Chapter 10-Photosynthesis

A spectrophotometer can be used to measure... A) the absorption spectrum of a substance B) the action spectrum of a substance C) the amount of energy in a photon D) the wavelength of visible light E) the efficiency of photosynthesis

A

CAM plants avoid photorespiration by... A) fixing CO2 into organic acids during the night; these acids then release CO2 during the day B) performing the Calvin cycle at night C) fixing CO2 into four-carbon compounds in the mesophyll, which release CO2 in the bundle-sheath cells D) using PEP carboxylate to fix CO2 to ribulose bis-phosphate (RuBP) E) keeping their stomata closed during the day

A

Chloroplasts can make carbohydrates in the dark if provided with... A) ATP and NADPH and CO2 B) an artificially induced proton gradient C) organic acids or four-carbon compounds D) a source of hydrogen E) photons and CO2

A

Oxidative phosphorylation A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

A

Photosynthesis is a redox process in which... A) CO2 is reduced and water is oxidized B) NADP+ is reduced and RuBP is oxidized C) CO2, NADP+, and water are reduced D) O2 acts as an oxidizing agent and water acts as a reducing agent E) G3P is reduced and the electron transport chain is oxidized

A

Reduction of NAD+ A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

A

Reduction of oxygen A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

A

Accessory pigments within chloroplasts are responsible for.. A) driving the splitting of water molecules B) absorbing photons of different wavelengths of light and passing that energy to P680 or P700 C) providing electrons to the reaction-center chlorophyll after photoexcited electrons pass to NADP+ D) pumping H+ across the thylakoid membrane to create a proton-motive force E) anchoring chlorophyll a within the reaction center

B

Blue light has more energy than red light. Therefore, blue light... A) has longer wavelength than red light B) has a shorter wavelength than red light C) contains more photons than red light D) has a broader electromagnetic spectrum than red light E) is absorbed faster by chlorophyll a

B

In the chemiosmotic synthesis of ATP in chloroplast, H+ diffuses through the ATP synthase... A) from the stroma into the thylakoid space B) from the thylakoid space into the stroma C) from the inter-membrane space into the matrix D) from the cytoplasm into the inter-membrane space E) from the matrix into the stroma

B

Reduction of CO2 A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

B

Six molecules of G3P formed in the Calvin cycle are used to produce... A) three molecules of glucose B) three molecules of RuBP and one G3P C) one molecule of glucose and four molecules of 3-phosphoglycerate D) one G3P and three four-carbon intermediates E) none of the above, since three molecules of G3P result from three turns of the Calvin cycle

B

A difference between electron transport in photosynthesis and respiration is that in photosynthesis... A) NADPH rather than NADH passes electrons to the electron transport chain B) ATP synthase releases ATP into the stroma rather than into the cytosol C) light provides the energy to push electrons to the top of the chain, rather than energy from the oxidation of food molecules D) an H+ concentration gradient rather than a proton-motive force drives the phosphorylation of ATP E) both A and C are correct

C

Chemiosmotic synthesis of ATP A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

C

The chlorophyll known as P680 has its electron "holes" filled by electrons from... A) photosystem I B) photosystem II C) water D) NADPH E) accessory pigments

C

How does cyclic electron flow differ from non-cyclic electron flow? A) No NADPH is produced by cyclic electron flow B) No O2 is produced by cyclic electron flow C) the cytochrome complex in the electron transport chain is not involved in cyclic electron flow D) both A and B are correct E) A,B, and C are correct

D

How many "turns" of the Calvin cycle are required to produce one molecule of glucose? A) 1 B) 2 C) 3 D) 6 E) 12

D

In C4 plants, the Calvin cycle... A) takes place at night B) only occurs when the stomata are closed C) takes place in the mesophyll cells D) takes place in the bundle-sheath cells E) uses PEP carboxylase instead of rubisco because of its greater affinity for CO2

D

In green plants, most of the ATP for synthesis of proteins, cytoplasmic streaming, and other cellular activities comes directly from... A) photosystem I B) photosystem II C) the Calvin cycle D) oxidative phosphorylation E) photophosphorylation

D

NADPH and ATP from the light reactions are both needed... A) in the carbon fixation state to provide energy and reducing power to rubisco B) to regenerate three RuBP from five G3P C) to combine two molecules of G3P to produce glucose D) to reduce 3-phosphoglycerate to G3P E) to reduce the H+ concentration in the stroma and contribute to the proton-motive force

D

Oxidation of NADP+ A) respiration B) photosynthesis C) both respiration and photosynthesis D) neither respiration and photosynthesis

D

What does rubisco do? A) reduces CO2 to G3P B) regenerates RuBP with the aid of ATP C) combines electrons and H+ to reduce NADP+ to NADPH D) adds CO2 to RuBP in the carbon fixation stage E) transfers electrons from NADPH to 1,3-biphosphoglycerate to produce G3P

D

Which of the following is mismatched with its location? A) light reactions -- grana B) electron transport chain -- thylakoid membrane C) Calvin Cycle -- stroma D) ATP synthase -- double membrane surrounding chloroplast E) splitting of water -- thylakoid space

D

Electrons that flow through the two photosystems have their highest potential energy in... A) water B) P680 C) NADPH D) the electron transport chain E) photoexcited P700

E

Noncyclic electron flow along with chemiosmosis in the chloroplast results in the production of... A) ATP only B) ATP and NADPH C) ATP and G3P D) ATP and O2 E) ATP, NADPH, and O2

E

What are the final electron acceptors for the electron transport chains in the light reactions of photosynthesis and in cellular respiration? A) O2 in both B) CO2 in both C) H2O in the light reaction and O2 in respiration D) P700 and NADP+ in the light reactions and NAD+ of FAD in respiration E) NADP+ in the light reaction and O2 in respiration

E

What portion of an illuminated plant cell would you expect to have the lowest pH level? A) nucleus B) cytosol C) chloroplast D) stroma of chloroplast E) thylakoid space

E