Question 1

Streptococcus lacks an electron transport chain. How does this bacterium reoxidize NADH? Where is the NADH formed?

Accepted Answer

Streptococcus is a genus of bacteria tha

Question 2

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

Accepted Answer

A)  It occurs in glycolysis. 
B)  It involves the direct transfer of a high- energy phosphate group from an intermediate metabolic compound to ADP. 
C)  The oxidation of intermediate metabolic compounds releases energy that is used to generate ATP. 
D)  No final electron acceptor is required. 
E)  It occurs in the Krebs cycle. 
A)  It occurs in glycolysis. 
B)  It involves the direct transfer of a high- energy phosphate group from an intermediate metabolic compound to ADP. 
C)  The oxidation of intermediate metabolic compounds releases energy that is used to generate ATP. 
D)  No final electron acceptor is required. 
E)  It occurs in the Krebs cycle.

Question 3

Figure 5.8
  
-In Figure 5.8, where is ATP produced?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
E)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 4

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

Accepted Answer

A)  aerobic respirers. 
B)  homolactic fermenters. 
C)  alcohol fermenters. 
D)  anaerobic respirers. 
E)  heterolactic fermenters. 
A)  aerobic respirers. 
B)  homolactic fermenters. 
C)  alcohol fermenters. 
D)  anaerobic respirers. 
E)  heterolactic fermenters.

Question 5

Assume you are working for a chemical company and are responsible for growing a yeast culture that produces ethanol. The yeasts are growing well on the maltose medium but are not producing alcohol. What is the most likely explanation?

Accepted Answer

A)  The maltose is toxic. 
B)  O2 is in the medium. 
C)  The temperature is too low. 
D)  The temperature is too high. 
E)  Not enough protein is provided. 
A)  The maltose is toxic. 
B)  O2 is in the medium. 
C)  The temperature is too low. 
D)  The temperature is too high. 
E)  Not enough protein is provided.

Question 6

Which of the following compounds is NOT an enzyme?

Accepted Answer

A)  coenzyme A 
B)  cellulase 
C)  fi- galactosidase 
D)  sucrase 
E)  dehydrogenase 
A)  coenzyme A 
B)  cellulase 
C)  fi- galactosidase 
D)  sucrase 
E)  dehydrogenase

Question 7

Figure 5.1
  
-Which compound is being reduced in the reaction shown in Figure 5.1?

Accepted Answer

A)  NADH 
B)  NAD+ 
C)  a- ketoglutaric acid and NAD+ 
D)  isocitric acid and a- ketoglutaric acid 
E)  NADH and isocitric acid 
A)  NADH 
B)  NAD+ 
C)  a- ketoglutaric acid and NAD+ 
D)  isocitric acid and a- ketoglutaric acid 
E)  NADH and isocitric acid

Question 8

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

Accepted Answer

A)  H2O. 
B)  H2S. 
C)  C6H12O6. 
D)  chlorophyll. 
E)  CO2. 
A)  H2O. 
B)  H2S. 
C)  C6H12O6. 
D)  chlorophyll. 
E)  CO2.

Question 9

Which of the following is TRUE about this reaction?

Accepted Answer

A)  This process occurs anaerobically. 
B)  This process requires O2. 
C)  This process requires the electron transport system. 
D)  This process requires light. 
E)  This process requires O2 and the electron transport system. 
A)  This process occurs anaerobically. 
B)  This process requires O2. 
C)  This process requires the electron transport system. 
D)  This process requires light. 
E)  This process requires O2 and the electron transport system.

Question 10

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

Accepted Answer

A)  a- ketoglutaric acid 
B)  ADP 
C)  NADH 
D)  citric acid 
E)  NAD+ 
A)  a- ketoglutaric acid 
B)  ADP 
C)  NADH 
D)  citric acid 
E)  NAD+

Question 11

Which of the following statements about anaerobic respiration is FALSE?

Accepted Answer

A)  The complete Kreb's cycle is utilized. 
B)  It yields lower amounts of ATP when compared to aerobic respiration. 
C)  It involves the reduction of an organic final electron acceptor. 
D)  It generates ATP. 
E)  It requires cytochromes. 
A)  The complete Kreb's cycle is utilized. 
B)  It yields lower amounts of ATP when compared to aerobic respiration. 
C)  It involves the reduction of an organic final electron acceptor. 
D)  It generates ATP. 
E)  It requires cytochromes.

Question 12

Which of the following is the best definition of fermentation?

Accepted Answer

A)  the partial oxidation of glucose with organic molecules serving as electron acceptors 
B)  the complete catabolism of glucose to CO2 and H2O 
C)  the partial reduction of glucose to pyruvic acid 
D)  the production of energy by oxidative- level phosphorylation 
E)  the production of energy by both substrate and oxidative phosphorylation 
A)  the partial oxidation of glucose with organic molecules serving as electron acceptors 
B)  the complete catabolism of glucose to CO2 and H2O 
C)  the partial reduction of glucose to pyruvic acid 
D)  the production of energy by oxidative- level phosphorylation 
E)  the production of energy by both substrate and oxidative phosphorylation

Question 13

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 to

Accepted Answer

A)  stay the same. 
B)  decrease. 
C)  increase. 
A)  stay the same. 
B)  decrease. 
C)  increase.

Question 14

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

Accepted Answer

A)  chemoautotroph 
B)  photoautotroph 
C)  photoheterotroph 
D)  chemoheterotroph 
A)  chemoautotroph 
B)  photoautotroph 
C)  photoheterotroph 
D)  chemoheterotroph

Question 15

Figure 5.8
  
-What is the most acidic place in Figure 5.8?

Accepted Answer

A)  a 
B)  b 
C)  c 
D)  d 
E)  e 
A)  a 
B)  b 
C)  c 
D)  d 
E)  e

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A)  It is reduced to lactic acid. 
B)  It is catabolized in glycolysis. 
C)  It reacts with oxaloacetate to form citrate. 
D)  It is converted into acetyl CoA. 
E)  It is oxidized in the electron transport chain. 
A)  It is reduced to lactic acid. 
B)  It is catabolized in glycolysis. 
C)  It reacts with oxaloacetate to form citrate. 
D)  It is converted into acetyl CoA. 
E)  It is oxidized in the electron transport chain.

Exam 5: Microbial Metabolism

Streptococcus lacks an electron transport chain. How does this bacterium reoxidize NADH? Where is the NADH formed?

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

Figure 5.8 -In Figure 5.8, where is ATP produced?

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

Assume you are working for a chemical company and are responsible for growing a yeast culture that produces ethanol. The yeasts are growing well on the maltose medium but are not producing alcohol. What is the most likely explanation?

Which of the following compounds is NOT an enzyme?

Figure 5.1 -Which compound is being reduced in the reaction shown in Figure 5.1?

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

Which of the following is TRUE about this reaction?

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

Which of the following statements about anaerobic respiration is FALSE?

Which of the following is the best definition of fermentation?

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 to

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

Figure 5.8 -What is the most acidic place in Figure 5.8?

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

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

The Microbial World and You

Chemical Principles

Observing Microorganisms Through a Microscope

Functional Anatomy of Prokaryotic and Eukaryotic Cells

Microbial Growth

The Control of Microbial Growth

Microbial Genetics

Biotechnology and Recombinant Dna

Classification of Microorganisms

The Prokaryotes: Domains Bacteria and Archaea

The Eukaryotes: Fungi, Algae, Protozoa, and Helminths

Viruses, Viroids, and Prions

Principles of Disease and Epidemiology

Microbial Mechanisms of Pathogenicity

Innate Immunity: Nonspecific Defenses of the Host

Adaptive Immunity: Specific Defenses of the Host

Practical Applications of Immunology

Disorders Associated With the Immune System

Antimicrobial Drugs

Microbial Diseases of the Skin and Eyes

Microbial Diseases of the Nervous System

Microbial Diseases of the Cardiovascular and Lymphatic Systems

Microbial Diseases of the Respiratory System

Microbial Diseases of the Digestive System

Microbial Diseases of the Urinary and Reproductive Systems

Environmental Microbiology

Applied and Industrial Microbiology

Filters

In green and purple bacteria, electrons to reduce CO₂can come from