The end products of the light dependent reactions of photosynthesis are a. ADP, H 2 O, NADPH b. ADP, PGAL, RuBP (RuDP) c. ATP, CO 2, H 2 O d. ATP, NADPH,

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Presentation transcript:

The end products of the light dependent reactions of photosynthesis are a. ADP, H 2 O, NADPH b. ADP, PGAL, RuBP (RuDP) c. ATP, CO 2, H 2 O d. ATP, NADPH, O 2 e. CO 2, H +, PGAL Answer: d

The function of water in photosynthesis is to a. combine with CO 2 b. absorb light energy c. supply electrons in the light-dependent reactions d. Transport H + ions in the light-independent (dark) reactions e. Provide O 2 for the light-independent reactions Answer: c

When hydrogen ions are pumped out of the chloroplast stroma, across the thylakoid membrane, and into the thylakoid space, the result is a. damage to the chloroplast. b. the reduction of NAD c. 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 C 4 plant than by a C 3 plant? a. Light absorption b. Chemiosmotic coupling c. Photolysis d. Fixation of CO 2 e. Transport of sugars Answer: d

Needed: Light Photons (discrete packets of energy) High energy photons (UV and above) cause cellular damage by denaturing organic molecules Energy 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

MitochondriaChloroplast Electron sourceChemical energy from food molecules Light energy from photons Site of hydrogen reservoir Intermembrane space Thylakoid lumen Site of ATP synthesis Mitochondrial matrixChloroplast stroma Comparison of chemiosmosis in mitochondria and chloroplasts

Campbell; Fig Comparison of chemiosmosis in mitochondria and chloroplasts

(PGA) (PGAP) (PGAL)

The function of water in photosynthesis is to a. combine with CO 2 b. absorb light energy c. supply electrons in the light-dependent reactions d. Transport H + ions in the light-independent (dark) reactions e. Provide O 2 for the light-independent reactions Answer: c

The end products of the light dependent reactions of photosynthesis are a. ADP, H 2 O, NADPH b. ADP, PGAL, RuBP (RuDP) c. ATP, CO 2, H 2 O d. ATP, NADPH, O 2 e. CO 2, H +, PGAL Answer: d

Which of the following processes is carried out more efficiently by a C 4 plant than by a C 3 plant? a. Light absorption b. Chemiosmotic coupling c. Photolysis d. Fixation of CO 2 e. Transport of sugars Answer: d

When hydrogen ions are pumped out of the chloroplast stroma, across the thylakoid membrane, and into the thylakoid space, the result is a. damage to the chloroplast. b. the reduction of NAD c. 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

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