DP Chemistry (last assessment 2024)
Question 19N.3.hl.TZ0.13a
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.hl.TZ0.13a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | List | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19N.3.hl.TZ0.13a
DNA, deoxyribonucleic acid, is made up of nucleotides.
(a)
List two components of nucleotides.
[1]
Markscheme
Any two correct for [1]:
pentose «sugar»
OR
deoxyribose ✔
phosphate/phosphato «group»/residue of phosphoric acid ✔
NOTE: Accept “−OPO32−/−OPO3H−/−OPO3H2” but not “PO43−”.
«organic» nitrogenous base
OR
nucleobase
OR
nucleic base
OR
purine
OR
pyrimidine ✔
NOTE: Accept the four bases together: “adenine/A, guanine/G, cytosine/C, thymine/T”.
Accept names or formulas.
