Exam 11: Photosynthetic Processes

To identify the molecule that first reacts with CO₂ in the light-independent reactions of photosynthesis, Calvin and Benson manipulated the carbon-fixation cycle by either elminating CO₂ or light from cultures of photosynthetic algae. Which of the following statements best predicts the immediate effects of these manipulations on the concentration of the molecule that initially reacts with CO₂?

In which of the following organisms did the process of photosynthesis most likely originate?

The oxygen released by photosynthesis is produced by which of the following processes?

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

Lab students placed ten spinach leaf disks in each of three test tubes containing a baking soda solution and a control tube without baking soda. The volume of liquid in each tube and the temperature of the solutions were held constant. All tubes were placed an equal distance from the light source indicated in the accompanying table. After 10 minutes, the amount of oxygen present in each sample was measured. Which tube is expected to produce the least amount of oxygen?

Which of the following statements best summarizes the metabolic results of photorespiration?

Which of the following statements best describes the relationship between the wavelength of light and the quantity of energy per photon?

Which of the following processes is driven by the free energy released as electrons move through photosystem II and I in the thylakoid membranes?

Which of the following statements best explains the ability of C4 plants to perform photosynthesis with no apparent photorespiration?

Which of the following molecules is the final electron acceptor for electrons from photosystem I?

ATP is synthesized in plant cells by chemiosmosis in which of the following processes?

Based on the accompanying figure, which of the following wavelengths of light is most effective in driving photosynthesis?

In a plant, which of the following reactions produces molecular oxygen (O₂)?

Which of the following processes is most directly driven by light energy?

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

Which of the following describes the function of the pigment molecules in a light-harvesting complex in the thylakoid membranes?

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

A plant with unique photosynthetic pigments has leaves that appear reddish yellow. Which of the following wavelengths of visible light are most effectively absorbed by this pigment?

A greenhouse becomes excessively hot from too much sunlight. One solution is to shade the plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength of light. Which of the following colors would reduce the overall light energy without reducing plant growth?

What are the products of linear electron flow in the light reactions of photosynthesis?