The main purpose of photosynthesis is to make sugar from CO_2 gas (carbon fixati
ID: 59738 • Letter: T
Question
The main purpose of photosynthesis is to make sugar from CO_2 gas (carbon fixation) but for this to happen, the light reactions must occur first because: Light energy is used to directly link CO_2 molecules together to make sugars Light is harvested to make chemical energy currency (ATP and NADPH) which are then used to fix CO_2 into sugar Light allows water and CO_2 to directly combine to make sugar The reactants of photosynthesis are involved in physically separated reactions. Where in the chloroplast does carbon fixation take place? In the lumen of the thylakoid system In the thylakoid membrane In the mitochondrial matrix In the chloroplast stroma, outside the thylakoids The enzyme Rubisco has the job of incorporating unreactive C02 into something which is useful and much more reactive (sugar). How does Rubisco achieve this energetically unfavorable reaction? It does the job with other enzymes by binding one C02 at a time to previously formed 5-carbon sugar molecules using energy from the light reactions.Explanation / Answer
Q 10. b. Light is harvested to make chemical energy currency (ATP and NADPH) which are then used to fix CO2 into sugar.
Q 11. d. In the chloroplast stroma, outside the thylakoids.
Chloroplasts (organelle found in plants and algae) are bounded by a double membrane, which have an outer and inner membrane. The inner space is called “stroma,” which contains concentrated enzymes and disc-like sacs called “thylakoids.” The lump of thylakoids is called “granum.” Thylakoid membrane contains the pigments (such as chlorophyll) which capture the solar energy and stroma contains the enzymes which are essential for photosynthesis.
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