Exam 11: Photosynthetic Processes

Paper chromatography is a technique used to separate molecules based upon their polarity. If pigments from oak leaves are extracted and subjected to paper chromatography, which of the following statements best describes the pigment bands that would be observed?

The accompanying figure shows the absorbance spectrum for a photosynthetic bacterium that appears purple. Which of the following wavelengths of light are maximally absorbed by this organism?

Which of the following statements best describes the relationship between photosynthesis and cellular respiration?

If photosynthesizing green algae are provided with CO₂ containing heavy oxygen (18O), which of the following molecules produced by the algae (refer to the accompanying figure) would be least likely to contain 18O in subsequent analyses?

Which of the following statements describes a primary benefit of having photosystem reaction centers composed of several structurally different pigments?

P680+ is said to be the strongest biological oxidizing agent. The strong oxidizing potential of P680+ is essential for its function because it ________.

When a filament of algae is illuminated with light that is passed through a prism, different segments of algae are exposed to different wavelengths of light. When aerobic bacteria are present, they congregate in highest concentrations in the areas illuminated by the red and blue light. These data suggest a relationship between which of the following variables?

Which of the following events is most immediately associated with the absorption of energy by chlorophyll molecules of the reaction-center complex?

Which of the following occurs during the Calvin cycle?

If various plant cell membranes are isolated and incubated with a proton gradient across the isolated membrane in the presence of ADP and i, which of the following samples are most likely to be able to synthesize ATP?

The light reactions supply the Calvin cycle with ________.

Which of the following statements best explains why photosynthesis using C4 or CAM systems may be described as a metabolic compromise?

Which of the following processes would be most directly affected if a thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma?

Most sugar is transported from the leaves to the rest of the plant in the form of which of the following molecules?

On a spaceship designed to support a multiyear voyage to the outer planets of the solar system, plants will be grown to provide oxygen and to recycle carbon dioxide. Because the spaceship will be so far from the sun, an artificial light source will be needed to support photosynthesis. Which of the following wavelengths of light should be used to maximize plant growth?

In autumn, chlorophyll is degraded in the leaves of deciduous trees. Which of the following statements best explains the change in color from green to shades of yellow, orange, or red?

A mutation that eliminates a plant's ability to perform photorespiration will most likely have which of the following effects on the plant?

Which of the following statements best describes a characteristic of C4 plants?

In mechanism, photophosphorylation is most similar to ________.

When a filament of algae is illuminated with light that is passed through a prism, different segments of algae are exposed to different wavelengths of light. When aerobic bacteria are present, they congregate in highest concentrations in the areas illuminated by the red and blue light. Which of the following statements provides the best explanation for the bacteria congregation in these areas?