AP Photosynthesis

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

• CO2 and glucose
• H2O and O2
• electrons and H+
• ATP and NADPH

Where does the Calvin cycle take place?

• stroma of the chloroplast
• thylakoid membrane
• outer membrane of the chloroplast
• interior of the thylakoid membrane

Which of the following is directly associated with Photosystem I?

• harvesting light energy to make ATP
• receiving electrons from the thylakoid membrane ETC
• generation of molecular oxygen
• extraction of hydrogen electrons from the splitting of water

What is the primary function of cyclic electron flow?

• to produce additional NADPH
• to produce additional ATP
• to produce additional oxygen
• to produce additional carbon dioxide

In a plant cell, where are ATP synthase complexes located?

• thylakoid membranes only
• inner mitochondrial membranes only
• thylakoid membrane and inner mitochondrial membranes
• thylakoid membrane and plasma membranes

Which of the following statements about the relationship between photosynthesis and cellular respiration is true?

• In cellular respiration the biochemical pathways of photosynthesis run in reverse.
• In photosynthesis the biochemical pathways of cellular respiration run in reverse.
• Cellular respiration occurs only in animals and photosynthesis occurs only in plants.
• Cellular respiration is catabolic and photosynthesis is anabolic.

Where are the molecules of the electron transport chain associated with photophosphorylation located in plant cells?

• thylakoid membanes of chloroplasts
• stroma of chloroplasts
• matrix of mitochondria
• outer membrane of chloroplasts

In C3 photosynthesis, the reactions that require ATP take place in

• the light reactions alone
• the calvin cycle only
• both the light reactions and the calvin cycle
• the citric acid cycle

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

• The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, ℗i, and NADP+ to the light reactions.
• The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the Calvin cycle provides water and electrons to the light reactions.
• The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.
• The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP.

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

• fix CO2 into organic acids during the night when temperatures are cooler.
• fix CO2 into by combining it with RuBP in the Calvin cycle.
• obtain CO2 through their roots during the day.
• fix CO2 into organic acids in the mesophyll cells, which do not rely on stomata.