Question 1

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 2

A forest contains vegetation that is in constant battle with the many insect caterpillars that eat the vegetation.Which of the following strategies would not be a driving force in this evolutionary battle?

Accepted Answer

A)   Plants are selected that evolve strong chemicals (plant alkaloids)  that are toxic to the caterpillar and for which the caterpillars lack digestive enzymes.
B)   Caterpillars are selected that evolve new enzymes to digest or detoxify the plant alkaloids.
C)   Plants are selected that evolve chemicals that slow down or inhibit the digestive enzymes in the caterpillars so that ingested leaf material passes through before much nutrition can be gained.
D)   The caterpillars are selected that eat the least leaf material.
E)   Caterpillars are selected that evolve enzymes to breakdown the chemicals that interrupt their digestive enzymes.F) D) and E)
G) A) and B)

Question 3

Heat is not a form of energy.

Accepted Answer

A) True 
 B)False

Question 4

Poisons are often

Accepted Answer

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

Question 5

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) C) and E)
G) A) and B)

Question 6

If there are twelve different intermediate products produced during production of a molecule in a cell,we can expect that there

Accepted Answer

A)   is one enzyme that carries this process through all twelve stages to the end product.
B)   are about twelve enzymes, at least one responsible for each step in the metabolic pathway.
C)   is one enzyme for degradation and another enzyme for synthesis.
D)   there may not be any enzymes involved if this is a natural cell product.
E)   must be twelve different raw materials combined in the cell by one enzyme.F) C) and E)
G) None of the above

Question 7

Most enzymes are

Accepted Answer

A)   lipid molecules.
B)   carbohydrate molecules.
C)   protein molecules.
D)   DNA molecules.
E)   ATP molecules.F) A) and E)
G) B) and D)

Question 8

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) B) and E)

Question 9

Which is NOT a correct attribute of a metabolic pathway?

Accepted Answer

A)   Reactants are the input molecules.
B)   Reactants act as substrates for specific enzymes.
C)   The product of one reaction can become the reactant for the next.
D)   If several metabolic pathways have a molecule in common, one pathway can lead to several others.
E)   A constant supply of new enzymes must be produced to keep the metabolic pathway active.F) None of the above
G) C) and D)

Question 10

The various uses of ATP include all of the following except

Accepted Answer

A)   being a structural component of the cell membrane.
B)   chemical work.
C)   mechanical work.
D)   transport work.
E)   moving substances into a cell.F) A) and B)
G) A) and D)

Question 11

Occasionally someone claims to have built a machine that can run forever,producing as much energy as it consumes.This has always been disproved because it violates

Accepted Answer

A)   the first law of thermodynamics.
B)   the second law of thermodynamics.
C)   entropy.
D)   laws preventing any conversion between types of energy.
E)   coupled reaction equations.F) C) and D)
G) A) and B)

Question 12

Most cells use a tremendous amount of ATP,

Accepted Answer

A)   so our bodies therefore produce and maintain a huge amount of ATP in storage.
B)   but only a little ATP is needed because it is an enzyme and does not participate in a reaction.
C)   but the amount of stored ATP is not great because our body constantly generates ATP from ADP + P.
D)   mainly because ATP is not very efficient as an energy currency.
E)   but only for chemical work; transport and mechanical work must use transport and mechanical molecules.F) C) and E)
G) B) and E)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell,

Accepted Answer

A)   energy has been created.
B)   entropy has increased.
C)   entropy has decreased.
D)   entropy remains the same.
E)   energy has been destroyed.F) B) and C)
G) C) and D)

Question 15

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) C) and D)
G) None of the above

Question 16

The high energy bond in ATP is found in or between

Accepted Answer

A)   the adenine base.
B)   the adenine and the ribose.
C)   the ribose sugar.
D)   the adenine and the phosphates.
E)   the phosphate groups.F) B) and C)
G) D) and E)

Question 17

In a coupled reaction,energy is not released to the environment because the energy from one reaction is used to drive the other reaction forward.

Accepted Answer

A) True 
 B)False

Question 18

ATP can be broken down into

Accepted Answer

A)   ADP.
B)   ADP plus phosphate.
C)   ADP plus phosphate plus energy.
D)   pyruvate.
E)   lactate.F) A) and E)
G) A) and D)

Question 19

Cells are not as efficient in their use of energy as gasoline engines.

Accepted Answer

A) True 
 B)False

Question 20

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 substratesF) A) and B)
G) C) and D)

Exam 6: Metabolism: Energy and Enzymes

Heat is not a form of energy.

Correct AnswerverifiedShow Answer

Cells are not as efficient in their use of energy as gasoline engines.

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When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell,

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Occasionally someone claims to have built a machine that can run forever,producing as much energy as it consumes.This has always been disproved because it violates

Correct AnswerverifiedShow Answer

The high energy bond in ATP is found in or between

Correct AnswerverifiedShow Answer

Which is NOT a correct attribute of a metabolic pathway?

Correct AnswerverifiedShow Answer

Most cells use a tremendous amount of ATP,

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

The various uses of ATP include all of the following except

Correct AnswerverifiedShow Answer

ATP can be broken down into

Correct AnswerverifiedShow Answer

If there are twelve different intermediate products produced during production of a molecule in a cell,we can expect that there

Correct AnswerverifiedShow Answer

A forest contains vegetation that is in constant battle with the many insect caterpillars that eat the vegetation.Which of the following strategies would not be a driving force in this evolutionary battle?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a coupled reaction,energy is not released to the environment because the energy from one reaction is used to drive the other reaction forward.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Most enzymes are

Correct AnswerverifiedShow Answer

Poisons are often

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

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