DP Chemistry (last assessment 2024)
Question 20N.3.hl.TZ0.6b
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.hl.TZ0.6b |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
20N.3.hl.TZ0.6b
(b)
Proteins are polymers of amino acids.
Glycine is one of the amino acids in the primary structure of hemoglobin.
State the type of bonding responsible for the α-helix in the secondary structure.
[1]
Markscheme
hydrogen/ bonding «between amido hydrogen and carboxyl oxygen atoms» ✔
Examiners report
A majority stated that hydrogen bonding is the bonding responsible for the alpha-helix in the secondary structure.
