Photosynthesis Part 2 Concept Review
by John Lundy
| 14 Questions
Note from the author:
A Review looking at photosynthesis and all related topics
Figure 8.16 In the photosystem II (PSII) reaction center, energy from sunlight is used to extract electrons from
water. The electrons travel through the chloroplast electron transport chain to photosystem I (PSI), which reduces
NADP+ to NADPH. The electron transport chain moves protons across the thylakoid membrane into the lumen. At
the same time, splitting of water adds protons to the lumen, and reduction of NADPH removes protons from the
stroma. The net result is a low pH in the thylakoid lumen, and a high pH in the stroma. ATP synthase uses this
electrochemical gradient to make ATP.
What is the initial source of electrons for the chloroplast electron transport chain?
a. water
b. oxygen
c. carbon dioxide
Figure 8.18 The Calvin cycle has three stages. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into
an organic molecule, 3-PGA. In stage 2, the organic molecule is reduced using electrons supplied by NADPH. In
stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue. Only one carbon
dioxide molecule is incorporated at a time, so the cycle must be completed three times to produce a single threecarbon
GA3P molecule, and six times to produce a six-carbon glucose molecule.
Which of the following statements is true?

a. In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. GA3P and water are
b. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. GA3P and oxygen are
c. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are
d. In photosynthesis, water and carbon dioxide are reactants. GA3P and oxygen are products.
Which of the following components is not used by both
plants and cyanobacteria to carry out photosynthesis?

a. chloroplasts
b. chlorophyll
c. carbon dioxide
d. water
What two main products result from photosynthesis?

a. oxygen and carbon dioxide
b. chlorophyll and oxygen
c. sugars/carbohydrates and oxygen
d. sugars/carbohydrates and carbon dioxide
In which compartment of the plant cell do the lightindependent
reactions of photosynthesis take place?

a. thylakoid
b. stroma
c. outer membrane
d. mesophyll
Which of the following structures is not a component of
a photosystem?

a. ATP synthase
b. antenna molecule
c. reaction center
d. primary electron acceptor
Which complex is not involved in the establishment of
conditions for ATP synthesis?

a. photosystem I
b. ATP synthase
c. photosystem II
d. cytochrome complex
From which component of the light-dependent
reactions does NADPH form most directly?

a. photosystem II
b. photosystem I
c. cytochrome complex
d. ATP synthase
Which statement correctly describes carbon fixation?

a. the conversion of CO2 into an organic
b. the use of RuBisCO to form 3-PGA
c. the production of carbohydrate molecules from
d. the formation of RuBP from G3P molecules
e. the use of ATP and NADPH to reduce CO2
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