QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
"Through photosynthesis, a simple sugar is produced. Where do the carbon atoms come from to produce this sugar molecule?
A. Carbonyl groups
B. Phosphate groups
C. NADPH
D. Carbon dioxide"
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand Photosynthesis
Photosynthesis is a complex process where plants convert light energy into chemical energy to produce glucose (a simple sugar). The key question is about the source of carbon atoms in this process.
Step 3:: Analyze the Carbon Source
In photosynthesis, carbon atoms are primarily obtained from carbon dioxide ($$CO_{2}$$) in the atmosphere.
Plants take in carbon dioxide through tiny pores in their leaves called stomata.
Step 4:: Chemical Reaction of Photosynthesis
6CO_{2} + 6H_{2}O + \text{light energy} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}
The basic photosynthesis reaction can be represented as:
Step 5:: Examine the Options
A. Carbonyl groups - Not the primary carbon source B. Phosphate groups - Related to energy transfer, not carbon source C. NADPH - An electron carrier, not a carbon source D. Carbon dioxide - The primary source of carbon atoms
Step 6:: Reasoning
Carbon dioxide molecules are the direct source of carbon atoms that are incorporated into the sugar molecule during photosynthesis through a process called carbon fixation in the Calvin cycle.
Final Answer
Carbon dioxide Key Insight: Carbon dioxide from the air is the fundamental source of carbon atoms used to build sugar molecules during photosynthesis.
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