Question 23M.1.SL.TZ2.4
| Date | May 2023 | Marks available | [Maximum mark: 1] | Reference code | 23M.1.SL.TZ2.4 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 4 | Adapted from | N/A |
The diagram shows protein channels involved in the passive movement of a substance into the cell across the cell membrane.
What describes this movement?
A. Energy of ATP is used to transport substances into the cell.
B. Substances can move from areas of low to areas of high concentration.
C. The proteins ensure that movement of substances is only in one direction.
D. Net movement occurs until the concentrations in and out of the cell are equal.
[1]
D
This question concerned molecules moving passively through protein channels across a cell membrane. The question discriminated well. The correct response would have been better written as net movement, as movement of molecules still occurs when the concentrations on each side of the cell are equal. This has been added to the published paper.