Exam 7: How Cells Harvest Energy

Cytochromes contain a heme group similar to that in hemoglobin.The iron atom (Fe)in the center of the group can be oxidized and reduced.If someone was suffering from iron deficiency anemia,which stage of cellular respiration would be most affected?

As a forensic pathologist,you have just completed an autopsy of a poisoning victim.After a thorough examination,you conclude that the victim died of cyanide poisoning.You know that cyanide binds to the cytochrome oxidase complex,and therefore list the official cause of death as suffocation due to cyanide exposure.However,a more technical explanation would be that all of the following aspects of cellular respiration were inhibited except

Regardless of the electron or hydrogen acceptor used,one of the products of fermentation is always

Because the chemical formation of ATP is driven by a diffusion force similar to osmosis,this process is referred to as ___________.

The Krebs cycle occurs in the mitochondria.There are nine biochemical reactions involved in the Krebs cycle,and they are highly ordered.Select the correct order from the following choices.(Note: These are abbreviated and do not show NAD,ADP,ATP,or FAD. )

The return of the protons into the mitochondrial matrix through mitochondrial membrane channels occurs by the process of _________.

Glucose is broken down to carbon dioxide and water in organisms which breathe air in a process called ________ respiration.

What type of cell respiration occurs when an organic molecule accepts hydrogen atoms?

Which of the following statements accurately reflects the process of glycolysis?

The electron transport chain,a series of membrane-associated electron carriers,loses most of the energy by driving several transmembrane

After eating lunch on a very cold winter day,you begin the long walk across campus to your next class.During your walk you begin thinking about glucose catabolism and the high carbohydrate meal you just consumed.As the cold wind picks up,you find yourself hoping that a lot of the energy released gets converted to heat.Which of the following statements concerning catabolism of glucose are false?

The end-product of glycolysis is

At least 90% of organisms on the earth are heterotrophs.Examples include all of the following except

The first stage of cellular respiration,and the oldest in terms of evolution is

Many of the antiviral drugs currently used to treat HIV/AIDS also interfere with an enzyme that helps mitochondria multiply.Treatment can therefore result in a decrease in the number of mitochondria found in certain tissues.Given this information,which of the following might you expect to see in patients treated with antiviral drugs?

________ depend on energy stored in chemical bonds by autotrophs for their food energy.

Oxidized form of the most common electron carrier;needed in both glycolysis and Krebs cycle.

You arrive at your second home in the mountains looking forward to a relaxing vacation.Unfortunately,when you turn on the water you smell hydrogen sulfide (H₂S)gas.After some research,you find out that the H₂S may be due to the presence of sulfur bacteria living in your pipes.Which of the following molecules would these bacteria use as an electron acceptor?

When substrate-level phosphorylation occurs,it means that

The coenzyme electron carriers produced in the Krebs cycle are