Fermentation and Cellular Respiration Concepts

The lecture covers microbial metabolism, focusing on catabolic pathways: aerobic respiration, anaerobic respiration, and fermentation. It explains how these pathways break down glucose to produce ATP, with aerobic respiration yielding the most energy. The Krebs cycle and electron transport chain are detailed, highlighting their roles in energy production. Anabolism is also discussed, showing how smaller molecules are synthesized into macromolecules. The lecture emphasizes the balance between catabolism and anabolism in cellular processes.

What is the primary difference between catabolism and anabolism?

• Catabolism builds up macromolecules, while anabolism breaks them down.

• Catabolism breaks down nutrients, while anabolism builds up macromolecules.

• Both catabolism and anabolism break down nutrients.

• Both catabolism and anabolism build up macromolecules.

In aerobic respiration, what is the final electron acceptor?

• Nitrate

• Oxygen

• Sulfate

• Carbon dioxide

Which of the following is NOT a characteristic of anaerobic respiration?

• Involves glycolysis

• Uses oxygen as the final electron acceptor

• Can occur in the absence of oxygen

• Uses non-oxygen compounds as electron acceptors

What is the main product of fermentation?

• Carbon dioxide

• Alcohols and acids

• Water

• Oxygen

Which process yields the least amount of ATP per glucose molecule?

• Aerobic respiration

• Photosynthesis

• Fermentation

• Anaerobic respiration

What is the role of NADH and FADH2 in the electron transport chain?

• They convert ADP into ATP.

• They transport electrons to the electron transport chain.

• They break down glucose into pyruvic acid.

• They act as final electron acceptors.

How does fermentation differ from aerobic and anaerobic respiration?

• It does not involve the Krebs cycle.

• It produces more ATP than aerobic respiration.

• It uses an electron transport chain.

• It requires oxygen.

What is the primary function of the Krebs cycle?

• To convert glucose into pyruvic acid

• To generate ATP through substrate-level phosphorylation

• To reduce NAD+ and FAD to NADH and FADH2

• To act as the final electron acceptor

Which process is used by organisms that lack an electron transport chain?

• Fermentation

• Anaerobic respiration

• Photosynthesis

• Aerobic respiration

Which of the following is a feature of anabolism?

• Uses oxygen as the final electron acceptor

• Produces alcohols and acids

• Builds macromolecules from smaller units

• Breaks down glucose into pyruvic acid