Question 1

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Accepted Answer

A)  cell A
B)  cell B
C)  cell C
D)  cell DE) A) and B)
F) A) and C)

Question 2

A major function of glycoproteins and glycolipids in the cell membrane is to

Accepted Answer

A)  glue cells together to form tissues.
B)  help the cell retain its shape.
C)  allow the cells of an embryo to sort themselves into tissues and organs.
D)  attach the cell membrane to the cytoskeleton.E) A) and D)
F) A) and C)

Question 3

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment

Accepted Answer

A)  contains a higher concentration of solutes than the protozoan.
B)  is isotonic to the protozoan.
C)  is hypotonic to the protozoan.
D)  is hypertonic to the protozoan.E) All of the above
F) B) and C)

Question 4

In the lab,you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water.The solution in the balloon is relative to the solution in the beaker.

Accepted Answer

A)  hydrophilic
B)  hypotonic
C)  hypertonic
D)  isotonicE) A) and B)
F) B) and C)

Question 5

The transfer of a phosphate group to a molecule or compound is called

Accepted Answer

A)  carboxylation.
B)  hydrogenation.
C)  ionization.
D)  phosphorylation.E) B) and C)
F) A) and B)

Question 6

Which of the following examples is classified as a metabolic pathway?

Accepted Answer

A)  osmosis
B)  passive diffusion
C)  protein synthesis
D)  cell lysisE) C) and D)
F) All of the above

Question 7

An energy barrier

Accepted Answer

A)  is the amount of energy that must be produced by the reactants to end a chemical reaction.
B)  prevents the spontaneous breakdown of molecules in the cell.
C)  is higher than the activation energy of a reaction.
D)  can only be overcome with the use of enzymes.E) B) and D)
F) None of the above

Question 8

The cholesterol associated with animal cell membranes

Accepted Answer

A)  is attached to membrane proteins and extends into the watery environment surrounding the cell.
B)  is an abnormality resulting from a diet high in cholesterol.
C)  helps solidify the membranes when the room temperature is below freezing.
D)  helps to stabilize the cell membrane at body temperature.E) B) and C)
F) None of the above

Question 9

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

Accepted Answer

A)  pinocytosis
B)  diffusion
C)  endocytosis
D)  exocytosisE) A) and D)
F) B) and C)

Question 10

Oxygen crosses a plasma membrane by

Accepted Answer

A)  passive transport.
B)  active transport.
C)  pinocytosis.
D)  osmosis.E) A) and C)
F) B) and D)

Question 11

The energy required to initiate an exergonic reaction is called

Accepted Answer

A)  input energy.
B)  the activation energy.
C)  exergonic energy.
D)  endergonic energy.E) None of the above
F) All of the above

Question 12

Which of the following statements about the ATP molecule is true?

Accepted Answer

A)  It contains five phosphate groups.
B)  It releases energy when one phosphate group leaves ATP.
C)  Extremely stable bonds link the second and third phosphate groups.
D)  It contains the sugar glucose.E) None of the above
F) B) and C)

Question 13

Which of the following processes is endergonic?

Accepted Answer

A)  the synthesis of glucose from carbon dioxide and water
B)  cellular respiration
C)  the burning of wood
D)  the breakdown of glucoseE) None of the above
F) A) and B)

Question 14

Which part of the ATP molecule breaks free of the rest when an ATP molecule is used for energy?

Accepted Answer

A)  part A
B)  part B
C)  part C
D)  part DE) B) and D)
F) A) and D)

Question 15

A plant cell in a hypotonic solution

Accepted Answer

A)  becomes turgid because of an inflow of water.
B)  bursts because of an inflow of water.
C)  wilts because of an outflow of water.
D)  shrivels because of an outflow of water.E) A) and B)
F) None of the above

Question 16

Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline.This is an example of

Accepted Answer

A)  irreversible inhibition.
B)  competitive inhibition.
C)  noncompetitive inhibition.
D)  feedback inhibition.E) A) and B)
F) None of the above

Question 17

When an enzyme catalyzes a reaction,

Accepted Answer

A)  it raises the activation energy of the reaction.
B)  it acts as a reactant.
C)  it lowers the activation energy of the reaction.
D)  it is used once and discarded.E) A) and D)
F) B) and C)

Question 18

Which of the following is a coenzyme?

Accepted Answer

A)  iodine
B)  vitamin B6
C)  iron
D)  zincE) B) and C)
F) B) and D)

Question 19

Cells acquire LDLs by

Accepted Answer

A)  receptor- mediated endocytosis.
B)  pinocytosis.
C)  diffusion.
D)  phagocytosis.E) A) and C)
F) B) and D)

Question 20

If placed in tap water,an animal cell will undergo lysis,whereas a plant cell will not.What accounts for this difference?

Accepted Answer

A)  the relative impermeability of the plant cell wall to water
B)  the expulsion of water by the plant cell's central vacuole
C)  the fact that plant cells are isotonic to tap water
D)  the relative inelasticity and strength of the plant cell wallE) B) and C)
F) None of the above

Exam 5: The Working Cell

The transfer of a phosphate group to a molecule or compound is called

Correct Answer
verified

Which of the following is a coenzyme?

Correct Answer
verified

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Correct Answer
verified

When an enzyme catalyzes a reaction,

Correct Answer
verified

The energy required to initiate an exergonic reaction is called

Correct Answer
verified

Which of the following processes is endergonic?

Correct Answer
verified

If placed in tap water,an animal cell will undergo lysis,whereas a plant cell will not.What accounts for this difference?

Correct Answer
verified

Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline.This is an example of

Correct Answer
verified

A plant cell in a hypotonic solution

Correct Answer
verified

Which part of the ATP molecule breaks free of the rest when an ATP molecule is used for energy?

Correct Answer
verified

Cells acquire LDLs by

Correct Answer
verified

A major function of glycoproteins and glycolipids in the cell membrane is to

Correct Answer
verified

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment

Correct Answer
verified

Which of the following statements about the ATP molecule is true?

Correct Answer
verified

Correct Answer
verified

The cholesterol associated with animal cell membranes

Correct Answer
verified

An energy barrier

Correct Answer
verified

Which of the following examples is classified as a metabolic pathway?

Correct Answer
verified

Oxygen crosses a plasma membrane by

Correct Answer
verified

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

Correct Answer
verified

Exam 5: The Working Cell

The transfer of a phosphate group to a molecule or compound is called

Correct AnswerverifiedShow Answer

Which of the following is a coenzyme?

Correct AnswerverifiedShow Answer

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Correct AnswerverifiedShow Answer

When an enzyme catalyzes a reaction,

Correct AnswerverifiedShow Answer

The energy required to initiate an exergonic reaction is called

Correct AnswerverifiedShow Answer

Which of the following processes is endergonic?

Correct AnswerverifiedShow Answer

If placed in tap water,an animal cell will undergo lysis,whereas a plant cell will not.What accounts for this difference?

Correct AnswerverifiedShow Answer

Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline.This is an example of

Correct AnswerverifiedShow Answer

A plant cell in a hypotonic solution

Correct AnswerverifiedShow Answer

Which part of the ATP molecule breaks free of the rest when an ATP molecule is used for energy?

Correct AnswerverifiedShow Answer

Cells acquire LDLs by

Correct AnswerverifiedShow Answer

A major function of glycoproteins and glycolipids in the cell membrane is to

Correct AnswerverifiedShow Answer

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment

Correct AnswerverifiedShow Answer

Which of the following statements about the ATP molecule is true?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The cholesterol associated with animal cell membranes

Correct AnswerverifiedShow Answer

An energy barrier

Correct AnswerverifiedShow Answer

Which of the following examples is classified as a metabolic pathway?

Correct AnswerverifiedShow Answer

Oxygen crosses a plasma membrane by

Correct AnswerverifiedShow Answer

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

Correct AnswerverifiedShow Answer

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