10 questions🇬🇧English
☀️ Photosynthesis Reactions – A-level
Biology · A-level — light-dependent reactions, the Calvin cycle, rubisco and limiting factors of photosynthesis
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Questions
In which part of the chloroplast does the Calvin cycle (light-independent reaction) take place?
Thylakoid lumen
Thylakoid membrane
Stroma
Outer envelope membrane
20s
Which enzyme catalyses the reaction between carbon dioxide and ribulose bisphosphate (RuBP)?
Phosphofructokinase
NADP reductase
Rubisco
ATP synthase
20s
What are the products of the photolysis of water in the light-dependent reaction?
Hydrogen gas and oxygen gas
ATP, electrons and oxygen
Protons, electrons and oxygen
Protons, electrons and carbon dioxide
20s
During photoionisation, what happens to a chlorophyll molecule?
It gains phosphate and becomes activated
It loses protons and becomes negative
It gains electrons and becomes reduced
It loses electrons and becomes oxidised
30s
During chemiosmosis in the chloroplast, which way do protons move through ATP synthase?
From the stroma into the cytoplasm
From the cytoplasm into the stroma
From the thylakoid lumen into the stroma
From the stroma into the thylakoid lumen
30s
In the Calvin cycle, what is reduced NADP used for?
Regenerating RuBP from triose phosphate
Combining CO₂ with RuBP
Pumping protons into the thylakoid
Converting GP into triose phosphate
30s
When one CO₂ molecule combines with one RuBP, the unstable 6-carbon product splits into:
Two molecules of TP
Three molecules of RuBP
Two molecules of GP
One molecule of hexose
30s
A plant photosynthesising steadily is suddenly put in the dark. What happens at first to GP and RuBP levels?
GP and RuBP both rise
GP rises and RuBP falls
GP falls and RuBP rises
GP and RuBP both fall
30s
Rate rises with light intensity, then levels off. Raising CO₂ makes the plateau higher. What limited the rate at the first plateau?
Water availability
Oxygen concentration
Light intensity
Carbon dioxide concentration
30s
Fixing 6 CO₂ molecules produces 12 TP molecules. How many of these TP molecules are used to regenerate RuBP?
12
2
6
10
60s