DP Chemistry (first assessment 2025)
Question 23M.2.HL.TZ2.12
| Date | May 2023 | Marks available | [Maximum mark: 3] | Reference code | 23M.2.HL.TZ2.12 |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Identify | Question number | 12 | Adapted from | N/A |
12.
[Maximum mark: 3]
23M.2.HL.TZ2.12
Identify three structural differences between DNA and RNA. Use section 34 of the data booklet.
| DNA | RNA |
| ................................................ | ................................................ |
| ................................................ | ................................................ |
| ................................................ | ................................................ |
[3]
Markscheme
| DNA | RNA | |
| thymine | AND | uracil ✓ |
| deoxyribose | AND | ribose ✓ |
| double stranded | AND | single stranded ✓ |
Accept “additional methyl/CH3 group” for DNA OR “one less methyl group” for RNA for M1.
Accept “one less hydroxyl/OH group” for DNA OR “additional hydroxyl/OH group” for RNA for M2.