Question 1

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

Question 2

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) B) and E)
G) B) and D)

Question 3

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

Question 4

Which of the following molecules is NOT an enzyme?

Accepted Answer

A)  lipase
B)  maltase
C)  urease
D)  lactose
E)  ribonucleaseF) B) and C)
G) A) and E)

Question 5

Enzymes maintain their same shape when they bind to a substrate.

Accepted Answer

A) True 
 B)False

Question 6

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) C) and D)
G) A) and D)

Question 7

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) A) and D)
G) A) and C)

Question 8

Which hypothesis,based on the two laws of thermodynamics as applied to cells,would determine if something is a living cell or not?

Accepted Answer

A)  If something uses energy to make itself more organized,then it is alive.
B)  If something is organized,then it is alive.
C)  If something moves,then it is alive.
D)  If something loses heat,then it is alive.
E)  If something uses energy to move,then it is alive.F) A) and B)
G) A) and C)

Question 9

The location in which the enzyme and substrate complexes is called the

Accepted Answer

A)  active site.
B)  inhibitor site.
C)  receptor site.
D)  enzyme-substrate complex.
E)  enzyme-inhibitor complex.F) None of the above
G) B) and D)

Question 10

What is the equation for photosynthesis?

Accepted Answer

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

Question 11

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 break down the chemicals that interrupt their digestive enzymes.F) All of the above
G) A) and C)

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

Which of the following statements is true about enzymes?

Accepted Answer

A)  Their 3D 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) C) and D)
G) C) and E)

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

The main reason that ATP is considered the energy currency in cells is because it

Accepted Answer

A)  is a small molecule.
B)  carries a positive charge.
C)  contains accessible energy in phosphate bonds.
D)  contains an adenine base.
E)  contains a sugar ring.F) A) and E)
G) A) and D)

Question 16

If there are 12 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 12 stages to the end product.
B)  are about 12 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 12 different raw materials combined in the cell by one enzyme.F) B) and C)
G) B) and D)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

The change in free energy of a reaction,delta G,is calculated by

Accepted Answer

A)  subtracting the free energy content of the products from that of the reactants.
B)  subtracting the free energy content of the reactants from that of the products.
C)  adding the free energy content of the products to that of the reactants.
D)  the amount of free energy content of the reactants.
E)  the amount of free energy content of the products.F) B) and E)
G) A) and B)

Question 19

Chemical reactions that require the input of energy are

Accepted Answer

A)  exergonic reactions.
B)  endergonic reactions.
C)  coupled reactions.
D)  kinetic reactions.
E)  catabolic reactions.F) All of the above
G) A) and D)

Question 20

In a coupled reaction,some of the 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

Exam 6: Metabolism: Energy and Enzymes

Which of the following molecules is NOT an enzyme?

Correct AnswerverifiedShow Answer

Which is NOT a correct attribute of a metabolic pathway?

Correct AnswerverifiedShow Answer

What is the equation for photosynthesis?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

If there are 12 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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enzymes are specific.This means that they

Correct AnswerverifiedShow Answer

Chemical reactions that require the input of energy are

Correct AnswerverifiedShow Answer

Which of the following statements is true about enzymes?

Correct AnswerverifiedShow Answer

The location in which the enzyme and substrate complexes is called the

Correct AnswerverifiedShow Answer

The change in free energy of a reaction,delta G,is calculated by

Correct AnswerverifiedShow Answer

ATP can be broken down into

Correct AnswerverifiedShow Answer

Enzymes maintain their same shape when they bind to a substrate.

Correct AnswerverifiedShow Answer

The main reason that ATP is considered the energy currency in cells is because it

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which hypothesis,based on the two laws of thermodynamics as applied to cells,would determine if something is a living cell or not?

Correct AnswerverifiedShow Answer

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