Question 1

Enzymes that are always present,regardless of the amount of substrate,are

Accepted Answer

A)  apoenzymes.
B)  exoenzymes.
C)  constitutive enzymes.
D)  regulated enzymes.
E)  endoenzymes.F) All of the above
G) A) and C)

Question 2

When enzyme action stops due to a buildup of end product,this control is called

Accepted Answer

A)  competitive inhibition.
B)  enzyme induction.
C)  enzyme repression.
D)  positive feedback.E) B) and C)
F) A) and B)

Question 3

When the product of reaction A becomes the reactant of reaction B,this exemplifies this type of metabolic pathway:

Accepted Answer

A)  linear.
B)  bidirectional.
C)  convergent.
D)  cyclic.
E)  divergent.F) B) and E)
G) A) and C)

Question 4

The bacterial genus Bacillus can utilize starch as a nutrient by splitting the starch molecule into smaller molecules of glucose,with the addition of water.The enzymes to do this would be classified as:

Accepted Answer

A)  transferases.
B)  oxidoreductases.
C)  ligases.
D)  hydrolases.
E)  isomerases.F) B) and E)
G) A) and B)

Question 5

Fermentation

Accepted Answer

A)  requires an organic electron acceptor.
B)  requires oxygen.
C)  only occurs in aerobic organisms.
D)  is equivalent to aerobic respiration in ATP production.
E)  is the same as anaerobic respiration.F) All of the above
G) B) and E)

Question 6

The step involving ATP,hexokinase,and the phosphorylation of glucose to glucose-6-phosphate is

Accepted Answer

A)  the final step of the Krebs cycle.
B)  the first redox reaction of the electron transport system.
C)  an example of oxidative phosphorylation.
D)  an example of substrate-level phosphorylation.
E)  an example of photophosphorylation.F) B) and E)
G) A) and B)

Question 7

The most likely place where an exoenzyme participates in a chemical reaction is

Accepted Answer

A)  in mitochondria.
B)  within the cell membrane.
C)  in lysosomes.
D)  in cytoplasm.
E)  outside of the cell.F) A) and B)
G) A) and C)

Question 8

Exergonic reactions

Accepted Answer

A)  include synthesis of large carbohydrates.
B)  only occur in heterotrophs.
C)  occur during aerobic cellular respiration.
D)  do not occur in anaerobic cellular respiration.
E)  occur when ADP binds to inorganic phosphate to form ATP.F) None of the above
G) B) and C)

Question 9

Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.

Accepted Answer

A) True 
 B)False

Question 10

Denaturing an apoenzyme will destroy the three-dimensional shape of the protein,making it nonfunctional.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following is not a photosynthetic pigment?

Accepted Answer

A)  carotenoid
B)  leukophyll
C)  phycobilin
D)  chlorophyll
E)  thylakoidF) A) and E)
G) A) and C)

Question 12

Reduction of nitrogen-oxygen ions and compounds by some bacteria is called

Accepted Answer

A)  aerobic respiration.
B)  denitrification.
C)  nitrification.
D)  fermentation.
E)  deamination.F) All of the above
G) None of the above

Question 13

ATP is composed of deoxyribose,adenine,and three phosphate groups.

Accepted Answer

A) True 
 B)False

Question 14

When glucose is broken down by glycolysis during bacterial fermentation,what is the usual net production of ATP?

Accepted Answer

A)  2
B)  3
C)  24
D)  36
E)  38F) A) and B)
G) B) and D)

Question 15

Which of the following is not a process that regenerates ATP?

Accepted Answer

A)  oxidative phosphorylation
B)  reductive phosphorylation
C)  substrate-level phosphorylation
D)  photophosphorylation
E)  autophosphorylationF) B) and C)
G) A) and E)

Question 16

Reactants are converted to products by

Accepted Answer

A)  enzymes releasing energy.
B)  breaking and forming bonds.
C)  enzymes binding to reactants.
D)  reactants releasing energy.E) A) and D)
F) C) and D)

Question 17

Only yeast produce alcohol as a fermentation product.

Accepted Answer

A) True 
 B)False

Question 18

In bacterial cells,the electron transport system is located in the

Accepted Answer

A)  cell membrane.
B)  mitochondria.
C)  chloroplasts.
D)  ribosomes.
E)  cytoplasm.F) A) and C)
G) B) and E)

Question 19

Recently discovered bacteria,inhabiting the ocean floor,undergo photosynthesis using light from chemical reactions,the breaking of mineral crystals or from bubble formation.

Accepted Answer

A) True 
 B)False

Question 20

The reactions of fermentation function to produce _____ molecules for use in glycolysis.

Accepted Answer

A)  pyruvic acid
B)  ATP
C)  NAD
D)  NADH
E)  glucoseF) B) and D)
G) B) and E)

Exam 8: Microbial Metabolism: the Chemical Crossroads of Life

When enzyme action stops due to a buildup of end product,this control is called

Correct AnswerverifiedShow Answer

When glucose is broken down by glycolysis during bacterial fermentation,what is the usual net production of ATP?

Correct AnswerverifiedShow Answer

ATP is composed of deoxyribose,adenine,and three phosphate groups.

Correct AnswerverifiedShow Answer

Enzymes that are always present,regardless of the amount of substrate,are

Correct AnswerverifiedShow Answer

Reduction of nitrogen-oxygen ions and compounds by some bacteria is called

Correct AnswerverifiedShow Answer

Reactants are converted to products by

Correct AnswerverifiedShow Answer

Only yeast produce alcohol as a fermentation product.

Correct AnswerverifiedShow Answer

When the product of reaction A becomes the reactant of reaction B,this exemplifies this type of metabolic pathway:

Correct AnswerverifiedShow Answer

Building block molecules for biosynthetic pathways come from the cell's catabolic pathways and from the environment.

Correct AnswerverifiedShow Answer

Exergonic reactions

Correct AnswerverifiedShow Answer

The most likely place where an exoenzyme participates in a chemical reaction is

Correct AnswerverifiedShow Answer

The step involving ATP,hexokinase,and the phosphorylation of glucose to glucose-6-phosphate is

Correct AnswerverifiedShow Answer

Which of the following is not a photosynthetic pigment?

Correct AnswerverifiedShow Answer

The bacterial genus Bacillus can utilize starch as a nutrient by splitting the starch molecule into smaller molecules of glucose,with the addition of water.The enzymes to do this would be classified as:

Correct AnswerverifiedShow Answer

Recently discovered bacteria,inhabiting the ocean floor,undergo photosynthesis using light from chemical reactions,the breaking of mineral crystals or from bubble formation.

Correct AnswerverifiedShow Answer

Denaturing an apoenzyme will destroy the three-dimensional shape of the protein,making it nonfunctional.

Correct AnswerverifiedShow Answer

Fermentation

Correct AnswerverifiedShow Answer

Which of the following is not a process that regenerates ATP?

Correct AnswerverifiedShow Answer

In bacterial cells,the electron transport system is located in the

Correct AnswerverifiedShow Answer

The reactions of fermentation function to produce _____ molecules for use in glycolysis.

Correct AnswerverifiedShow Answer

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