the how ATP is produced through beta oxidation (i.e. conversion of fatty acids to acetyl-CoA and the role of the Kreb’s cycle).
b.
