Cellular Respiration

What is the main purpose of glycolysis in cellular respiration?

• To produce oxygen

• To break down glucose into pyruvate

• To generate carbon dioxide

• To synthesize DNA

What is the net gain of ATP molecules produced directly from glycolysis per molecule of glucose?

• 2

• 4

• 6

• 8

• Calvin Cycle

• Krebs Cycle

• Glycolysis

• Light-dependent reactions

What is the main difference between aerobic and anaerobic respiration?

• Aerobic respiration requires oxygen, anaerobic does not

• Anaerobic respiration produces more ATP

• Aerobic respiration occurs in the cytoplasm only

• Anaerobic respiration uses the electron transport chain

Which of the following is a product of anaerobic respiration in muscle cells?

• Lactic acid

• Ethanol

• Oxygen

• Glucose

Arrange the following stages of cellular respiration in the correct order: Electron Transport Chain, Glycolysis, Krebs Cycle.

• Glycolysis, Krebs Cycle, Electron Transport Chain

• Krebs Cycle, Glycolysis, Electron Transport Chain

• Electron Transport Chain, Glycolysis, Krebs Cycle

• Glycolysis, Electron Transport Chain, Krebs Cycle

If a cell is deprived of oxygen, which process will it rely on to produce ATP?

• Electron Transport Chain

• Anaerobic respiration (fermentation)

• Krebs Cycle

• Calvin Cycle

During the Krebs Cycle, which gas is released as a waste product?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which of the following best explains why the electron transport chain is important for ATP production?

• It directly breaks down glucose to release energy

• It uses high-energy electrons to pump protons and create a gradient for ATP synthesis

• It converts pyruvate into lactic acid

• It stores energy in the form of glycogen

A student measures the ATP output of a cell under both aerobic and anaerobic conditions. The cell produces 36 ATP per glucose molecule aerobically, but only 2 ATP anaerobically. What can the student conclude about the efficiency of these processes?

• Anaerobic respiration is more efficient than aerobic respiration

• Both processes are equally efficient

• Aerobic respiration is much more efficient at producing ATP than anaerobic respiration

• ATP production is unrelated to oxygen presence