Question 1

Which of the following statements is true about enzymes?

Accepted Answer

A)   Their 3-D shape can vary and still be active.
B)   Boiling temperatures do not affect their activity.
C)   They catalyze only one specific type of reaction.
D)   They can associate with a wide variety of substrates.
E)   They are unaffected by changes in pH.F) None of the above
G) A) and B)

Question 2

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 D)
G) None of the above

Question 3

The addition of an enzyme will change the end result of a reaction. In other words, a particular reaction will result in a different product if an enzyme is used.

Accepted Answer

A) True 
 B)False

Question 4

If A has a free energy of 38 units, and C has a free energy of 45 units, and the reaction is exergonic, based on the calculation of free energy, which is the substrate and which is the product?

Accepted Answer

A)   A is the substrate and C is the product.
B)   C is the substrate and A is the product.
C)   It is impossible to tell with this information.
D)   Both A and C are the products.
E)   Both A and C are the substrates.F) A) and C)
G) C) and D)

Question 5

During cellular respiration, what is reduced?

Accepted Answer

A)   glucose
B)   oxygen
C)   carbon dioxide
D)   water
E)   ATP (energy) F) A) and E)
G) A) and B)

Question 6

Because the inside of a cell is more organized than the outside, the inside of the cell has increased entropy.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is an example of chemical work within a cell?

Accepted Answer

A)   diffusion of oxygen across the membrane
B)   building a protein
C)   moving glucose across the cell membrane
D)   the beating of cilia
E)   the contraction of muscle fibersF) A) and B)
G) B) and C)

Question 8

Which of the following is consistent with the laws of physics governing energy?

Accepted Answer

A)   Eventually, sunlight that is absorbed on the earth returns to the atmosphere as dispersed heat.
B)   You eat a "quarter-pounder" hamburger and add exactly a quarter-pound of additional weight to your body.
C)   When a liter of gasoline is burned in a car engine, 100% of its energy goes into moving the car along the road.
D)   A calorie of sunlight becomes a calorie of plant tissue.
E)   A calorie of plant tissue, which when eaten by you, becomes a calorie of muscle "power."F) A) and D)
G) D) and E)

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Glucose is broken down during cellular respiration so that the released energy can be stored and converted into ATP.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

If A → B → C → D → E represents a metabolic pathway, then the 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

Enzymes have "specificity." 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) B) and E)
G) A) and D)

Question 14

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

Accepted Answer

A) True 
 B)False

Exam 6: Metabolism: Energy and Enzymes

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

Correct Answer
verified

Which of the following is an example of chemical work within a cell?

Correct Answer
verified

Which of the following statements is true about enzymes?

Correct Answer
verified

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

Correct Answer
verified

Which of the following is consistent with the laws of physics governing energy?

Correct Answer
verified

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

Correct Answer
verified

If A has a free energy of 38 units, and C has a free energy of 45 units, and the reaction is exergonic, based on the calculation of free energy, which is the substrate and which is the product?

Correct Answer
verified

Enzymes have "specificity." This means that they

Correct Answer
verified

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

Correct Answer
verified

The addition of an enzyme will change the end result of a reaction. In other words, a particular reaction will result in a different product if an enzyme is used.

Correct Answer
verified

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

Correct Answer
verified

Glucose is broken down during cellular respiration so that the released energy can be stored and converted into ATP.

Correct Answer
verified

Because the inside of a cell is more organized than the outside, the inside of the cell has increased entropy.

Correct Answer
verified

During cellular respiration, what is reduced?

Correct Answer
verified

Exam 6: Metabolism: Energy and Enzymes

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

Correct AnswerverifiedShow Answer

Which of the following is an example of chemical work within a cell?

Correct AnswerverifiedShow Answer

Which of the following statements is true about enzymes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is consistent with the laws of physics governing energy?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If A has a free energy of 38 units, and C has a free energy of 45 units, and the reaction is exergonic, based on the calculation of free energy, which is the substrate and which is the product?

Correct AnswerverifiedShow Answer

Enzymes have "specificity." This means that they

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The addition of an enzyme will change the end result of a reaction. In other words, a particular reaction will result in a different product if an enzyme is used.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Glucose is broken down during cellular respiration so that the released energy can be stored and converted into ATP.

Correct AnswerverifiedShow Answer

Because the inside of a cell is more organized than the outside, the inside of the cell has increased entropy.

Correct AnswerverifiedShow Answer

During cellular respiration, what is reduced?

Correct AnswerverifiedShow Answer

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