The end products of the light dependentreactions of photosynthesis are

a. ADP, H2O, NADPHb. ADP, PGAL, RuBP (RuDP)c. ATP, CO2, H2Od. ATP, NADPH, O2

e. CO2, H+, PGAL

Answer: d

The function of water in photosynthesisis to

a. combine with CO2

b. absorb light energyc. supply electrons in the light-dependent reactionsd. Transport H+ ions in the light-independent (dark) reactionse. Provide O2 for the light-independent reactions

Answer: c

When hydrogen ions are pumped out of thechloroplast stroma, across the thylakoidmembrane, and into the thylakoid space, theresult is

a. damage to the chloroplast.b. the reduction of NADc. the restoration of the Na-K balance across the membrane.d. the creation of a proton gradient.e. the lowering of pH in the chloroplast stroma.

Answer: d

Which of the following processes is carried out more efficiently by a C4 plant than bya C3 plant?

a. Light absorptionb. Chemiosmotic couplingc. Photolysisd. Fixation of CO2

e. Transport of sugars

Answer: d

Needed: Light Photons(discrete packets of energy)

High energy photons (UV and above)cause cellular damage by denaturingorganic molecules

En

erg

y

Only ~ 42% of solar radiation Makes it to the surface

Needed: Chlorophyll

(blue green in color)

(yellow green in color)

Also present: Carotenoids

(chlorophyll In membranes)

Thylakoid space

Stroma

Mitochondria Chloroplast

Electron source Chemical energy from food molecules

Light energy from photons

Site of hydrogen reservoir

Intermembrane space

Thylakoid lumen

Site of ATP synthesis

Mitochondrial matrix

Chloroplast stroma

Comparison of chemiosmosis inmitochondria and

chloroplasts

Campbell; Fig. 10.15

Comparison of chemiosmosis inmitochondria and

chloroplasts

(PGA)

(PGAP)

(PGAL)

(PGAL)

The function of water in photosynthesisis to

a. combine with CO2

b. absorb light energyc. supply electrons in the light-dependent reactionsd. Transport H+ ions in the light-independent (dark) reactionse. Provide O2 for the light-independent reactions

Answer: c

The end products of the light dependentreactions of photosynthesis are

a. ADP, H2O, NADPHb. ADP, PGAL, RuBP (RuDP)c. ATP, CO2, H2Od. ATP, NADPH, O2

e. CO2, H+, PGAL

Answer: d

Which of the following processes is carried out more efficiently by a C4 plant than bya C3 plant?

a. Light absorptionb. Chemiosmotic couplingc. Photolysisd. Fixation of CO2

e. Transport of sugars

Answer: d

When hydrogen ions are pumped out of thechloroplast stroma, across the thylakoidmembrane, and into the thylakoid space, theresult is

a. damage to the chloroplast.b. the reduction of NADc. the restoration of the Na-K balance across the membrane.d. the creation of a proton gradient.e. the lowering of pH in the chloroplast stroma.

Answer: d