| Date | May 2021 | Marks available | 1 | Reference code | 21M.2.SL.tz0.3 |
| Level | Standard Level | Paper | Paper 2 | Time zone | time zone 0 |
| Command term | Describe | Question number | 3 | Adapted from | N/A |
Question
Outline the functions of protein.
[2]
a.
Describe essential amino acids.
[1]
b.i.
Identify a source of essential amino acids.
[1]
b.ii.
Markscheme
protein:
used for muscle tissue / structures in the body ✔
components/amino acids are used for making enzymes ✔
hormonal communication (insulin eg must be proteinaceous) / produce hormones✔
cellular transport ✔
support the body's immune response ✔
<in extreme circumstances> it can be used as an energy source ✔
Accept any other valid responses.
a.
cannot be synthesized by the human body and must be obtained from diet ✔
b.i.
meat / fish / processed soybean / bread / protein bars ✔
b.ii.
Examiners report
Generally done well by most.
a.
Generally done well by most.
b.i.
Generally done well by most.
b.ii.
