College: First year, College: Second year, College: Third year, College: Fourth year
Which of these enters the citric acid cycle?
In the citric acid cycle, ATP molecules are produced by
Which of these is NOT a product of the citric acid cycle?
A glucose molecule is completely broken down to carbon dioxide and water in glycolysis and the citric acid cycle, but together these two processes yield only a few molecules of ATP. What happened to most of the energy that the cell obtains from the oxidation of glucose?
Which statement about the citric acid cycle is correct?
In mitochondrial electron transport, what is the direct role of O2?
How would anaerobic conditions (when no O2 is present) affect the rate of electron transport and ATP production during oxidative phosphorylation? (Note that you should not consider the effect on ATP synthesis in glycolysis or the citric acid cycle.)
NADH and FADH2 are both electron carriers that donate their electrons to the electron transport chain. The electrons ultimately reduce O2 to water in the final step of electron transport. However, the amount of ATP made by electrons from an NADH molecule is greater than the amount made by electrons from an FADH2 molecule.
Which statement best explains why more ATP is made per molecule of NADH than per molecule of FADH2?
When the protein gramicidin is integrated into a membrane, an H+ channel forms and the membrane becomes very permeable to protons (H+ ions). If gramicidin is added to an actively respiring muscle cell, how would it affect the rates of electron transport, proton pumping, and ATP synthesis in oxidative phosphorylation? (Assume that gramicidin does not affect the production of NADH and FADH2 during the early stages of cellular respiration.)
Sort the labels into the correct bin according to the effect that gramicidin would have on each process.
The four stages of cellular respiration do not function independently. Instead, they are coupled together because one or more outputs from one stage functions as an input to another stage. The coupling works in both directions, as indicated by the arrows in the diagram below. In this activity, you will identify the compounds that couple the stages of cellular respiration.
Drag the labels on the left onto the diagram to identify the compounds that couple each stage. Labels may be used once, more than once, or not at all.
Under anaerobic conditions (a lack of oxygen), the conversion of pyruvate to acetyl CoA stops.
Which of these statements is the correct explanation for this observation?
Suppose that a cell’s demand for ATP suddenly exceeds its supply of ATP from cellular respiration.
Which statement correctly describes how this increased demand would lead to an increased rate of ATP production?
What would happen to the cell’s rate of glucose utilization?
The electrons stripped from glucose in cellular respiration end up in which compound?
Match each product of pyruvate metabolism with the condition under which it is produced.
Sort the following items according to whether they are reactants or products in the anaerobic reduction of pyruvate during lactic acid fermentation.
True or false? The potential energy in an ATP molecule is derived mainly from its three phosphate groups.
Which process is not part of the cellular respiration pathway that produces large amounts of ATP in a cell?
Into which molecule are all the carbon atoms in glucose ultimately incorporated during cellular respiration?
Which of the following statements about the electron transport chain is true?
True or false? The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.
In the absence of oxygen, what is the net gain of ATP for each glucose molecule that enters glycolysis?
In most cells, not all of the carbon compounds that participate in glycolysis and the citric acid cycle are converted to carbon dioxide by cellular respiration. What happens to the carbon in these compounds that does not end up as CO2?
The carbon compounds are removed from these processes to serve as building blocks for other complex molecules.
The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is the
Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
In mitochondria, exergonic redox reactions
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
What is the oxidizing agent in the following reaction? Pyruvate + NADH + H+ → Lactate + NAD+
When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
Which of the following statements accurately describes the function of a metabolic pathway involved in cellular respiration?
How will a healthy individual’s ATP production change during an eight-hour fast?
Identify all correct statements about the basic function of fermentation.
Select all that apply.