Question 1

Enzymes speed chemical reactions by

Accepted Answer

A)  lowering the amount of reactants that are needed.
B)  maintaining temperature.
C)  lowering the energy required to start a chemical reaction.
D)  raising the temperature of the surroundings.
E)  supplying energy to the reaction process.F) A) and E)
G) B) and D)

Question 2

During low tide,a plant cell will have an advantage over an animal cell because of its

Accepted Answer

A)  cell wall.
B)  plasma membrane.
C)  chloroplasts.
D)  nucleus.
E)  mitochondria.F) B) and D)
G) C) and E) A

Question 3

By eating a gazelle,a lion gains

Accepted Answer

A)  potential energy.
B)  kinetic energy.
C)  entropy.
D)  respiratory capacity.
E)  enzymes for digesting grass.F) B) and E)
G) B) and D)

Question 4

Salted and pickled foods can last unrefridgerated for many years because

Accepted Answer

A)  the extreme salt or pH concentration denatures the proteins,including enzymes.
B)  the concentration gradient of salt or vinegar causes osmosis into the food.
C)  equilibrium with the environment has occured.
D)  the concentration gradient of salt or vinegar causes osmosis out of the fooD.
E)  the concentration gradient of salt or vinegar causes osmosis out of the food and the extreme salt or pH concentration denatures the proteins,including enzymes.F) A) and D)
G) A) and C)

Question 5

Energy sometimes appears spontaneously in living systems.

Accepted Answer

A) True 
 B)False

Question 6

The two data curves on the figure illustrate that

Accepted Answer

A)  temperature ranges are not the same for all enzyme activity.
B)  temperature is not related to enzyme efficiency.
C)  optimal temperature ranges are not the same for all enzymes.
D)  pH is not related to enzyme efficiency.
E)  All answers are correct.F) A) and E)
G) A) and D)

Question 7

Enzymes

Accepted Answer

A)  slow reactions so they occur correctly.
B)  are not necessary to sustain life in a cell.
C)  are not found in living organisms.
D)  are proteins in most cases.
E)  are carbohydrates in most cases.F) A) and B)
G) A) and C)

Question 8

Enzymes speed up reactions by lowering the activation energy of a reaction.This is analogous with

Accepted Answer

A)  reducing the force a ball needs to start rolling down a hill.
B)  increasing the height an apple will fall from a tree.
C)  blocking a flowing river with a dam to stop the flow.
D)  causing a snow storm in the middle of summer when temperatures are hot.
E)  All answers are correct.F) B) and E)
G) A) and D)

Question 9

The vertical drop slightly after the peak of each curve on the figure illustrates

Accepted Answer

A)  that enzymes will not work if temperatures are too hot (or too cold) .
B)  an increased rate of reaction.
C)  a decreased temperature.
D)  that temperatures only affect enzymes up to a specific temperature.
E)  that enzymes are most efficient at cold temperatures.F) All of the above
G) A) and E)

Question 10

The most common way for energy-absorbing reactions to be powered in cells is for them to be coupled with the breakdown of ATP.

Accepted Answer

A) True 
 B)False

Question 11

Oxidation means

Accepted Answer

A)  the gain of oxygen by a cell.
B)  the loss of electrons from an atom or molecule.
C)  the loss of oxygen from a cell.
D)  the gain of electrons by an atom or molecule.
E)  the loss of protons by an atom or moleculE.F) All of the above
G) C) and D)

Question 12

The region of an enzyme that catalyzes reactions is called

Accepted Answer

A)  an active site.
B)  a binding pocket.
C)  a reaction site.
D)  a catalyst site.
E)  an analog.F) A) and E)
G) A) and D) A

Question 13

The energy source that powers photosynthesis is

Accepted Answer

A)  water.
B)  glucose.
C)  carbon dioxide.
D)  sunlight.
E)  oxygen.F) B) and C)
G) A) and D)

Question 14

Reactions that take up energy proceed spontaneously.

Accepted Answer

A) True 
 B)False

Question 15

The amount of energy required to raise the temperature of one gram of water by one degree Celsius is a

Accepted Answer

A)  calorie.
B)  joule.
C)  kilocalorie.
D)  measure of density.
E)  measure of light.F) B) and C)
G) C) and D)

Question 16

Simple diffusion

Accepted Answer

A)  requires energy.
B)  utilizes proteins to move molecules across a membrane.
C)  moves molecules against a concentration gradient.
D)  cannot occur without a membrane present.
E)  does not require energy.F) B) and E)
G) A) and E)

Question 17

A reason that some antibiotics harm bacteria,but not humans,is because the antibiotic inhibits bacterial enzymes that humans do not have.

Accepted Answer

A) True 
 B)False

Question 18

Plants require energy from light to perform photosynthesis in which glucose is formed from carbon dioxide and water.This is an example of

Accepted Answer

A)  a reaction that releases energy.
B)  kinetic energy.
C)  a reaction that takes up energy.
D)  potential energy.
E)  equilibrium.F) A) and B)
G) D) and E) C

Question 19

Reduction is the gain of electrons.

Accepted Answer

A) True 
 B)False

Question 20

Competitive inhibition of enzymes

Accepted Answer

A)  occurs when a substance other than the correct substrate binds at the active site of an enzyme.
B)  occurs when a substance binds to an enzyme at a site away from the active site.
C)  occurs by denaturation of an enzyme.
D)  occurs by blocking the production of an enzyme.
E)  occurs when two enzymes bind together.F) A) and D)
G) A) and B)

Exam 4: The Energy of Life

Enzymes speed chemical reactions by

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During low tide,a plant cell will have an advantage over an animal cell because of its

Correct AnswerverifiedA

By eating a gazelle,a lion gains

Correct AnswerverifiedShow Answer

Salted and pickled foods can last unrefridgerated for many years because

Correct AnswerverifiedShow Answer

Energy sometimes appears spontaneously in living systems.

Correct AnswerverifiedShow Answer

The two data curves on the figure illustrate that

Correct AnswerverifiedShow Answer

Enzymes

Correct AnswerverifiedShow Answer

Enzymes speed up reactions by lowering the activation energy of a reaction.This is analogous with

Correct AnswerverifiedShow Answer

The vertical drop slightly after the peak of each curve on the figure illustrates

Correct AnswerverifiedShow Answer

The most common way for energy-absorbing reactions to be powered in cells is for them to be coupled with the breakdown of ATP.

Correct AnswerverifiedShow Answer

Oxidation means

Correct AnswerverifiedShow Answer

The region of an enzyme that catalyzes reactions is called

Correct AnswerverifiedA

The energy source that powers photosynthesis is

Correct AnswerverifiedShow Answer

Reactions that take up energy proceed spontaneously.

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The amount of energy required to raise the temperature of one gram of water by one degree Celsius is a

Correct AnswerverifiedShow Answer

Simple diffusion

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A reason that some antibiotics harm bacteria,but not humans,is because the antibiotic inhibits bacterial enzymes that humans do not have.

Correct AnswerverifiedShow Answer

Plants require energy from light to perform photosynthesis in which glucose is formed from carbon dioxide and water.This is an example of

Correct AnswerverifiedC

Reduction is the gain of electrons.

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Competitive inhibition of enzymes

Correct AnswerverifiedShow Answer

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A

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