What is the correct order of events for cellular respiration?
a. glycolysis → Krebs cycle → electron transport chain
b. electron transport chain → glycolysis → Krebs cycle
c. Krebs cycle → glycolysis → electron transport chain
d. glycolysis → electron transport chain → Krebs cycle
a. glycolysis → Krebs cycle → electron transport chain
The correct order of events for cellular respiration is:
a. glycolysis → Krebs cycle → electron transport chain
The correct order of events for cellular respiration is a. glycolysis → Krebs cycle → electron transport chain.
To arrive at this answer, let's break down each option and determine the correct sequence of events:
a. glycolysis → Krebs cycle → electron transport chain: This is the correct order of events. Glycolysis is the first step in cellular respiration, where glucose is broken down into two molecules of pyruvate. The pyruvate then enters the Krebs cycle, which takes place in the mitochondria and generates energy-rich molecules like NADH and FADH2. Finally, the electron transport chain occurs, where these energy-rich molecules are used to produce ATP (adenosine triphosphate), the main energy currency of the cell.
b. electron transport chain → glycolysis → Krebs cycle: This order is incorrect. The electron transport chain should occur after the Krebs cycle and not before glycolysis.
c. Krebs cycle → glycolysis → electron transport chain: This order is incorrect. The Krebs cycle should occur after glycolysis and not before it.
d. glycolysis → electron transport chain → Krebs cycle: This order is incorrect. The Krebs cycle should occur after glycolysis and electron transport chain should occur after the Krebs cycle, not before it.
Therefore, the correct order of events for cellular respiration is a. glycolysis → Krebs cycle → electron transport chain.