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Multiple Choice
What are two possible metabolic pathways for acetyl-CoA once it has been produced in the cell?
A
It can be used in glycolysis or stored as starch.
B
It can be converted into glucose or used in protein synthesis.
C
It can be stored as glycogen or used in nucleotide synthesis.
D
It can enter the citric acid cycle or be used in fatty acid synthesis.
Verified step by step guidance
1
Understand the role of acetyl-CoA in cellular metabolism. Acetyl-CoA is a central metabolite that plays a key role in energy production and biosynthesis.
Recognize that acetyl-CoA is primarily involved in two major pathways: the citric acid cycle (also known as the Krebs cycle or TCA cycle) and fatty acid synthesis.
In the citric acid cycle, acetyl-CoA combines with oxaloacetate to form citrate, which undergoes a series of reactions to produce ATP, NADH, and FADH2, essential for cellular energy.
In fatty acid synthesis, acetyl-CoA serves as a building block for the synthesis of long-chain fatty acids, which are important for energy storage and membrane structure.
Note that acetyl-CoA is not directly involved in glycolysis, glucose conversion, protein synthesis, glycogen storage, or nucleotide synthesis, which are separate metabolic pathways.