1. In both oxygenic photosynthesis and anoxygenic photosynthesis, a. CO2 is the
ID: 218595 • Letter: 1
Question
1. In both oxygenic photosynthesis and anoxygenic photosynthesis, a. CO2 is the source of carbon for the synthesis of carbohydrates. b. 02 is a product. c. H2S is converted to sulfur and water. d. H20 is the electron donor for photophosphorylation. e. 02 is derived from H20 2. In the autumn, the green leaves of sugar maples turn orange. Which of the following is a likely explanation? a. The leaves dramatically increase their production of carotenoids to adjust to the autumn light. b. The autumn light lacks the blue and orange-red wavelengths found in the summer light. c. The autumn light has more orange wavelengths than the summer light has. d. The colors of carotenoids are no longer masked by the color of chlorophyll as the leaves cease to synthesize the chlorophyll pigments. e. The absorption spectrum of chlorophyll changes to include green wavelengths. 3. The Calvin cycle a. generates ATP and NADPH. b. is part of photorespiration. c. uses CO2 to synthesize the sugar phosphate G3P. d. adds 02 to RuBP. e. is not always dependent upon photosynthesis for energyExplanation / Answer
Answer:
1). A. CO2 is the source of carbon for the synthesis of carbohydrates
Explanation:
Oxygenic photosynthesis releases oxygen whereas anoxygenic photosynthesis does not release O2.
2). D. The colors of carotenoids are no longer masked by the color of chlorophyll as the leaves cease to synthesize the chlorophyll pigments
Explantion:
Senescing leaves of many temperate deciduous plants turn brilliant red in autumn. Unlike yellow and orange autumn leaves where chlorophyll breakdown unmasks the already present carotenoid pigments, most red leaves result from de novo synthesis of anthocyanin.
3). C. Used CO2 to synthesized the sugar phosphate G3P
Explanation:
Calvin cycle uses ATP & NADPH, which come from light reaction. It releases O2, uses RUBP and again regenerates RUBP.
It always dependent upon photosynthesis for energy and is not a part of photorespiration.
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