Question 1

Energy sometimes appears spontaneously in living systems.

Accepted Answer

A) True 
 B)False

Question 2

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) B) and D)
G) A) and B)

Question 3

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) D) and E)
G) A) and E) A

Question 4

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

Question 5

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) D) and E)

Question 6

Reduction is the gain of electrons.

Accepted Answer

A) True 
 B)False

Question 7

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 8

The energy source that powers photosynthesis is

Accepted Answer

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

Question 9

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

Question 10

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) All of the above
G) A) and E)

Question 11

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

Question 12

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 D)
G) C) and D)

Question 13

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 14

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

Question 15

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

Question 16

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

Question 17

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) B) and D)
G) C) and D) C

Question 18

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) B) and C)
G) C) and D)

Question 19

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) All of the above
G) A) and B)

Question 20

Reactions that take up energy proceed spontaneously.

Accepted Answer

A) True 
 B)False

Exam 4: The Energy of Life

Energy sometimes appears spontaneously in living systems.

Correct AnswerverifiedShow Answer

The two data curves on the figure illustrate that

Correct AnswerverifiedShow Answer

The region of an enzyme that catalyzes reactions is called

Correct AnswerverifiedA

Simple diffusion

Correct AnswerverifiedShow Answer

Enzymes speed chemical reactions by

Correct AnswerverifiedShow Answer

Reduction is the gain of electrons.

Correct AnswerverifiedShow Answer

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

The energy source that powers photosynthesis is

Correct AnswerverifiedShow Answer

Salted and pickled foods can last unrefridgerated for many years because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

By eating a gazelle,a lion gains

Correct AnswerverifiedShow Answer

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

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

Enzymes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

Oxidation means

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

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

Correct AnswerverifiedShow Answer

Competitive inhibition of enzymes

Correct AnswerverifiedShow Answer

Reactions that take up energy proceed spontaneously.

Correct AnswerverifiedShow Answer

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