Question 1

The reason an increase in substrate concentration will not increase the reaction rate indefinitely is because

Accepted Answer

A)  eventually the enzyme will no longer recognize the substrate.
B)  the active site will become saturated with substrate and the enzyme will not be able to go any faster.
C)  another enzyme will take advantage of the excess substrate and use it for a different reaction.
D)  enzymes cannot be used over and over in a reaction.
E)  the enzyme will become denatured.F) A) and D)
G) A) and C)

Question 2

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Accepted Answer

A)  an endergonic reaction
B)  an exergonic reaction
C)  a coupled reaction
D)  a reversible reaction
E)  anabolismF) A) and D)
G) C) and D)

Question 3

Ultimately,humans get their energy from the sun.

Accepted Answer

A) True 
 B)False

Question 4

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Accepted Answer

A) True 
 B)False

Question 5

Most enzymes are

Accepted Answer

A)  lipid molecules.
B)  carbohydrate molecules.
C)  protein molecules.
D)  DNA molecules.
E)  ATP molecules.F) None of the above
G) D) and E)

Question 6

Which of the following statements is not true concerning enzymatic activity?

Accepted Answer

A)  Each enzyme has a preferred pH at which the enzyme reaction rate is highest.
B)  Above a certain temperature,an enzyme will become denatured.
C)  As the temperature increases,most enzymatic reactions will still proceed at the same rate.
D)  Enzymatic reactions proceed quite rapidly.
E)  Enzyme activity increases as substrate concentration increases until the maximum rate is achieved.F) A) and D)
G) A) and C)

Question 7

Explain the factors that will cause a protein to become denatured and what will occur structurally to the protein when it is denatured.

Accepted Answer

The two factors that will denature a pro...

Question 8

Which of the following statements most accurately describes the first law of thermodynamics?

Accepted Answer

A)  One usable form of energy cannot be completely converted into another usable form.
B)  One usable form of energy can be completely converted into another usable form.
C)  Energy cannot be created or destroyed.
D)  Energy can be neither created nor destroyed but it can be changed from one form to another.
E)  Energy cannot be transformed.F) C) and E)
G) All of the above

Question 9

The specificity of an enzyme to a substrate is currently best explained by

Accepted Answer

A)  the "lock and key" model.
B)  the induced-fit model.
C)  the allosteric model.
D)  the receptor model.
E)  the synthase complex model.F) C) and D)
G) B) and E)

Question 10

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Accepted Answer

A) True 
 B)False

Question 11

Poisons are often

Accepted Answer

A)  enzyme inhibitors.
B)  cofactors.
C)  coenzymes.
D)  vitamins.
E)  kinases.F) A) and B)
G) All of the above

Question 12

If A  →\rightarrow→  B  →\rightarrow→  C  →\rightarrow→  D →\rightarrow→  E represents a metabolic pathway,then letter E would be

Accepted Answer

A)  a substrate.
B)  a product.
C)  energy.
D)  an enzyme.
E)  an enzyme-substrate complex. F) A) and E)
G) A) and D)

Question 13

We often say that we need food for energy.In a biological sense,is this correct?

Accepted Answer

A)  Yes,because the smallest units inside the atoms that make up the food are simply pure energy.
B)  Yes,because the food must move through the digestive system,and motion is kinetic energy.
C)  Yes,because the food we eat has potential energy in its structure and this chemical energy can be converted into mechanical energy.
D)  No,because food consists of matter and cannot be transformed into energy.
E)  No,since all food matter stays matter,and energy remains energy.F) A) and D)
G) C) and D)

Question 14

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Accepted Answer

A) True 
 B)False

Question 15

Since enzymes are not used up during a reaction,they do not play any role in the reaction.

Accepted Answer

A) True 
 B)False

Exam 6: Metabolism: Energy and Enzymes

Explain the factors that will cause a protein to become denatured and what will occur structurally to the protein when it is denatured.

Correct Answer
verified
The two factors that will denature a pro...
View Answer

Poisons are often

Correct Answer
verified

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Correct Answer
verified

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Correct Answer
verified

Ultimately,humans get their energy from the sun.

Correct Answer
verified

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Correct Answer
verified

The specificity of an enzyme to a substrate is currently best explained by

Correct Answer
verified

If A $\rightarrow$ B $\rightarrow$ C $\rightarrow$ D $\rightarrow$ E represents a metabolic pathway,then letter E would be

Correct Answer
verified

Which of the following statements is not true concerning enzymatic activity?

Correct Answer
verified

We often say that we need food for energy.In a biological sense,is this correct?

Correct Answer
verified

The reason an increase in substrate concentration will not increase the reaction rate indefinitely is because

Correct Answer
verified

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Correct Answer
verified

Most enzymes are

Correct Answer
verified

Since enzymes are not used up during a reaction,they do not play any role in the reaction.

Correct Answer
verified

Which of the following statements most accurately describes the first law of thermodynamics?

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

Explain the factors that will cause a protein to become denatured and what will occur structurally to the protein when it is denatured.

Correct AnswerverifiedThe two factors that will denature a pro...View AnswerShow Answer

Poisons are often

Correct AnswerverifiedShow Answer

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Correct AnswerverifiedShow Answer

When heat dissipates into the environment,it is no longer usable by the individual who produced it.

Correct AnswerverifiedShow Answer

Ultimately,humans get their energy from the sun.

Correct AnswerverifiedShow Answer

All of the energy that a plant stores in the bonds of glucose are available to an animal to power its muscles.

Correct AnswerverifiedShow Answer

The specificity of an enzyme to a substrate is currently best explained by

Correct AnswerverifiedShow Answer

If A →\rightarrow→ B →\rightarrow→ C →\rightarrow→ D →\rightarrow→ E represents a metabolic pathway,then letter E would be

Correct AnswerverifiedShow Answer

Which of the following statements is not true concerning enzymatic activity?

Correct AnswerverifiedShow Answer

We often say that we need food for energy.In a biological sense,is this correct?

Correct AnswerverifiedShow Answer

The reason an increase in substrate concentration will not increase the reaction rate indefinitely is because

Correct AnswerverifiedShow Answer

When a kinase adds phosphates to an enzyme,it will only activate the enzyme.

Correct AnswerverifiedShow Answer

Most enzymes are

Correct AnswerverifiedShow Answer

Since enzymes are not used up during a reaction,they do not play any role in the reaction.

Correct AnswerverifiedShow Answer

Which of the following statements most accurately describes the first law of thermodynamics?

Correct AnswerverifiedShow Answer

Correct Answer
verified
The two factors that will denature a pro...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If A $\rightarrow$ B $\rightarrow$ C $\rightarrow$ D $\rightarrow$ E represents a metabolic pathway,then letter E would be

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified