| Date | May 2016 | Marks available | 2 | Reference code | 16M.3.hl.TZ0.10 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Draw and State | Question number | 10 | Adapted from | N/A |
Question
Amino acids, shown in section 33 of the data booklet, can be combined to form polypeptides and proteins.
(i) Serine is a chiral amino acid. Draw both enantiomers of serine.
(ii) State the enantiomeric form of serine found in proteins.
Markscheme
(i)
Accept un-ionized or zwitterionic forms.
Accept any other correct representation which clearly indicates 3-dimensional structure at chiral centre.
Accept Fischer projections with the chiral carbon atom represented by crossing lines or shown as C.
(ii)
L
Examiners report
[N/A]
Syllabus sections
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