Cellular Respiration and Photosynthesis Concepts

The video tutorial covers Section 9.2, focusing on the Krebs Cycle and the Electron Transport System. It begins with a review of glycolysis and transitions into aerobic respiration, explaining the Krebs Cycle's role in breaking down pyruvic acid into carbon dioxide and extracting energy. The tutorial details the electron transport chain's function in converting ADP to ATP using high-energy electrons from NADH and FADH2. It also explains chemiosmosis and ATP synthesis, highlighting the importance of oxygen as the final electron acceptor. Finally, it compares photosynthesis and cellular respiration, emphasizing their opposite roles in energy flow and gas exchange.

What is the primary role of oxygen in cellular respiration?

• To split glucose molecules

• To act as the final electron acceptor

• To produce pyruvic acid

• To convert ADP into ATP

During the Krebs Cycle, what is pyruvic acid converted into?

• Lactic acid

• Glucose

• Water

• Carbon dioxide

Which molecule is formed when acetyl-CoA enters the Krebs Cycle?

• Citric acid

• Lactic acid

• Glucose

• Pyruvic acid

How many NADH molecules are produced from one turn of the Krebs Cycle?

• Four

• Three

• One

• Two

What is the main function of the Electron Transport Chain?

• To release carbon dioxide

• To split water molecules

• To convert ADP into ATP

• To produce glucose

What is the byproduct of the Electron Transport Chain when oxygen is used?

• Water

• Lactic acid

• Carbon dioxide

• Glucose

How many ATP molecules are produced from one NADH molecule in the Electron Transport Chain?

• Three

• One

• Four

• Two

Which process removes carbon dioxide from the atmosphere?

• Glycolysis

• Fermentation

• Photosynthesis

• Cellular respiration

In what way are photosynthesis and cellular respiration opposite processes?

• Both processes produce glucose

• Photosynthesis releases oxygen, while respiration uses it

• Both processes release carbon dioxide

• Photosynthesis and respiration both occur in mitochondria

What is the total ATP yield from the complete breakdown of one glucose molecule through cellular respiration?

• 36 ATP

• 42 ATP

• 24 ATP

• 18 ATP