Question 23M.1A.SL.TZ1.10
| Date | May 2023 | Marks available | [Maximum mark: 1] | Reference code | 23M.1A.SL.TZ1.10 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 10 | Adapted from | N/A |
Sorbitol is oxidized to sorbose by the enzyme sorbitol dehydrogenase. The conversion rate was measured by monitoring sorbose concentrations. The graph shows the activity of sorbitol dehydrogenase at different pH values.
[Source: Tae-Su Kim, Gao Hui, Jinglin Li, Vipin C. Kalia, Karthikeyan Muthusamy,
Jae Kyung Sohng, In-Won Kim and Jung-Kul Lee, 2019.
Overcoming NADPH product inhibition improves D-sorbitol conversion to L-sorbose.
Scientific Reports, 9, p. 815. https://doi.org/10.1038/s41598-018-37401-0. Open Access.]
What can be deduced from these results?
A. There is no conversion of sorbitol to sorbose at a pH of 10.
B. At least 10 % of the product is transformed to substrate at a pH of 9.
C. The pH affects the rate of activity of the enzyme sorbitol dehydrogenase.
D. The amount of sorbose produced is not affected by the substrate concentration.
[1]
C