Question 1

Less energy is needed to bring about a reaction when an enzyme is present.

Accepted Answer

A) True 
 B)False

Question 2

Which statement most accurately describes the second law of thermodynamics?

Accepted Answer

A)   Energy cannot be changed from one form to another without a loss of usable energy.
B)   One usable form of energy can be completely converted into another usable form.
C)   Energy cannot be created nor destroyed but it can be changed from one form to another.
D)   Energy cannot be created or destroyed.
E)   Energy cannot be transformed.F) D) and E)
G) A) and B)

Question 3

A reaction is only considered an oxidation reaction when oxygen is involved.

Accepted Answer

A) True 
 B)False

Question 4

Chloroplasts and mitochondria are involved in a redox cycle because

Accepted Answer

A)   carbon dioxide is reduced during photosynthesis and carbohydrate is oxidized during cellular respiration.
B)   both use carbon dioxide.
C)   photosynthesis uses energy and cellular respiration releases energy.
D)   both are required to be in all cells.
E)   energy cycles between the two organelles.F) C) and D)
G) B) and C) A

Question 5

Lactose is milk sugar that is broken down by the enzyme lactase.The reason that some people are "lactose intolerant" could be because

Accepted Answer

A)   the enzyme lactase only works in the laboratory, not in the human body.
B)   the pH of the digestive system does not allow lactase to function properly.
C)   the temperature of the digestive system does not allow lactase to function properly.
D)   they drink too much milk and have inactivated the lactase in their digestive system.
E)   they are missing the enzyme lactase in their digestive system.F) B) and E)
G) A) and E)

Question 6

Will the reaction A + B turn into C,"move" forward if the free energy of A and B is 25 units and the free energy of C is 30 units?

Accepted Answer

The answer of Will the reaction A + B turn...

Question 7

During an enzymatic reaction,what happens to the enzyme?

Accepted Answer

A)   It becomes the product.
B)   It becomes the substrate.
C)   It is used up.
D)   The enzyme and the substrate form a permanent complex.
E)   The enzyme and the substrate form a temporary complex.F) A) and C)
G) A) and D)

Question 8

Energy,but NOT chemicals,may cycle through living things.

Accepted Answer

A) True 
 B)False

Question 9

Ultimately,humans get their energy from the sun.

Accepted Answer

A) True 
 B)False

Question 10

If an enzymatic reaction was controlled by feedback inhibition,we would expect it to stop

Accepted Answer

A)   only if the substrate was exhausted.
B)   when the cofactors are exhausted.
C)   when the product changed the pH.
D)   as soon as a critical level of end product builds up.
E)   only if a metabolic poison is added.F) A) and C)
G) A) and E)

Question 11

If A  →\rarr→  B  →\rarr→  C  →\rarr→  D  →\rarr→  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) None of the above
G) B) and C)

Question 12

ATP contains

Accepted Answer

A)   an adenine base and one phosphate group.
B)   an adenine base and two phosphate groups.
C)   an adenine base and three phosphate groups.
D)   an adenine base, a ribose sugar, and two phosphate groups.
E)   an adenine base, a ribose sugar, and 3 phosphate groups.F) All of the above
G) D) and E)

Question 13

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 14

While science cannot describe "thinking" in physical terms,we are certain that the process involves metabolism inside brain cells.With positron emission tomography (PET scan) ,it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities.However,

Accepted Answer

A)   thought cannot be linked to cell processes because energy is not related to matter.
B)   since thoughts can occur over and over, the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.
C)   the cellular energy expended in thinking must be less than the chemical bond energy supplied in food to these brain cells.
D)   "thinking" is beyond the scope of science to study.
E)   "thinking" is not a cellular process and therefore does not require energy.F) A) and B)
G) B) and D)

Question 15

The place where the substrate fits onto the enzyme is called the

Accepted Answer

A)   active site.
B)   inhibitor site.
C)   receptor site.
D)   enzyme-substrate complex.
E)   enzyme-inhibitor complex.F) C) and D)
G) B) and E)

Question 16

Why are fats a better source of energy than carbohydrates?

Accepted Answer

A)   Fatty acids have a long chain of reduced carbon atoms that will produce large amounts of ATP when their bonds are broken...
B)   Fatty acids have a short chain of reduced carbon atoms that will produce large amounts of ATP when their bonds are broken.
C)   Fatty acids have a long chain of reduced hydrogen atoms that will produce large amounts of ATP when their bonds are broken
D)   Fatty acids have a long chain of reduced carbon atoms that will produce large amounts of ATP when their bonds are broken..
E)   Fatty acids have a long chain of reduced carbon atoms that will produce large amounts of ATP when they form covalent bonds.F) B) and E)
G) A) and E)

Question 17

What is the equation for photosynthesis?

Accepted Answer

A)   C6H12O6 + 6O2  →\rarr→ 6CO2 + 6H2O + energy
B)   Energy + 6CO2 + 6H2O  →\rarr→  C6H12O6 →\rarr→  6CO2 + 6H2O
C)   Energy + C6H12O6  →\rarr→  6CO2 +6H2O
D)   Energy + 6CO2 + 6H2O  →\rarr→  C6H12O6 + 6O2
E)   C6H12O6 + 6CO2  →\rarr→  6O2 + 6H2O + energy F) A) and C)
G) A) and B) D

Question 18

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) B

Question 19

Enzymes are specific.This means that they

Accepted Answer

A)   have a preferred pH.
B)   have a preferred temperature.
C)   have a particular substrate.
D)   are only in certain cells.
E)   require ATP and cofactors in order to work properly.F) A) and B)
G) All of the above

Question 20

A reactant will always produce the same type of product,regardless of the enzymes present.

Accepted Answer

A) True 
 B)False

Exam 6: Metabolism: Energy and Enzymes

Less energy is needed to bring about a reaction when an enzyme is present.

Correct Answer
verified

Which statement most accurately describes the second law of thermodynamics?

Correct Answer
verified

A reaction is only considered an oxidation reaction when oxygen is involved.

Correct Answer
verified

Chloroplasts and mitochondria are involved in a redox cycle because

Correct Answer
verified
A

Lactose is milk sugar that is broken down by the enzyme lactase.The reason that some people are "lactose intolerant" could be because

Correct Answer
verified

Will the reaction A + B turn into C,"move" forward if the free energy of A and B is 25 units and the free energy of C is 30 units?

Correct Answer
verified

During an enzymatic reaction,what happens to the enzyme?

Correct Answer
verified

Energy,but NOT chemicals,may cycle through living things.

Correct Answer
verified

Ultimately,humans get their energy from the sun.

Correct Answer
verified

If an enzymatic reaction was controlled by feedback inhibition,we would expect it to stop

Correct Answer
verified

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

Correct Answer
verified

ATP contains

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

Correct Answer
verified

The place where the substrate fits onto the enzyme is called the

Correct Answer
verified

Why are fats a better source of energy than carbohydrates?

Correct Answer
verified

What is the equation for photosynthesis?

Correct Answer
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D

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

Correct Answer
verified
B

Enzymes are specific.This means that they

Correct Answer
verified

A reactant will always produce the same type of product,regardless of the enzymes present.

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

Less energy is needed to bring about a reaction when an enzyme is present.

Correct AnswerverifiedShow Answer

Which statement most accurately describes the second law of thermodynamics?

Correct AnswerverifiedShow Answer

A reaction is only considered an oxidation reaction when oxygen is involved.

Correct AnswerverifiedShow Answer

Chloroplasts and mitochondria are involved in a redox cycle because

Correct AnswerverifiedA

Lactose is milk sugar that is broken down by the enzyme lactase.The reason that some people are "lactose intolerant" could be because

Correct AnswerverifiedShow Answer

Will the reaction A + B turn into C,"move" forward if the free energy of A and B is 25 units and the free energy of C is 30 units?

Correct AnswerverifiedShow Answer

During an enzymatic reaction,what happens to the enzyme?

Correct AnswerverifiedShow Answer

Energy,but NOT chemicals,may cycle through living things.

Correct AnswerverifiedShow Answer

Ultimately,humans get their energy from the sun.

Correct AnswerverifiedShow Answer

If an enzymatic reaction was controlled by feedback inhibition,we would expect it to stop

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

ATP contains

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

Correct AnswerverifiedShow Answer

The place where the substrate fits onto the enzyme is called the

Correct AnswerverifiedShow Answer

Why are fats a better source of energy than carbohydrates?

Correct AnswerverifiedShow Answer

What is the equation for photosynthesis?

Correct AnswerverifiedD

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

Correct AnswerverifiedB

Enzymes are specific.This means that they

Correct AnswerverifiedShow Answer

A reactant will always produce the same type of product,regardless of the enzymes present.

Correct AnswerverifiedShow Answer

Correct Answer
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A

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

Correct Answer
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D

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B

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