| Date | November 2018 | Marks available | 1 | Reference code | 18N.3.sl.TZ0.5 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | 5 | Adapted from | N/A |
Question
Dietary recommendations are made by scientists.
The formation of proteins from amino acids is an example of an anabolic reaction in the human body.
State the source of energy for such a synthetic reaction.
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.
Explain how a xenobiotic is biomagnified.
Markscheme
catabolism «of food/nutrients»
OR
«cellular» respiration ✔
Accept “ATP” but not “burning of food/nutrients”.
not enough sunlight/UV light «for synthesis of vitamin D in the skin» ✔
cannot be metabolized/broken down
OR
not biodegradable
OR
accumulates in lipid/fat tissues ✔
increased concentration as one species feeds on another «in the food chain» ✔
Examiners report
Syllabus sections
-
18M.3.sl.TZ1.6c.i:
State the name of the process used to break down the insulin protein into its constituent amino acids.
- 16N.3.sl.TZ0.9a: State the raw materials and source of energy used in the process described above.
-
17M.3.sl.TZ2.9b:
Identify the type of reaction which occurs.
-
17N.3.sl.TZ0.9a:
Describe what is meant by a condensation reaction.
-
18M.3.sl.TZ2.6a:
Identify the type of chemical reaction that occurs between fatty acids and glycerol to form lipids and the by-product of the reaction.
-
17M.3.sl.TZ1.13a:
Identify the type of metabolic process that occurs in the hydrolysis of the peptide during digestion.
-
19M.3.sl.TZ2.7a(ii):
Identify the type of reaction in (a).
-
19M.3.hl.TZ2.11a(ii):
Identify the type of reaction in (a).
-
19M.3.hl.TZ1.8b:
Formulate the equation for the complete hydrolysis of a starch molecule, (C6H10O5)n.
-
17M.3.sl.TZ1.12c.ii:
Biodegradable boxes made from polylactic acid, PLA, disintegrate when exposed to water.
State the formula of the product formed when water reacts with PLA.
-
19M.3.sl.TZ1.7b:
Formulate the equation for the complete hydrolysis of a starch molecule, (C6H10O5)n.
