Why was no carbon dioxide produced by either fraction incubated with glucose? Why did the cytoplasm fraction produce lactic acid in the presence of both glucose and pyruvate? Why did the mitochondria produce carbon dioxide in the presence of pyruvate but not in the presence of glucose? The figures to the right display the absorption range for several different pigments found in plants (top) and the rate of photosynthesis at varying conditions of wavelength in one plant species (bottom): What color and wavelength of light is reflected by the plant species tested? How do you know? What wavelength(s) increase the rate of photosynthesis in the plant species tested? What pigment does this correspond to? How do you know? Energy and Metabolism Short Free Response (4 points) In a second experiment, Variety A seedlings at 17oC were treated with a chemical that prevents NADH from being oxidized to NAD+. Predict the most likely effect of the chemical on metabolism and oxygen consumption of the treated seedlings. Explain your prediction.
Why was no carbon dioxide produced by either fraction incubated with glucose? Why did the cytoplasm fraction produce lactic acid in the presence of both glucose and pyruvate? Why did the mitochondria produce carbon dioxide in the presence of pyruvate but not in the presence of glucose? The figures to the right display the absorption range for several different pigments found in plants (top) and the rate of photosynthesis at varying conditions of wavelength in one plant species (bottom): What color and wavelength of light is reflected by the plant species tested? How do you know? What wavelength(s) increase the rate of photosynthesis in the plant species tested? What pigment does this correspond to? How do you know? Energy and Metabolism Short Free Response (4 points) In a second experiment, Variety A seedlings at 17oC were treated with a chemical that prevents NADH from being oxidized to NAD+. Predict the most likely effect of the chemical on metabolism and oxygen consumption of the treated seedlings. Explain your prediction.
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