DP Biology (last assessment 2024)
Question 18N.3.SL.TZ0.4c
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.SL.TZ0.4c |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
18N.3.SL.TZ0.4c
The energy used by the brain and skeletal muscle of a 70 kg man was measured over the period of one day.
(c)
Suggest one reason for the difference between the brain and skeletal muscle in metabolic rate.
[1]
Markscheme
a. «brain requires more» energy to maintain a proper ionic balance/homeostasis/active transport ✔
b. «brain requires more» energy for synapses/neurotransmitters ✔
c. «brain requires more» energy for thinking and memory ✔
d. skeletal muscle active on demand but brain constantly active ✔
