Microbial Metabolism: Key Concepts, Pathways, and Energy Production

What is metabolism?

Metabolism is the sum of all chemical reactions that occur within a living organism, including both anabolic and catabolic processes.

What is the difference between anabolism and catabolism?

Anabolism is the metabolic pathway that builds molecules and requires energy, while catabolism is the pathway that breaks down molecules to release energy.

What is the role of ATP in metabolism?

ATP serves as an energy carrier that transfers energy from catabolic reactions to anabolic reactions, facilitating cellular processes.

What is oxidation-reduction?

Oxidation-reduction (redox) refers to chemical reactions that involve the transfer of electrons between two substances, resulting in changes in oxidation states.

What are the three types of phosphorylation reactions that generate ATP?

The three types of phosphorylation are substrate-level phosphorylation, oxidative phosphorylation, and photophosphorylation.

What is the overall function of metabolic pathways?

Metabolic pathways are sequences of chemical reactions that convert substrates into products, allowing for energy production and the synthesis of necessary biomolecules.

What is the yield of glycolysis?

Glycolysis yields 2 ATP molecules, 2 NADH molecules, and 2 pyruvate molecules from one glucose molecule.

What are the products of the Krebs cycle?

The Krebs cycle produces ATP, NADH, FADH2, and carbon dioxide as waste products from the oxidation of acetyl-CoA.

What is the chemiosmotic model for ATP generation?

The chemiosmotic model describes how ATP is generated through the movement of protons across a membrane, creating a proton gradient that drives ATP synthase.

What is the difference between aerobic and anaerobic respiration?

Aerobic respiration requires oxygen and produces more ATP, while anaerobic respiration occurs without oxygen and yields less ATP.

What are the products of fermentation?

Fermentation produces various end products, such as ethanol, lactic acid, and carbon dioxide, depending on the organism and substrate.

How do lipids undergo catabolism?

Lipids are catabolized through processes such as beta-oxidation, which breaks down fatty acids into acetyl-CoA for energy production.

What is the difference between cyclic and noncyclic photophosphorylation?

Cyclic photophosphorylation involves the flow of electrons in a cycle to produce ATP, while noncyclic photophosphorylation produces both ATP and NADPH by using electrons from water.

What are the light-dependent reactions of photosynthesis?

Light-dependent reactions convert light energy into chemical energy in the form of ATP and NADPH, occurring in the thylakoid membranes.

What are amphibolic pathways?

Amphibolic pathways are metabolic pathways that function in both catabolism and anabolism, allowing for the interconversion of molecules.