AP Bio Chapter 10 Test Your Knowledge

Chloroplasts can make carbohydrate in the dark if provided with a) ATP, NADPH, and O2 b) an artificially induced proton gradient c) organic acids or four-carbon compounds d) a source of hydrogen e) photons and CO2

a) ATP, NADPH, and O2

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) CO2 is reduced and water is oxidized

CAM plants avoid photosynthesis 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 bisphosphate (RuBP) e) keeping their stomata closed during the day

a) fixing CO2 into organic acids during the night; these acids then release CO2 during the day

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Oxidative phosphorylation

a) respiration

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Reduction of NAD+

a) respiration

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Reduction of oxygen

a) respiration

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) the absorption spectrum of a substance

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 and 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) absorbing photons of different wavelengths of light and passing that energy to P680 and P700

In the chemiosmotic synthesis of ATP in a 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 intermembrane space into the matrix d) from the cytoplasm into the intermembrane space e) from the matrix into the stroma

b) from the thylakoid space into the stroma

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Reduction of CO2

b) photosynthesis

Six molecules of G3P formed from the fixation of 3CO2 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) three molecules of RuBP and one G3P

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Chemiosmotic synthesis of ATP

c) both respiration and photosynthesis

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 electron 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) light provides the energy to push electrons to the top of the electron chain, rather than energy from the oxidation of food molecules

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) water

How many "turns" of the Calvin cycle would it take to produce one molecule of glucose? a) 1 b) 2 c) 3 d) 6 e) 12

d) 6

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) ATP synthase - double membrane surrounding chloroplast

How does cyclic electron flow differ from linear electron flow? a) No NADPH is produced by cyclic electron flow b) No O2 is produced 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) Both a and b are correct

Which of the following statements is false? a) When isolated chlorophyll molecules absorb photons, their electrons fall back to ground state, giving off heat and light b) Accessory pigments, cyclic electron flow, and photorespiration may all contribute to photoprotection, protecting plants from the detrimental effects of intense light c) In the cyclic electron flow of purple sulfur bacteria, the electron transport chain would pump H+ across the plasma membrane from inside to outside the cell d) In both photosynthetic prokaryotes and eukaryotes, ATP synthases catalyze the production of ATP within the cytoplasm of the cell e) In sulfur bacteria, H2S provides the hydrogen (and thus electron) source for photosynthesis

d) In both photosynthetic prokaryotes and eukaryotes, ATP synthases catalyze the production of ATP within the cytoplasm of the cell

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-bisphosphoglycerate to G3P

d) adds CO2 to RuBP in the carbon fixation stage

Indicate if the following events occur during a) respiration b) photosynthesis c) both respiration and photosynthesis d) neither respiration nor photosynthesis Oxidation of NADP+

d) neither respiration nor photosynthesis

In green plants, most of the ATP for synthesis of proteins, cytoplasmic streaming, and other cellular activities come directly from a) photosystem I b) photosystem II c) the Calvin cycle d) oxidative phosphorylation e) photophosphorylation

d) oxidative phosphorylation

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) takes place in the bundle-sheath cells

NADPH and ATP form the light reactions are both needed a) in the carbon fixation stage to provide energy and reducing power to rubisco b) to regenerate three RuBP from five G3P (glyceraldehyde-3-phosphate) 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) to reduce 3-phosphoglycerate to G3P

Linear 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) ATP, NADPH, O2

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 reactions and O2 in respiration d) P700 and NAD+ in the light reactions and NAD+ or FAD in respiration e) NADP+ in the light reactions and O2 in respiration

e) NADP+ in the light reactions and O2 in respiration

What portion of an illuminated plant cell would you expect to have the lowest pH? a) nucleus b) cytosol c) chloroplast d) stroma of chloroplast e) thylakoid space

e) thylakoid space