| Date | May 2017 | Marks available | 2 | Reference code | 17M.3.hl.TZ1.17 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | 17 | Adapted from | N/A |
Question
Vision is dependent on retinol (vitamin A) present in retina cells. Retinol is oxidized to the photosensitive chemical 11-cis-retinal and isomerizes to 11-trans-retinal on absorption of light.
Outline how the formation of 11-trans-retinal results in the generation of nerve signals to the brain.
Markscheme
11-trans retinal no longer fits into the rhodopsin/protein
OR
11-trans retinal is ejected from the rhodopsin/protein
leads to conformational change in rhodopsin/protein «to opsin generating signals»
[2 marks]
Examiners report
[N/A]
Syllabus sections
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