Multiple Choice
Why are the genes involved in lactose metabolism considered to be an operon in prokaryotic cells?
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Intro to Organic Chemistry
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Which of the following accurately describes the C4 photosynthesis pathway?
A
C4 photosynthesis is less efficient than C3 photosynthesis under high light and temperature conditions.
B
C4 photosynthesis does not involve the Calvin cycle.
C
C4 photosynthesis occurs only in aquatic plants.
D
C4 photosynthesis involves the initial fixation of CO2 into a four-carbon compound in mesophyll cells.
Verified step by step guidance1
Understand the context: C4 photosynthesis is a process used by certain plants to efficiently fix carbon dioxide (CO2) in hot and dry environments. It is an adaptation to minimize photorespiration.
Identify the key feature of C4 photosynthesis: The process involves the initial fixation of CO2 into a four-carbon compound, typically oxaloacetate, in the mesophyll cells. This is a distinguishing feature from C3 photosynthesis, where CO2 is directly fixed into a three-carbon compound.
Recognize the role of mesophyll cells: In C4 plants, CO2 is initially fixed in the mesophyll cells, forming a four-carbon compound. This compound is then transported to bundle-sheath cells where the Calvin cycle occurs.
Clarify the efficiency aspect: C4 photosynthesis is more efficient than C3 photosynthesis under high light and temperature conditions because it effectively concentrates CO2 at the site of the Calvin cycle, reducing photorespiration.
Note the types of plants: C4 photosynthesis is not limited to aquatic plants; it is found in many terrestrial plants, particularly those in hot and arid environments, such as maize and sugarcane.
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