Microbial Metabolism chapter review

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Which of the following compounds is NOT an enzyme

Coenzyme A

Which organism is NOT correctly matched to its energy source?

Photoautotroph - CO₂

Which of the following statements about anaerobic respiration is FALSE?

It involves the reduction of an organic final electron acceptor.

What is the fate of pyruvic acid in an organism that uses aerobic respiration

It is converted into acetyl CoA.

Fatty acids are oxidized

The Krebs Cycle.

Which of the following is the best definition of oxidative phosphorylation?

A proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate ATP.

Which of the following statements about substrate-level phosphorylation is FALSE?

The oxidation of intermediate metabolic compounds releases energy that is used to generate
ATP.

Which of the following statements about photophosphorylation is FALSE?

It requires CO₂.

A strictly fermentative bacterium produces energy

By glycolysis only.

The advantage of the pentose phosphate pathway is that it produces all of the following EXCEPT

E) three ATP's.

Three ATP's.

Which of the following statements about beta oxidation is FALSE?

It is a step in glycolysis.

In noncyclic photophosphorylation, O2 is released from

H₂O

Which of the following is the best definition of fermentation?

The partial oxidation of glucose with organic molecules serving as electron acceptors.

Which of the following is NOT necessary for respiration?

Oxygen.

Which one of the following would you predict is an allosteric inhibitor of the Krebs cycle enzyme,
alpha-ketoglutarate dehydrogenase?

E) ADP

NADH.

In green and purple bacteria, electrons to reduce CO₂ can come from

H₂S

Assume you are growing bacteria on a lipid medium that started at pH 7. The action of bacterial
lipases should cause the pH of the medium

The pH of the medium will decrease.

Which of the following uses CO₂ for carbon and H₂ for energy?

Chemoautotroph

Which of the following uses glucose for carbon and energy?

Chemoheterotroph

Which of the following has bacteriochlorophylls and uses alcohols for carbon?

Photoheterotroph

Cyanobacteria are a type of

Photoautotroph.

Which of the following statements are true?

2-ATP is a common intermediate between catabolic and anabolic pathways.
4-Anaerobic organisms are capable of generating ATP via respiration.
5-ATP can be generated by the flow of protons across protein channels.

Microorganisms that catabolize sugars into ethanol and hydrogen gas would be categorized as

B) anaerobic respirers.

Heterolactic Fermenters.

Which of the following statements regarding metabolism is FALSE?

Anabolic reactions are degradative.

Which of the following statements regarding the Entner-Doudoroff pathway is TRUE?

ATP is generated.

An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example of all of the
following EXCEPT

Competitive Inhibition

If a cell is starved for ATP, which of the following pathways would most likely be shut down?

Pentose Phosphate Pathway

Which of the following statements regarding the glycolysis pathway is FALSE?

One molecule of ATP is expanded.

A bacterial culture grown in a glucose-peptide medium causes the pH to increase.The bacteria are
most likely

Using the peptides.

Gallionella bacteria can get energy from the reaction Fe²⁺ → Fe³⁺. This reaction is an example of

E) photophosphorylation.

Oxidation.

Catabolic reactions are generally degradative and hydrolytic.

True

The pentose phosphate pathway can be characterized as an anabolic pathway.

False.

In general, ATP is generated in catabolic pathways and expended in anabolic pathways.

False.

An apoenzyme that loses its coenzyme subunit will be non-functional.

True.

The use of enzymes is necessary to increase the activation energy requirements of a chemical reaction.

False.

Glycolysis is utilized by cells in both respiration and fermentation.

True.

Carbon fixation occurs during the light-independent phase of photosynthesis.

True.

Both respiration and photosynthesis require the use of an electron transport chain.

True.

Both respiration and photosynthesis use water molecules for the donation of hydrogen ions.

False.

Once an enzyme has converted substrates into products, the active site reverts back to its original
form.

True.

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