Bio Ch 9

Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present or absent?

glycolysis

Where does the citric acid cycle occur in eukaryotes?

In the matrix of the mitochondria

The primary role of oxygen in cellular respiration is to _____.

act as an acceptor for electrons and hydrogen, forming water

Glycolysis is active when cellular energy levels are _____; the regulatory enzyme, phosphofructokinase, is _____ by ATP.

low; inhibited

For the oxidation of pyruvate shown in the figure below, which answer correctly identifies molecules involved in the positive (+) and negative (-) control of this reaction?

A. +: NAD+, CoA, AMP; -: acetyl CoA, NADH, ATP

What molecule produced during the citric acid cycle feeds into the electron transport chain? See Section 9.4 ( page 198) .

FADH2

After glucose is fully oxidized, where is most of its energy stored?

Most of its energy is stored in the form of NADH

What would be the effect of abundant ATP on the citric acid cycle? See Section 9.4 ( page 198) .

ATP binds at the allosteric regulatory site of the enzyme that combines acetyl CoA and oxaloacetate and slows the citric acid cycle.

What does the chemiosmotic hypothesis claim?

ATP is generated using a protein motive force that is produced by the electron transport chain.

Which answer correctly associates a process in cellular respiration with (1) what goes in and (2) what comes out?

Citric acid cycle: (1) Acetyl CoA; (2) NADH, ATP (or GTP), FADH2,, and CO2

What is the primary function of the reactions that follow glycolysis in a fermentation pathway?

To regenerate NAD+ from NADH, so glycolysis can continue

Where does the citric acid cycle occur in eukaryotes?

in the matrix of the mitochondria

When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____.

oxidized

If you were to expose cells that are undergoing aerobic cellular respiration to a radioactive oxygen isotope in the form of O2, which of the following molecules would you expect to be radiolabeled?

water