Cellular respiration

Question 1

What are the four major phases of cellular respiration

Answer 1

Glycolysis
Pyruvate decarboxylation
Citric acid cycle
Oxidative phosphorylation

Question 2

What does glycolysis do in cellular respiration

Answer 2

• Catabolic pathway in which carbohydrates are metabolized
• 10 enzyme catalyzed reactions are coupled together in cytosol for cannibalism of glucose
• 6 carbon molecules of glucose /3 carbon molecules of pyruvate
• ATP hydrolysis empathy energy required in initial steps
• most energy released is captured by ATP & NADH

Question 3

What does pyruvate decarboxylation do in cellular respiration

Answer 3

• The carboxyl group of pyruvate is removed to form a molecule of carbon dioxide released from cell
• remaining acetyl group is transferred to small molecule CoA to form acetyl-CoA
• some released energy is captured in NADH

Question 4

What does citric acid cycle do in cellular respiration

Answer 4

• 8 enzyme catalyze steps begin with transfer of acetyl group form acetyl-CoA to oxaloacetate, forming citrate-ionized form of citric acid
• 2 molecules of carbon dioxide released/ acetyl-CoA molecule that enters during every turn cycle

Question 5

What does oxidative phosphorylation and do in cellular respiration

Answer 5

• 2 coupled phases: ETC & chemiosmosis
• electrons delivered to ETC from glycolysis, pyruvate decarboxylation and citric acid by NADH & FADH2
• potential energy gredient used to drive phosphorylation of ADP to ATP by ATP synthesis

Question 6

Digesting happens through what

Answer 6

Breakdown of nutritional macromolecules such as carbohydrates, proteins, and lipids