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Where does the following reaction take place in a cell? The breakdown of glucose, a six-carbon molecule, into a three-carbon molecule.
In the mitochondria
In the nucleus
In the Golgi apparatus
In the cytoplasm
In the cytoplasm
The breakdown of glucose, a six-carbon molecule, into a three-carbon molecule called pyruvate takes place in the cytoplasm of a cell during the first step of cellular respiration known as glycolysis.
The breakdown of glucose, a six-carbon molecule, into a three-carbon molecule called pyruvate takes place in the cytoplasm of a cell during the first step of cellular respiration known as glycolysis.
Think of glucose as a large 6-seater sofa that won't fit through a narrow doorway in one piece, so it is first disassembled into two smaller 3-seater sections (pyruvate) right in the living room (cytoplasm) before deciding whether to take them further inside.
Glyco (glucose) lysis (splitting) happens in the cyto (cytoplasm) first!
C6тАЛH12тАЛO6тАЛтЖТ2┬а(Pyruvate┬аC3тАЛH4тАЛO3тАЛ)+Energy┬а(ATP,┬аNADH)
In the cytoplasm, glucose (C6тАЛH12тАЛO6тАЛ) undergoes glycolysis, a series of enzyme-catalyzed reactions where one six-carbon glucose molecule is split into two molecules of three-carbon pyruvate. This process occurs in both aerobic and anaerobic respiration and does not require oxygen.
Glycolysis is the first common step for both aerobic and anaerobic respiration.
It converts one 6-carbon glucose into two 3-carbon pyruvate molecules.
The process takes place entirely in the cytoplasm (cytosol) of the cell.
Net gain of energy during glycolysis is 2 ATP molecules per glucose.
Does not require oxygen, allowing rapid energy production under anaerobic conditions.
Provides essential precursor molecules (pyruvate) for the Krebs cycle in mitochondria when oxygen is present.
Yields a very small amount of ATP compared to oxidative phosphorylation in mitochondria.
Cellular respiration in eukaryotic and prokaryotic cells
Anaerobic fermentation in yeast and muscle cells
Mitochondria are the sites for the Krebs cycle and electron transport chain (aerobic respiration stages).
The nucleus houses genetic material (DNA) and controls cellular activities.
The Golgi apparatus modifies, sorts, and packages proteins and lipids.
D is correct тАФ The breakdown of glucose into a three-carbon molecule (pyruvate) takes place in the cytoplasm.
Always remember: Glycolysis = Cytoplasm (no oxygen needed, 6-C to 3-C). Krebs Cycle = Mitochondrial Matrix (oxygen required).
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