Exam 9: Cellular Respiration and Fermentation

When one of the eight Krebs cycle intermediates is added to the respiration medium of living cells,like yeast,what happens to the rates of ATP and carbon dioxide production?

The inner mitochondrial membrane normally

The constituents of the electron transport chain have similar capabilities,with the exception of ubiquinone (coenzyme Q).What is different about ubiquinone?

A substrate-level phosphorylation occurs in the Krebs cycle where

Canine phosphofructokinase (PFK)deficiency afflicts springer spaniels,affecting an estimated 10% of the breed.PFK is the glycolytic enzyme that phosphorylates fructose-1-phosphate and catalyzes the committed step in glycolysis.Given its critical role in glycolysis,one implication of the genetic defect resulting in PFK deficiency in dogs is

In the energy-yielding phase of glycolysis,energy is extracted in the form of

What is the function of coenzyme A in the Krebs cycle?

Figure 9.3 -Refer to Figure 9.3.Which of these statements concerning the following reaction is true? Malate + NAD⁺ → oxaloacetate + NADH + H⁺

-In the figure above,where are the enzymes of the Krebs (citric acid)cycle located? Choose the arrow that corresponds.

During the electron transport chain,cytochrome oxidase catalyzes the transfer for electrons from cytochrome c to oxygen in the mitochondria.Cyanide is a poison that inhibits the enzyme cytochrome oxidase.When cyanide is present,what will happen?

Figure 9.2 -Refer to Figure 9.2.Which reactant molecule becomes reduced in the following chemical reaction? Glyceraldehyde phosphate + NAD⁺ → diphosphoglycerate + NADH + H⁺

ATP production by ATP synthase,requiring a proton gradient across a membrane,occurs in which of the following?

Fatty acids typically have an even number of carbons.They are catabolized by a process called beta-oxidation.The end-products of the metabolic pathway are acetyl groups of acetyl CoA molecules.What is the most likely fate of the acetyl groups?

The enzyme phosphofructokinase is the major regulatory enzyme of glycolysis.It catalyzes

A metabolic pathway,glycolysis,is active when cellular energy levels are ________;the regulatory enzyme,phosphofructokinase,is ________ by ATP.

After glycolysis,but before the Krebs cycle and electron transport chain/oxidative phosphorylation,most of the energy from the original glucose is in the form of which molecule?

Following glycolysis and the Krebs cycle and before the electron transport chain and oxidative phosphorylation,the carbon skeleton of glucose has been broken down to CO₂.Most of the energy from the original glucose at that point is still in the form of

C₆H₁₂O₆ (glucose)+ 6O₂ → 6 CO₂ + 6H₂O Where is most of the water in this reaction produced?

Two ATP molecules are expended in the energy investment phase of glycolysis.Why is this energy necessary to begin the process of glucose catabolism?

What electron carrier(s)function in the Krebs cycle?