Cellular respiration quizWhich of the following statements describes the results of this reaction?C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O + Energy *
The synthesis of ATP by oxidative phosphorylation, using the energy released by the movement of protons across the membrane down their electrochemical gradient, is an example of
an endergonic reaction coupled to an exergonic reaction
Why is glycolysis described as having an investment phase and a payoff phase?
it uses stored ATP and then forms a net increase in ATP
The electron transport chain uses energy to pump H+ into which location in eukaryotic cells?
mitochondrial intermembrane space
During aerobic respiration, H2O is formed. Where does the oxygen atom for the formation of the water come from?
molecular oxygen (O2)
Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?
oxidation of pyruvate to acetyl CoA and the citric acid cycle
One function of both alcohol fermentation and lactic acid fermentation is to
oxidize NADH to NAD+.
Which of the following most accurately describes what is happening along the electron transport chain?
Each electron carrier alternates between being reduced and being oxidized.
During glycolysis, when each molecule of glucose is catabolized to two molecules of pyruvate, most of the potential energy contained in glucose is
retained in the two pyruvates
You have a friend who lost 7 kg (about 15 pounds) of fat on a regimen of strict diet and exercise. How did the fat leave her body?
It was released as CO2 and H2O
The ATP made during fermentation is generated by which of the following?
substrate-level phosphorylation
Which of the following normally occurs regardless of whether or not oxygen (O2) is present?
glycolysis
Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed by the reactions of glycolysis?
100%
Which of the following statements describes the results of this reaction?C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O + Energy
C6H12O6 is oxidized and 02 is reduced
Which of the following statements describes NAD+?
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
In cellular respiration, the energy for most ATP synthesis is supplied by
a proton gradient across a membrane
The primary role of oxygen in cellular respiration is to
act as an acceptor for electrons and hydrogen, forming water.
Which kind of metabolic poison would most directly interfere with glycolysis?
an agent that closely mimics the structure of glucose but it is not metabolized
The process by which a proton gradient is used to create ATP
chemiosmosis
Where does glycolysis take place in eukaryotic cells?
cytosol
The process by which glucose is split into pyruvate producing two ATP and two NADH
glycolysis
As a scientist employed by the FDA, you've been asked to sit on a panel to evaluate a pharmaceutical company's application for approval of a new weight loss drug called Fat Away. The company has submitted a report summarizing the results of their animal and human testing. In the report, it was noted that Fat Away works by affecting the electron transport chain. It decreases the synthesis of ATP by making the mitochondrial membrane permeable to H+, which allows H+ to leak from the intermembrane space to the mitochondrial matrix. This effect leads to weight loss. Fat way prevents ATP from being made by
destroying the H+ gradient that allows ATP synthase to work.
A series of membrane-embedded electron carries that ultimately create the hydrogen ion gradient to drive the synthesis of ATP
electron transport chain
A process by which glucose is split to produce two ATP and lactic acid
fermentation
During aerobic respiration, electrons travel downhill in which sequence?
food --> NADH --> electron transport chain --> oxygen
