Question 1

Competitive inhibition of enzymes:

Accepted Answer

A)  Occurs when a substance other than the 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 enzymeE) All of the above
F) C) and D)

Question 2

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

Accepted Answer

A)  Calorie
B)  Joule
C)  Kilocalorie
D)  Measure of density
E)  None of these are correctF) A) and E)
G) A) and D)

Question 3

The reactants for photosynthesis are:

Accepted Answer

A)  Water and carbon dioxide
B)  Organic compounds
C)  Glucose and water
D)  Glucose and carbon dioxide
E)  Glucose and sunlightF) C) and D)
G) A) and E)

Question 4

Reduction is the gain of electrons.

Accepted Answer

A) True 
 B)False

Question 5

Oxidation-reduction reactions:

Accepted Answer

A)  Transfer electrons from one molecule to another
B)  Are not used by living cells
C)  Transfer protons from one molecule to another
D)  Reduce the amount of oxygen in the cell
E)  Increase the amount of oxygen in the cellF) C) and D)
G) None of the above

Question 6

What is the dependent variable in figure 4.24?

Accepted Answer

A)  The number of defective copies of the CFTR gene in mice
B)  The number of defective copies of the CFTR gene in humans
C)  The amount of fluid in the intestines
D)  Whether or not the subjects were exposed to cholera toxin
E)  Whether or not the subjects were exposed to Vibrio cholera bacteriaF) A) and E)
G) C) and D)

Question 7

At chemical equilibrium:

Accepted Answer

A)  No reactions are occurring in either direction
B)  There are no more products being formed
C)  There are no more reactants for the cell to utilize
D)  The amount of reactants is equal to the amount of products
E)  Reaction rates are in balanceF) B) and D)
G) A) and D)

Question 8

Oxidation means:

Accepted Answer

A)  The gain of oxygen by a cell
B)  The loss of electrons from a molecule
C)  The loss of oxygen by a cell
D)  The gain of electrons by a moleculeE) B) and D)
F) C) and D)

Question 9

What did the scientists conclude from figure 4.24?

Accepted Answer

A)  The fewer copies of a defective CFTR gene an organism has, the more resistant it is to cholera toxin
B)  The number of defective CFTR genes did not correlate with resistance to cholera toxin
C)  The more cholera toxin an organism was exposed to, the more copies of its CFTR gene that became defective
D)  The more cholera toxin an organism was exposed to, fewer copies of its CFTR gene that became defective
E)  The more copies of a defective CFTR gene an organism has, the more resistant it is to cholera toxinF) C) and D)
G) All of the above

Question 10

Movement of molecules down a concentration gradient is an example of:

Accepted Answer

A)  Potential energy
B)  Oxidation
C)  Reduction
D)  Active transport
E)  Kinetic energyF) All of the above
G) C) and E)

Question 11

The diffusion of water across a selectively permeable (biological) membrane is:

Accepted Answer

A)  Facilitated diffusion
B)  Active transport
C)  A rare occurrence
D)  Osmosis
E)  Always beneficial to a cellF) D) and E)
G) B) and E)

Question 12

If two carriers of the defective CFTR gene have a child,what is the probability that the child will have cystic fibrosis?

Accepted Answer

A)  75%
B)  50%
C)  100%
D)  0%
E)  25%F) D) and E)
G) A) and D)

Question 13

If the environment surrounding a cell has a lower concentration of solute than the cell:

Accepted Answer

A)  The environment is isotonic to the cell
B)  The environment is hypertonic to the cell
C)  The cell will not experience a net gain or loss of water
D)  The environment is hypotonic to the cell
E)  The cell will dieF) A) and E)
G) B) and C) D

Question 14

A reason that some antibiotics harm bacteria but not humans is because humans have many more cells than bacteria.

Accepted Answer

A) True 
 B)False

Question 15

Enzymes speed chemical reactions by:

Accepted Answer

A)  Lowering the amount of reactants that are needed
B)  Maintaining chemical equilibrium
C)  Lowering the energy required to start a chemical reaction
D)  Raising the temperature of the surroundings
E)  Supplying energy to the reaction processF) C) and E)
G) B) and D)

Question 16

Turgor pressure is not:

Accepted Answer

A)  Due to a walled cell being in a hypertonic environment
B)  Necessary to keep plants from wilting
C)  The force of water against the inside of the cell wall
D)  Due to osmosis
E)  Due to a walled cell being in a hypotonic environmentF) B) and D)
G) B) and C) B

Question 17

Why does phenylalanine accumulate in patients with phenylketonuria?

Accepted Answer

A)  They lack an enzyme to break down phenylalanine
B)  They lack an enzyme to produce phenylalanine
C)  They produce too much phenylalanine
D)  They lack an inhibitor of an enzyme to break down phenylalanine
E)  They eat more phenylalanine than most other peopleF) A) and D)
G) A) and E)

Question 18

An enzyme is a lipid that catalyzes chemical reactions.

Accepted Answer

A) True 
 B)False

Question 19

The process of phosphorylation:

Accepted Answer

A)  Releases a phosphate group from one molecule
B)  All are correct
C)  Adds a phosphate group to a molecule
D)  May change the shape of the target molecule
E)  May energize the target moleculeF) A) and D)
G) C) and D) B

Question 20

Beriberi is caused by a deficiency of:

Accepted Answer

A)  Vitamin B1
B)  Niacin
C)  Vitamin C
D)  Minerals
E)  None are correctF) C) and D)
G) A) and B)

Exam 4: The Energy of Life

Competitive inhibition of enzymes:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The reactants for photosynthesis are:

Correct AnswerverifiedShow Answer

Reduction is the gain of electrons.

Correct AnswerverifiedShow Answer

Oxidation-reduction reactions:

Correct AnswerverifiedShow Answer

What is the dependent variable in figure 4.24?

Correct AnswerverifiedShow Answer

At chemical equilibrium:

Correct AnswerverifiedShow Answer

Oxidation means:

Correct AnswerverifiedShow Answer

What did the scientists conclude from figure 4.24?

Correct AnswerverifiedShow Answer

Movement of molecules down a concentration gradient is an example of:

Correct AnswerverifiedShow Answer

The diffusion of water across a selectively permeable (biological) membrane is:

Correct AnswerverifiedShow Answer

If two carriers of the defective CFTR gene have a child,what is the probability that the child will have cystic fibrosis?

Correct AnswerverifiedShow Answer

If the environment surrounding a cell has a lower concentration of solute than the cell:

Correct AnswerverifiedD

A reason that some antibiotics harm bacteria but not humans is because humans have many more cells than bacteria.

Correct AnswerverifiedShow Answer

Enzymes speed chemical reactions by:

Correct AnswerverifiedShow Answer

Turgor pressure is not:

Correct AnswerverifiedB

Why does phenylalanine accumulate in patients with phenylketonuria?

Correct AnswerverifiedShow Answer

An enzyme is a lipid that catalyzes chemical reactions.

Correct AnswerverifiedShow Answer

The process of phosphorylation:

Correct AnswerverifiedB

Beriberi is caused by a deficiency of:

Correct AnswerverifiedShow Answer

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D

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B

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B

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