Multiple Choice
What is the primary purpose of glycolysis in cellular metabolism?
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8. Respiration
Glycolysis
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Why are phosphate groups added to glucose during the first phase of glycolysis?
A
To facilitate the release of carbon dioxide
B
To trap glucose inside the cell
C
To convert glucose into a lipid
D
To increase the energy content of glucose
Verified step by step guidance1
Understand the process of glycolysis: Glycolysis is the metabolic pathway that converts glucose into pyruvate, releasing energy and producing ATP. It occurs in the cytoplasm of cells.
Recognize the role of phosphate groups: In the first phase of glycolysis, glucose is phosphorylated, meaning phosphate groups are added to it. This is crucial for the process.
Identify the purpose of phosphorylation: Adding phosphate groups to glucose helps trap it inside the cell. This is because the phosphorylated glucose cannot easily cross the cell membrane, ensuring it remains available for glycolysis.
Consider the energy aspect: Phosphorylation also prepares glucose for subsequent steps in glycolysis, where energy is extracted. It does not directly increase the energy content of glucose but facilitates energy extraction later.
Clarify misconceptions: Phosphate addition does not facilitate the release of carbon dioxide nor convert glucose into a lipid. Its primary role is to trap glucose inside the cell and prepare it for energy extraction.
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