DP Biology (last assessment 2024)
Question 18M.2.HL.TZ1.b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.HL.TZ1.b |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Compare and contrast | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.2.HL.TZ1.b
Compare and contrast the location of ATP synthase and the movement of protons during aerobic cell respiration and photosynthesis.
[2]
Markscheme
location of ATP synthase
a. cristae/inner mitochondrial membrane versus thylakoid membranes
movement of protons
b. protons moved/pumped as a result of electron flow/electron transport in both
c. (pumped by the electron transport chain) from the matrix to the intermembrane space versus from the stroma to the thylakoid space
d. through ATP synthase/synthetase in both (respiration and photosynthesis)
e. protons move (through ATP synthase/synthetase) down the concentration gradient in both
f. move (down concentration gradient) from the intermembrane space to the matrix versus from the thylakoid space to the stroma
