Refer to the Graph Below, Which Shows the Amount of Carbon

question 181

Multiple Choice

Refer to the graph below, which shows the amount of carbon present as starch, sucrose, and hexose sugars at various times over a 24-hour period in the chloroplasts of leaf cells from a living green plant.Dawn marks the zero time point, and dusk marks the 14-hour time point. These data provide evidence in support of which statement about chloroplasts?

• A) The plant uses the carbohydrates produced in chloroplasts to make amino acids, lipids, and the building blocks of nucleic acids.
• B) Chloroplasts are found in organisms called autotrophs that are able to carry out photosynthesis; chloroplasts are not found in organisms called heterotrophs that do not carry out photosynthesis.
• C) Sugars accumulate in the chloroplasts as the result of photosynthesis and are stored in polysaccharide form until needed during the night, when photosynthesis stops.
• D) Photophosphorylation occurs in the chloroplast, where electron transport is coupled to proton transport across a membrane.
• E) The thylakoid membranes of a chloroplast contain light-harvesting complexes and electron transport proteins, while the stroma contains Calvin cycle enzymes.

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