Exam 10: Photosynthesis

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light. -If you ran the same experiment without passing light through a prism, what would you predict?

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Where are the molecules of the electron transport chain found in plant cells?

Suppose the interior of the thylakoids of isolated chloroplasts were made acidic and then transferred in the dark to a pH 8 solution. What would be likely to happen?

The alternative pathways of photosynthesis using the C₄ or CAM systems are said to be compromises. Why?

Figure 10.3 -Which of the following statements is true concerning Figure 10.3?

If photosynthesizing green algae are provided with CO₂ synthesized with heavy oxygen (¹⁸O), later analysis will show that all but one of the following compounds produced by the algae contain the ¹⁸O label. That one is

Reactions that require CO₂ take place in

If plant gene alterations cause the plants to be deficient in photorespiration, what would most probably occur?

Cyclic electron flow may be photoprotective (protective to light-induced damage). Which of the following experiments could provide information on this phenomenon?

What is the primary function of the Calvin cycle?

Photosynthesis is not responsible for

Generation of proton gradients across membranes occurs during

In any ecosystem, terrestrial or aquatic, what group(s)is (are)always necessary?

Which of the following are directly associated with photosystem I?

In autotrophic bacteria, where are the enzymes located that can carry on carbon fixation (reduction of carbon dioxide to carbohydrate)?

Which process is most directly driven by light energy?

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecules of ATP consumed, but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from?

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

Some photosynthetic bacteria (e.g., purple sulfur bacteria)have only photosystem I, whereas others (e.g., cyanobacteria)have both photosystem I and photosystem II. Which of the following might this observation imply?