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Photosynthesis Part 2 Concept Review

By John Lundy
Last updated over 6 years ago
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.
2.

What is the initial source of electrons for the chloroplast electron transport chain?

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.
3.

Which of the following statements is true?

4.

Which of the following components is not used by both
plants and cyanobacteria to carry out photosynthesis?

5.

What two main products result from photosynthesis?

6.

In which compartment of the plant cell do the lightindependent
reactions of photosynthesis take place?

7.

Which of the following structures is not a component of
a photosystem?

8.

Which complex is not involved in the establishment of
conditions for ATP synthesis?

9.

From which component of the light-dependent
reactions does NADPH form most directly?

10.

Which statement correctly describes carbon fixation?