Question 1

Each protein in an electron transport chain is sequentially oxidized,then reduced,allowing the work of actively transporting oxygen molecules by active membrane transport.

Accepted Answer

A) True 
 B)False

Question 2

Enzymes speed chemical reactions by

Accepted Answer

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

Question 3

A raw peanut having almost 2 Calories of energy has 2,000 times the energy to raise the temperature of 1 gram water by 1 °C.

Accepted Answer

A) True 
 B)False

Question 4

Figuer: 
-What did the researchers conclude from the data shown in this figure?

Accepted Answer

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

Question 5

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

Accepted Answer

A)   osmosis.
B)   active transport.
C)   always beneficial to a cell.
D)   a rare occurrence.
E)   a process that always requires proteins.F) B) and D)
G) None of the above

Question 6

Reduction is the gain of electrons by an atom or molecule.

Accepted Answer

A) True 
 B)False

Question 7

Coupled reactions are reactions in which a

Accepted Answer

A)   exergonic reaction drives an endergonic reaction.
B)   exergonic reaction drives a spontaneous reaction.
C)   endergonic reaction drives an exergonic reaction.
D)   endergonic reaction drives a spontaneous reaction.E) B) and C)
F) A) and D)

Question 8

You are cold.Your body begins a shivering response.You quickly rub your hands together,and the friction produces a small amount of heat.The heat is evidence of increasing entropy.

Accepted Answer

A) True 
 B)False

Question 9

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Accepted Answer

A)   positive feedback.
B)   denaturation.
C)   negative feedback.
D)   equilibrium.
E)   a coenzyme.F) All of the above
G) None of the above

Question 10

An enzyme is

Accepted Answer

A)   always a protein.
B)   an organic molecule that catalyzes a cellular reaction.
C)   not necessary to sustain life in a cell.
D)   used up in a reaction.
E)   All of the answer choices are correct.F) All of the above
G) D) and E)

Question 11

Turgor pressure in plant cells is

Accepted Answer

A)   a result of the walled cell being in a hypotonic environment.
B)   due in part to osmosis.
C)   necessary to keep plants from wilting.
D)   the force of water against the inside of the cell wall.
E)   All of the answer choices are correct.F) A) and D)
G) None of the above

Question 12

Noncompetitive inhibition of enzymes occurs

Accepted Answer

A)   when a cofactor, instead of a reactant, binds to the enzyme active site.
B)   when a substance binds to an enzyme at a site away from the active site.
C)   by blocking the production of an enzyme.
D)   when a substance other than the substrate binds at the active site of an enzyme.E) B) and D)
F) A) and D)

Question 13

An enzyme is a lipid that catalyzes chemical reactions.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is not an example of kinetic energy?

Accepted Answer

A)   sound
B)   light
C)   heat
D)   the energy in chemical bonds
E)   random molecular movementF) A) and C)
G) A) and B)

Question 15

Up to 25% of a cell's ATP is used to run sodium-potassium pumps. Without the resulting sodium and potassium gradients, neurons and muscles cannot fire properly.
-If a person is poisoned with cyanide,they cannot generate ATP,and die within a few minutes.In relation to the sodium-potassium pump,what specific impact would cyanide have on concentrations across the cell membrane?

Accepted Answer

A)   Sodium and potassium concentrations would both be higher inside the cell.
B)   Both sodium and potassium concentrations would become isotonic outside the cell.
C)   Sodium concentration would be higher outside the cell, while potassium concentration would be higher inside the cell.
D)   Sodium and potassium concentrations would both be higher outside the cell.
E)   Both sodium and potassium concentrations would reach equilibrium conditions across the cell membrane.F) D) and E)
G) All of the above

Question 16

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

Accepted Answer

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

Question 17

Simple diffusion

Accepted Answer

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

Question 18

One way to produce a vaccine is to heat a virus or bacteria and then inject the inactive pathogen as a vaccination.How would the heat inactivate a virus?

Accepted Answer

A)   by denaturing proteins
B)   All of the answer choices are correct.
C)   by inhibiting its metabolism
D)   by blocking facilitated diffusion
E)   by destroying the membraneF) A) and D)
G) A) and E)

Exam 4: The Energy of Life

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Correct Answer
verified

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

Correct Answer
verified

Coupled reactions are reactions in which a

Correct Answer
verified

Correct Answer
verified

One way to produce a vaccine is to heat a virus or bacteria and then inject the inactive pathogen as a vaccination.How would the heat inactivate a virus?

Correct Answer
verified

Figuer: -What did the researchers conclude from the data shown in this figure?

Correct Answer
verified

You are cold.Your body begins a shivering response.You quickly rub your hands together,and the friction produces a small amount of heat.The heat is evidence of increasing entropy.

Correct Answer
verified

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

Correct Answer
verified

Enzymes speed chemical reactions by

Correct Answer
verified

A raw peanut having almost 2 Calories of energy has 2,000 times the energy to raise the temperature of 1 gram water by 1 °C.

Correct Answer
verified

Which of the following is not an example of kinetic energy?

Correct Answer
verified

Reduction is the gain of electrons by an atom or molecule.

Correct Answer
verified

Noncompetitive inhibition of enzymes occurs

Correct Answer
verified

Simple diffusion

Correct Answer
verified

Each protein in an electron transport chain is sequentially oxidized,then reduced,allowing the work of actively transporting oxygen molecules by active membrane transport.

Correct Answer
verified

An enzyme is

Correct Answer
verified

An enzyme is a lipid that catalyzes chemical reactions.

Correct Answer
verified

Turgor pressure in plant cells is

Correct Answer
verified

Exam 4: The Energy of Life

Your liver produces 90% of the cholesterol found in your body.When cholesterol levels get too high,the first enzyme in the pathway of cholesterol synthesis is inhibited.This is an example of

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Coupled reactions are reactions in which a

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

One way to produce a vaccine is to heat a virus or bacteria and then inject the inactive pathogen as a vaccination.How would the heat inactivate a virus?

Correct AnswerverifiedShow Answer

Figuer: -What did the researchers conclude from the data shown in this figure?

Correct AnswerverifiedShow Answer

You are cold.Your body begins a shivering response.You quickly rub your hands together,and the friction produces a small amount of heat.The heat is evidence of increasing entropy.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enzymes speed chemical reactions by

Correct AnswerverifiedShow Answer

A raw peanut having almost 2 Calories of energy has 2,000 times the energy to raise the temperature of 1 gram water by 1 °C.

Correct AnswerverifiedShow Answer

Which of the following is not an example of kinetic energy?

Correct AnswerverifiedShow Answer

Reduction is the gain of electrons by an atom or molecule.

Correct AnswerverifiedShow Answer

Noncompetitive inhibition of enzymes occurs

Correct AnswerverifiedShow Answer

Simple diffusion

Correct AnswerverifiedShow Answer

Each protein in an electron transport chain is sequentially oxidized,then reduced,allowing the work of actively transporting oxygen molecules by active membrane transport.

Correct AnswerverifiedShow Answer

An enzyme is

Correct AnswerverifiedShow Answer

An enzyme is a lipid that catalyzes chemical reactions.

Correct AnswerverifiedShow Answer

Turgor pressure in plant cells is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified