Question

which statement below best describes glycolysis? * 1 point
○ glucose is broken down into two pyruvate molecules
○ pyruvate is broken down into acetyl coa and carbon dioxide is released
○ pyruvate molecules are broken down into carbon dioxide, nadh, and atp
○ electrons move across the inner membrane of the mitochondria and produce atp molecules

which step(s) of cellular respiration occurs in the mitochondria? * 1 point
image of a mitochondrion
○ a glycolysis
○ b the krebs cycle
○ c electron transport chain

Explanation:

First Question (About Glycolysis)

• Option 1: Glycolysis is the process where one glucose molecule is broken down into two pyruvate molecules, occurring in the cytoplasm.
• Option 2: The breakdown of pyruvate into Acetyl - CoA (with CO₂ release) is part of the transition reaction before the Krebs cycle, not glycolysis.
• Option 3: The breakdown of pyruvate (or further breakdown in the Krebs cycle and electron transport) to produce CO₂, NADH, and ATP is not glycolysis. Glycolysis produces pyruvate, some ATP, and NADH.
• Option 4: The movement of electrons across the inner mitochondrial membrane to produce ATP is the electron transport chain, not glycolysis.

• Glycolysis (Option A) occurs in the cytoplasm, not the mitochondria.
• The Krebs Cycle (Option B) occurs in the mitochondrial matrix.
• The Electron Transport Chain (Option C) occurs in the inner mitochondrial membrane.

Answer:

Glucose is broken down into two pyruvate molecules

Second Question (Steps of Cellular Respiration in Mitochondria)