Question 21M.2.HL.TZ2.c
| Date | May 2021 | Marks available | [Maximum mark: 4] | Reference code | 21M.2.HL.TZ2.c |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Identify | Question number | c | Adapted from | N/A |
The enzyme Rubisco is used in carbon fixation during photosynthesis. Identify four other examples of proteins that illustrate the wide range of functions of this group of biochemicals in living organisms.
[4]
a. insulin receptors start the cellular signalling pathway/other receptor
b. leptin is a hormone / other protein hormone ✔
c. immunoglobulins/antibodies defend body from disease ✔
d. rhodopsin/photosystems convert light energy to electrical impulses ✔
e. keratin/collagen/other example is a structural protein ✔
f. tubulin/microtubules part of cytoskeleton/ involved in cell division
g. ATP synthase is an enzyme that catalyzes the formation of ATP / other enzyme and function ✔
h. fibrin/fibrinogen is a protein involved in clotting ✔
i. hemoglobin/sodium potassium pump/other example is a transport protein ✔
j. actin/myosin/other example is involved in muscle contraction ✔
k. any other named example and function ✔
l. a second other named example and function ✔
m. spider silk is used to form spider webs/capture prey ✔
Accept only one example of each protein type for example only one enzyme or only one hormone etc.
Mp k can be awarded only once.
Mp I can be awarded only once.
Question 6 was a popular question.
Well answered by most except for when students gave multiple examples of proteins of the same functional type; for example, four examples of enzymes when the question asked for an illustration of the wide range of functions of proteins.
