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Light Reactions of Photosynthesis

Question #1:
Which of the following is NOT true about the light reactions of photosynthesis?
a.) there are two photosystems linked by an electron transport chain
b.) electron transport is coupled to production of ADP
c.) the production of NADPH is carried out by Photosystem I, whereas the splitting of water is
carried out by Photosystem II
d.) O2 production is coupled to these reactions
e.) none of the above

Question #2:
In photosynthesis,
a.) The dark reactions take place in the outer mitochondrial membrane, whereas the light
reactions occur in the inner mitochondrial membrane
b.) The light reactions take place in the inner mitochondrial membrane, whereas the dark
reactions occur in the matrix
c.) The light reactions take place in the thylakoid membrane, whereas the dark reactions occur
in the stroma
d.) A pH gradient is established between the thylakoid space (low pH) and the stroma (high
pH).
e.) Both C and D

Question #3:
What is the role of the Fe-S cluster in Photosystem II?
a.) It accepts electrons from the preceding PSII component
b.) It accepts protons from the preceding PSII component
c.) It is responsible for establishing a pH gradient between the matrix and inner mitochondrial
space
d.) both a and b
e.) both a and c

Question #4:
After the CO2 fixation step in photosynthesis, the production of glucose takes place:
a.) via a process nearly identical to gluconeogenesis
b.) via glycolysis
c.) via the TCA cycle
d.) via the pentose phosphate pathway
e.) via glycogen biosynthesis

Question #5:
For the synthesis of the six-carbon sugars from CO2 in photosynthesis, the required ATP and NADPH
come from the dark reactions of photosynthesis.
a.) True
b.) False

Solution Preview

1b -- electron transport is not linked to the production of ADP, but to the production of ATP

2e

3a -- "c" cannot be correct since the photosystems have ...

Solution Summary

5 multiple choice questions are answered with some brief explanation.

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