| Date | November 2017 | Marks available | 1 | Reference code | 17N.3.sl.TZ0.10 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | 10 | Adapted from | N/A |
Question
Vitamins can be water-soluble or fat-soluble.
Explain, at the molecular level, why vitamin D is soluble in fats. Use section 35 of the data booklet.
State one function of vitamin D in the body.
Markscheme
«mainly» hydrocarbon/non-polar «structure»
forms London/dispersion/instantaneous induced dipole-induced dipole forces «with fats»
Accept “forms van der Waals’/vdW forces”.
Award [1 max] for “contains only one OH/hydroxyl AND cannot form «enough» H-bonds”.
helps absorb calcium
OR
helps build bones
OR
helps keep bones healthy
OR
helps block the release of parathyroid hormone
OR
helps in muscle function
OR
helps immune system function
OR
cell growth
OR
reduction of inflammation
OR
protection from osteoporosis
OR
prevents rickets
Accept helps prevent colon/breast/prostate cancer.
Accept treat/prevent diabetes/heart disease/high blood pressure/multiple sclerosis.
Accept other correct answers.
Examiners report
Syllabus sections
- 20N.3.sl.TZ0.7a: The diverse functions of biological molecules depend on their structure and shape. Classify...
- 19N.3.hl.TZ0.14c: Vitamins are organic compounds essential in small amounts. State the name of one functional...
- 19N.3.sl.TZ0.10a: State the name of one functional group common to all three vitamins shown in section 35 of...
-
19M.3.hl.TZ1.13:
Ascorbic acid and retinol are two important vitamins.
Explain why ascorbic acid is soluble in water and retinol is not. Use section 35 of the data booklet.
-
18N.3.sl.TZ0.5b:
Suggest why it is advisable for those living in northerly or southerly latitudes (that is away from the equator) to take vitamin D supplements during the winter.
-
19M.3.hl.TZ2.11c:
Lecithin aids the body’s absorption of vitamin E.
Suggest why vitamin E is fat-soluble.
-
19M.3.sl.TZ2.7d:
Lecithin aids the body’s absorption of vitamin E.
Suggest why vitamin E is fat-soluble.
-
17M.3.sl.TZ1.13d:
The solubility of a vitamin depends on its structure.
Identify the vitamin given in section 35 of the data booklet that is the most soluble in water.
-
19M.3.sl.TZ1.10:
Ascorbic acid and retinol are two important vitamins.
Explain why ascorbic acid is soluble in water and retinol is not. Use section 35 of the data booklet.
-
18M.3.sl.TZ1.7c.ii:
Predict the solubility of retinol (vitamin A) in body fat, giving a reason. Use section 35 of the data booklet.
-
18M.3.sl.TZ2.9:
Explain the solubility of vitamins A and C using section 35 of the data booklet.
-
17M.3.sl.TZ2.11:
Suggest, in terms of its structure, why vitamin D is fat-soluble using section 35 of the data booklet.
-
17N.3.sl.TZ0.10a:
Explain, at the molecular level, why vitamin D is soluble in fats. Use section 35 of the data booklet.
- 20N.3.hl.TZ0.8a: The diverse functions of biological molecules depend on their structure and shape. Classify...
