Exam 8: Photosynthesis: Using Sunlight to Build Carbohydrates

After several weeks of no rain during the summer, you observe that leaves of some plants are wilted. Which of the following would you expect to observe at the cellular level with respect to photosynthesis?

Prokaryotes account for roughly half of terrestrial photosynthesis.

Which of the following could be TRUE if a plant cell is exposed to a toxin that makes the thylakoid membrane freely permeable to protons?

Cyclic electron transport enhances ATP production because:

During photosynthesis in plants and algae, _____ is oxidized and _____ is reduced.

Suppose you discovered a mutant strain of spinach in which the thylakoid membranes were slightly permeable to protons, thus allowing a slow leakage (remember that normal membranes are not permeable to protons at all). What change in the reactions of photosynthesis might occur in compensation for this defect?

Which of the following is the primary advantage to eukaryotic photosynthetic organisms of having two photosystems?

The reactions of the Calvin cycle used to be referred to as the "dark reactions" of photosynthesis, implying that light was not required for this pathway to incorporate CO₂ into carbohydrate. However, in the absence of light the Calvin cycle shuts down. Which of the following parts of the Calvin cycle would be impacted FIRST by the absence of light energy?

What is the INITIAL carbon input in the Calvin cycle?

The experiment in Fig. 8.3 demonstrates that the percentage of ¹⁸O₂ increases when the:

If plants are exposed to a toxin that makes the thylakoid membrane leaky to protons, predict the rate of ATP production by the plants.

In plants and algae, which of the following is a by-product of photosynthesis?

ATP production in photosynthesis requires:

How much of the sun's usable energy is captured by the photosynthetic electron transport chain?

The products of the Calvin cycle are 3-carbon sugars.

Which of the following statements is TRUE regarding the Calvin cycle?

Which of the following is part of the photosynthetic electron transport chain between photosystems I and II?

Chemicals called uncouplers can make membranes permeable to small molecules and ions. What effect might uncouplers have on photosynthesis?

During photosynthesis, _____ is reduced to _____.

How many molecules of NADPH are required for 12 molecules of RuBP to be carboxylated by rubisco?