What is the function of stomata?
a. fermentation b. water absorption c. Calvin cycle d. gas exchange e. light-dependent reacation
D
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle? a. CO2 and glucose b. H2O and O2 c. ADP, i, and NADP+ d. electrons and H+ e. ATP and NADPH
E
Which of the following equations best summarizes photosynthesis? a. 6 CO2 + 6 H2O + 6 O2 → C6H12O6 b. 6 CO2 + 6 H2O → C6H12O6 + 6 O2 c. 6 CO2 + 6 O2 → C6H12O6 + 6 H2O d. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
B
Photosynthesis is not responsible for a. oxygen in the atmosphere. b. the ozone layer. c. atmospheric CO2. d. most of the organic carbon on Earth's surface. e. fossil fuels.
E
The last stage of one complete turn of the Calvin cycle involves ______. a. G3P production b. reduction of CO2 c. oxidation of CO2 d. regeneration of RuBP e. carbon fixation
D
Which statement describes the functioning of photosystem II? a. Light energy excites electrons in the thylakoid membrane electron transport chain. b. Photons are passed along to a reaction-center chlorophyll. c. The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH. d. The electron vacancies in P680+ are filled by electrons derived from water. e. The splitting of water yields molecular carbon dioxide as a by-product
D
Which of the following statements best describes the relationship between photosynthesis and respiration? a. Respiration runs the biochemical pathways of photosynthesis in reverse. b. Photosynthesis stores energy in complex organic molecules, whereas respiration releases it. c. Photosynthesis occurs only in plants and respiration occurs only in animals. d. ATP molecules are produced in photosynthesis and used up in respiration. e. Respiration is anabolic and photosynthesis is catabolic.
B
How many molecules of glucose are produced by each cycle of the light reaction? a. zero b. two c. four d. three e. six
A
Where do the enzymatic reactions of the Calvin cycle take place? a. stroma of the chloroplast b. thylakoid membranes c. matrix of the mitochondria d. cytosol around the chloroplast e. thylakoid space
A
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they a. fix CO2 into organic acids during the night. b. fix CO2 into sugars in the bundle-sheath cells. c. fix CO2 into pyruvate in the mesophyll cells. d. use photosystem I and photosystem II at night e. use the enzyme phosphofructokinase, which outcompetes rubisco for CO2.
A