DP Biology (last assessment 2024)
Question 23M.1.HL.TZ2.5
| Date | May 2023 | Marks available | [Maximum mark: 1] | Reference code | 23M.1.HL.TZ2.5 |
| Level | HL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 5 | Adapted from | N/A |
5.
[Maximum mark: 1]
23M.1.HL.TZ2.5
The image shows a cell from the root tip of an onion (Allium cepa) (2n = 16) during late prophase of mitosis.
[Source: Davidson, M.W. and Molecular Expressions at Florida State University, n.d. Late prophase. [image online]
Available at: https://micro.magnet.fsu.edu/micro/gallery/mitosis/mitosis.html [Accessed 5 October 2021].]
How many chromatids are present in the cell?
A. 8
B. 16
C. 32
D. 64
[1]
Markscheme
C
Examiners report
The chromatids in the diagram of the root tip cell may not have been clear to count, but sufficient information was given in the question stem to deduce how many were present in the cell.