DP Chemistry (first assessment 2025)

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Question 23M.2.SL.TZ2.6a

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.SL.TZ2.6a
Level SL Paper 2 Time zone TZ2
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 3]
23M.2.SL.TZ2.6a
(a)

Describe the interactions between amino acids occurring at the primary, secondary and tertiary levels within a protein.

Structure Level Interactions between amino acids
Primary ...........................................................
Secondary ...........................................................
Tertiary ...........................................................

[3]

Markscheme
Structure Level Interactions between amino acids
Primary covalent bonding
OR
peptide bond
OR
amide bond ✓
Secondary hydrogen bonding ✓
Tertiary interactions between R groups/side chains
OR
ionic/electrostatic «attraction»
OR
hydrogen bonding
OR
hydrophobic interactions
OR
disulfide bridges
OR
London/dispersion/van der Waals/«instantaneous» induced dipole-induced dipole ✓

 

Do not accept “amino acid sequence” for M1.

Do not accept “alpha helix” OR “beta sheets” for M2.

Accept “covalent bonding” for M3.