Question 1

A holoenzyme is a combination of a protein and one or more substances called

Accepted Answer

A)  substrates.
B)  apoenzymes.
C)  catalysts.
D)  cofactors.
E)  ribozymes.F) B) and E)
G) A) and D)

Question 2

Which of the following characterize the Calvin cycle?

Accepted Answer

A)  a process that requires light
B)  nitrogen is fixed into an organic form
C)  produces glucose as an end product
D)  produces carbon dioxide and water
E)  produces oxygenF) A) and E)
G) D) and E)

Question 3

Sulfa drugs like Bactrim,given for bacterial infections,inhibit bacteria by blocking folic acid synthesis.The precursor molecule of folic acid is para-amino benzoic acid (PABA) .Interestingly,PABA has a structure very similar to a sulfa drug.If a sulfa drug is present,the bacterial enzyme will bind the sulfa drug because of structural similarity.This is an example of:

Accepted Answer

A)  enzyme induction.
B)  enzyme repression.
C)  noncompetitive inhibition.
D)  competitive inhibition.
E)  catabolite repression.F) B) and D)
G) A) and D)

Question 4

The best way to control a metabolic pathway is to control the fastest enzyme in the series.

Accepted Answer

A) True 
 B)False

Question 5

The term used to describe all of the chemical reactions within a cell is:

Accepted Answer

A)  catabolism.
B)  redox reactions.
C)  phosphorylation.
D)  metabolism.
E)  cellular respiration.F) B) and D)
G) A) and E)

Question 6

In which stage of aerobic respiration is water produced?

Accepted Answer

A)  glycolysis
B)  the Krebs cycle
C)  the electron transport systemD) B) and C)
E) None of the above

Question 7

A type of cofactor would be

Accepted Answer

A)  vitamins.
B)  metallic ions.
C)  active sites.
D)  substrates.
E)  ribozymes.F) D) and E)
G) C) and E)

Question 8

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Accepted Answer

A) True 
 B)False

Question 9

All of the following are exoenzymes except

Accepted Answer

A)  ATP synthase.
B)  streptokinase.
C)  penicillinase.
D)  collagenase.
E)  elastase.F) A) and D)
G) B) and C)

Question 10

Each of the following are electron carriers except

Accepted Answer

A)  NAD.
B)  FAD.
C)  NADP.
D)  FADP.E) C) and D)
F) B) and D)

Question 11

The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase,as indicated by the results of the phenylalanine test that was run.This enzyme facilitates the removal of a(n) ____ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.

Accepted Answer

A)  carboxyl
B)  amino
C)  phosphate
D)  hydroxylE) A) and C)
F) All of the above

Question 12

Enzymes that are only produced when substrate is present are termed

Accepted Answer

A)  exoenzymes.
B)  endoenzymes.
C)  constitutive enzymes.
D)  induced enzymes.
E)  conjugated enzymes.F) A) and D)
G) A) and E)

Question 13

Glycolysis uses 2 ATP,produces

Accepted Answer

A)  2 ATP,and requires oxygen.
B)  2 ATP without oxygen.
C)  4 ATP,and requires oxygen.
D)  4 ATP all without oxygen.E) All of the above
F) C) and D)

Question 14

Each of the following are true of enzymes except

Accepted Answer

A)  they can be used over and over.
B)  they may or may not require cofactors.
C)  their active site is specific to the substrate.
D)  they increase the activation energy of a reaction.
E)  their action may involve minerals.F) A) and B)
G) C) and D)

Question 15

Photosynthesis occurs in chloroplasts of prokaryotes.

Accepted Answer

A) True 
 B)False

Question 16

Each NADH that enters the electron transport system gives rise to _____ ATP.

Accepted Answer

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

Question 17

During which of the phases of cellular respiration is the majority of ATP formed?

Accepted Answer

A)  electron transport system
B)  the Krebs cycle
C)  glycolysis
D)  processing of pyruvic acid for the Krebs cycle
E)  All phases produce the same number of ATP molecules.F) B) and C)
G) A) and B)

Question 18

In addition to electrons,which of the following is also involved in electron transfer?

Accepted Answer

A)  ADP
B)  glucose
C)  carbon
D)  hydrogen
E)  carbon dioxideF) A) and C)
G) B) and E)

Question 19

Glyceraldehyde-3-phosphate is an intermediary of glycolysis that can also be utilized in biosynthetic pathways.

Accepted Answer

A) True 
 B)False

Question 20

As the electron transport carriers shuttle electrons,they actively pump _____ into the outer membrane compartment,setting up a concentration gradient called the proton motive force.

Accepted Answer

A)  ATP
B)  phosphate
C)  hydrogen ions
D)  oxygen
E)  NADHF) B) and D)
G) A) and C)

Exam 8: Microbial Metabolism: the Chemical Crossroads of Life

In addition to electrons,which of the following is also involved in electron transfer?

Correct Answer
verified

A holoenzyme is a combination of a protein and one or more substances called

Correct Answer
verified

Enzymes that are only produced when substrate is present are termed

Correct Answer
verified

Which of the following characterize the Calvin cycle?

Correct Answer
verified

Photosynthesis occurs in chloroplasts of prokaryotes.

Correct Answer
verified

Glyceraldehyde-3-phosphate is an intermediary of glycolysis that can also be utilized in biosynthetic pathways.

Correct Answer
verified

Correct Answer
verified

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Correct Answer
verified

Each of the following are true of enzymes except

Correct Answer
verified

In which stage of aerobic respiration is water produced?

Correct Answer
verified

All of the following are exoenzymes except

Correct Answer
verified

A type of cofactor would be

Correct Answer
verified

The term used to describe all of the chemical reactions within a cell is:

Correct Answer
verified

During which of the phases of cellular respiration is the majority of ATP formed?

Correct Answer
verified

Each of the following are electron carriers except

Correct Answer
verified

Correct Answer
verified

The best way to control a metabolic pathway is to control the fastest enzyme in the series.

Correct Answer
verified

Glycolysis uses 2 ATP,produces

Correct Answer
verified

As the electron transport carriers shuttle electrons,they actively pump _____ into the outer membrane compartment,setting up a concentration gradient called the proton motive force.

Correct Answer
verified

Each NADH that enters the electron transport system gives rise to _____ ATP.

Correct Answer
verified

Exam 8: Microbial Metabolism: the Chemical Crossroads of Life

In addition to electrons,which of the following is also involved in electron transfer?

Correct AnswerverifiedShow Answer

A holoenzyme is a combination of a protein and one or more substances called

Correct AnswerverifiedShow Answer

Enzymes that are only produced when substrate is present are termed

Correct AnswerverifiedShow Answer

Which of the following characterize the Calvin cycle?

Correct AnswerverifiedShow Answer

Photosynthesis occurs in chloroplasts of prokaryotes.

Correct AnswerverifiedShow Answer

Glyceraldehyde-3-phosphate is an intermediary of glycolysis that can also be utilized in biosynthetic pathways.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

ATP synthase is a complex enzyme needed for oxidative phosphorylation.

Correct AnswerverifiedShow Answer

Each of the following are true of enzymes except

Correct AnswerverifiedShow Answer

In which stage of aerobic respiration is water produced?

Correct AnswerverifiedShow Answer

All of the following are exoenzymes except

Correct AnswerverifiedShow Answer

A type of cofactor would be

Correct AnswerverifiedShow Answer

The term used to describe all of the chemical reactions within a cell is:

Correct AnswerverifiedShow Answer

During which of the phases of cellular respiration is the majority of ATP formed?

Correct AnswerverifiedShow Answer

Each of the following are electron carriers except

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The best way to control a metabolic pathway is to control the fastest enzyme in the series.

Correct AnswerverifiedShow Answer

Glycolysis uses 2 ATP,produces

Correct AnswerverifiedShow Answer

As the electron transport carriers shuttle electrons,they actively pump _____ into the outer membrane compartment,setting up a concentration gradient called the proton motive force.

Correct AnswerverifiedShow Answer

Each NADH that enters the electron transport system gives rise to _____ ATP.

Correct AnswerverifiedShow Answer

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