Chapter Questions
The raw materials for photosynthesis area. oxygen and water.b. oxygen and carbon dioxide.c. carbon dioxide and water.d. carbohydrates and water.e. carbohydrates and carbon dioxide.
During photosynthesis, carbon dioxide is _________ and water is ________ a. reduced, oxidizedb. oxidized, reducedc. reduced, reducedd. oxidized, oxidized
When electrons in the reaction center of PS II are passed to an energy- acceptor molecule, they are replaced by electrons that have been given up by a. oxygen.b. glucose.c. carbon dioxide.d. water.
During the light reactions of photosynthesis, ATP is produced when hydrogen ions movea. down a concentration gradient from the thylakoid space to the stroma.b. against a concentration gradient from the thylakoid space to the stroma.c. down a concentration gradient from the stroma to the thylakoid space.d. against a concentration gradient from the stroma to the thylakoid space.
Oxygen is generated by thea. light reactions.b. Calvin cycle.c. light reactions and the Calvin cycle reactions.d. closing of stomata.
The enzyme that produces ATP from ADP $+(\mathrm{P})$ in the thylakoid is a. RuBP carboxylaseb. G3P.c. ATPase.d. ATP synthase.e. coenzyme A.
Energy for the Calvin cycle is supplied by ________ from the light reactions.a. carbon dioxide and waterb. ATP and NADPHc. carbon dioxide and ATPd. ATP and watere. electrons and hydrogen ions
Carbon dioxide fixation occurs when $\mathrm{CO}_{2}$ combines witha. ATP.b. NADPH.c. $G 3 P$d. RuBP.
The output of the Calvin cycle that is used to generate carbohydrates is a. NADPH.b. $\mathrm{CO}_{2}$c. G3d. RuBP
$\operatorname{In} \mathrm{C}_{4}$ plants, $\mathrm{CO}_{2}$ fixation occursa. by adding electrons and a hydrogen ion when splitting water in bundle sheath cells.b. by joining $\mathrm{CO}_{2}$ to a $\mathrm{C}_{3}$ molecule and pumping it into bundle sheath cells.c. by splitting water only in bundle sheath cells.d. by oxidizing a $C_{4}$ molecule with $O_{2}$ derived from bundle sheath cells.
A leaf of a $\mathrm{C}_{4}$ plant differs from that of a $\mathrm{C}_{3}$ plant becausea. stomata cannot close.b. the mesophyll has no leaf spaces.c. bundle sheath cells are protected from leaf spaces by a ring of mesophyll cells.d. $C_{4}$ plant leaves are narrower to allow more $O_{2}$ to diffuse away.