Question

1 multiple choice 10 points which of the following sequences correctly describes cellular respiration? glycolysis > krebs cycle > oxidative phosphorylation > link reaction glycolysis > link reaction> krebs cycle > oxidative phosphorylation link reaction > krebs cycle> glycolysis > oxidative phosphorylation krebs cycle > glycolysis > oxidative phosphorylation> link reaction 2 fill in the blank 10 points reaction type your answer... is an oxidation reaction a. glucose + 6o₂ → 6co₂ + 6h₂o b. nad⁺ + 2e⁻ + h⁺ → nadh c. ½o₂ + 2h⁺ + 2e⁻ → h₂o d. adp + pᵢ → atp

Explanation:

Cellular respiration begins with glycolysis, where glucose is broken down. Then comes the link reaction (pyruvate decarboxylation), followed by the Krebs cycle (citric acid cycle) which further oxidizes the fuel. Finally, oxidative phosphorylation (involving the electron - transport chain and chemiosmosis) occurs. So the correct order is Glycolysis > link reaction> Krebs cycle > oxidative phosphorylation.
For the oxidation - reduction reaction identification: Oxidation is the loss of electrons. In reaction a (Glucose + 6O₂→6CO₂ + 6H₂O), glucose is oxidized (loses electrons as its carbon atoms go from a relatively reduced state in glucose to a more oxidized state in CO₂). Reaction b is a reduction (NAD⁺ gains electrons to form NADH). Reaction c is a reduction (O₂ gains electrons). Reaction d is phosphorylation (not a redox reaction in terms of electron transfer for oxidation - reduction of the main species in the context of cellular respiration redox).

Answer:

1. Glycolysis > link reaction> Krebs cycle > oxidative phosphorylation
2. a