Question

5 multiple choice 5 points the primary role of oxygen in cellular respiration is to yield energy in the form of atp as it is passed down the respiratory chain. acts as an acceptor for electrons and hydrogen, forming water. combine with carbon, forming co2. combine with lactate, forming pyruvate. 6 multiple choice 5 points in the presence of a metabolic poison that specifically and completely inhibits all function of mitochondrial atp synthase, which of the following would you expect? a decrease in the ph difference across the inner mitochondrial membrane an increase in the ph difference across the inner mitochondrial membrane increased synthesis of atp increased oxygen consumption an accumulation of nad+

Explanation:

For question 5: In cellular respiration, oxygen acts as the final electron acceptor in the electron - transport chain. Electrons are passed down the chain, and oxygen combines with electrons and hydrogen ions (\(H^{+}\)) to form water (\(H_{2}O\)). It is not directly involved in yielding ATP (ATP is mainly formed through chemiosmosis), combining with carbon to form \(CO_{2}\) (this occurs in the citric acid cycle with other molecules), or combining with lactate to form pyruvate (which is part of fermentation).

For question 6: ATP synthase is involved in chemiosmosis, where protons (\(H^{+}\)) flow back into the mitochondrial matrix through ATP synthase, driving ATP synthesis. If ATP synthase is inhibited, protons cannot flow back into the matrix easily. As a result, protons accumulate in the inter - membrane space, increasing the pH difference (lower pH in the inter - membrane space compared to the matrix, and the difference becomes larger as protons cannot be used to make ATP). Inhibition of ATP synthase would not lead to increased ATP synthesis. Oxygen consumption is related to the electron - transport chain (where oxygen is the final electron acceptor), and inhibition of ATP synthase does not directly increase oxygen consumption. Also, \(NAD^{+}\) accumulation is more related to the oxidation of NADH in the electron - transport chain, not directly to ATP synthase inhibition.

Answer:

1. acts as an acceptor for electrons and hydrogen, forming water.
2. an increase in the pH difference across the inner mitochondrial membrane