Question 18M.3.HL.TZ1.19
| Date | May 2018 | Marks available | [Maximum mark: 10] | Reference code | 18M.3.HL.TZ1.19 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Describe, Distinguish, Explain, State, Suggest | Question number | 19 | Adapted from | N/A |
The image shows an example of a label showing nutritional information.
State the importance of including vitamins in our diet.
[1]
are essential for health / cannot be synthesized by humans
Vitamin D is altered from a precursor.
Suggest one limitation of the information about vitamins shown on this label.
[1]
does not mention whether the information is based on adults/children/age
OR
only two vitamins are shown/no quantities given for vitamins
OR
it does not take into consideration sex / pregnancy / activity levels
Accept other valid correct limitation.
Distinguish between gastric juice and pancreatic juice using the table.
[3]
Each row must be a distinction
Describe the mode of action of steroid hormones.
[3]
a. steroid hormones enter cell / steroid hormones can pass through cell membranes
b. steroid hormones bind to receptor in the cytoplasm
c. the receptor-hormone complex interacts directly with genes/regulates gene expression
d. example (e.g. oestrogen, testosterone, progesterone)
Many animals, including humans, maintain strongly acidic conditions in part of their digestive systems. Explain two benefits of this to the animal.
[2]
a. provides ideal pH for stomach enzyme activity
b. (acidic conditions) denature proteins /start breakdown of other organic substances
c. (acidic conditions) convert pepsinogen (inactive) into pepsin
d. (acidic conditions) destroy pathogens in ingested food