Question 1

Membrane channels that allow ions to constantly pass through are called:

Accepted Answer

A)  leak channels 
B)  gated channels 
C)  exocytosis 
D)  endocytosis 
E)  leak channels and gated channels 
A)  leak channels 
B)  gated channels 
C)  exocytosis 
D)  endocytosis 
E)  leak channels and gated channels A

Question 2

In humans

Accepted Answer

A)  the diploid number of chromosomes is 46. 
B)  each body cell has 23 chromosomes. 
C)  each body cell has 2 pairs of sex chromosomes. 
D)  a male has two X chromosomes in each body cell. 
E)  each body cell has 46 autosomes. 
A)  the diploid number of chromosomes is 46. 
B)  each body cell has 23 chromosomes. 
C)  each body cell has 2 pairs of sex chromosomes. 
D)  a male has two X chromosomes in each body cell. 
E)  each body cell has 46 autosomes. A

Question 3

The usual means for getting very large molecules, like whole proteins, across the cell membrane is by

Accepted Answer

A)  simple diffusion. 
B)  passive transport. 
C)  facilitated diffusion. 
D)  active transport. 
E)  endocytosis. 
A)  simple diffusion. 
B)  passive transport. 
C)  facilitated diffusion. 
D)  active transport. 
E)  endocytosis. E

Question 4

The process called diffusion

Accepted Answer

A)  is the tendency for solute molecules to move from an area of high concentration to an area of low concentration. 
B)  is the product of random movement of all atoms, molecules, and ions in a solution. 
C)  always produces net movement of materials against the concentration gradient for that material. 
D)  is both the tendency for solute molecules to move from an area of high concentration to an area of low concentration and is the product of random movement of all atoms, molecules, and ions in a solution are correct. 
E)  is both the tendency for solute molecules to move from an area of high concentration to an area of low concentration and always produces net movement of materials against the concentration gradient for that material. 
A)  is the tendency for solute molecules to move from an area of high concentration to an area of low concentration. 
B)  is the product of random movement of all atoms, molecules, and ions in a solution. 
C)  always produces net movement of materials against the concentration gradient for that material. 
D)  is both the tendency for solute molecules to move from an area of high concentration to an area of low concentration and is the product of random movement of all atoms, molecules, and ions in a solution are correct. 
E)  is both the tendency for solute molecules to move from an area of high concentration to an area of low concentration and always produces net movement of materials against the concentration gradient for that material.

Question 5

Our body cells perform several important functions including:

Accepted Answer

A)  cell metabolism and energy use 
B)  reproduction and inheritance 
C)  communication 
D)  synthesis of molecules 
E)  all of these 
A)  cell metabolism and energy use 
B)  reproduction and inheritance 
C)  communication 
D)  synthesis of molecules 
E)  all of these

Question 6

The nucleolus

Accepted Answer

A)  is located in the cytoplasm. 
B)  is the location for production of large and small ribosomal subunits. 
C)  has its own distinct membrane. 
D)  is important for the formation of Golgi apparatus. 
E)  has all of these characteristics. 
A)  is located in the cytoplasm. 
B)  is the location for production of large and small ribosomal subunits. 
C)  has its own distinct membrane. 
D)  is important for the formation of Golgi apparatus. 
E)  has all of these characteristics.

Question 7

A red blood cell placed in distilled water would be expected to

Accepted Answer

A)  swell and lyse. 
B)  shrink and lyse. 
C)  swell and crenate. 
D)  shrink and crenate. 
A)  swell and lyse. 
B)  shrink and lyse. 
C)  swell and crenate. 
D)  shrink and crenate.

Question 8

Endocytosis

Accepted Answer

A)  involves the formation of a vesicle by invagination of the cell membrane. 
B)  involves the movement of materials to the outside of the cell. 
C)  is the opposite of phagocytosis. 
D)  is a kind of passive transport. 
E)  involves the movement of materials to the outside of the cell and is the opposite of phagocytosis. 
A)  involves the formation of a vesicle by invagination of the cell membrane. 
B)  involves the movement of materials to the outside of the cell. 
C)  is the opposite of phagocytosis. 
D)  is a kind of passive transport. 
E)  involves the movement of materials to the outside of the cell and is the opposite of phagocytosis.

Question 9

Which of the following would occur if all cell membranes were no longer selectively permeable?

Accepted Answer

A)  Action potentials would no longer be generated. 
B)  Cells would be isotonic to their environment. 
C)  You would be subject to a higher rate of illness and disease. 
D)  Cells would not be able to get and keep enough glucose to function. 
E)  All of these choices are plausible. 
A)  Action potentials would no longer be generated. 
B)  Cells would be isotonic to their environment. 
C)  You would be subject to a higher rate of illness and disease. 
D)  Cells would not be able to get and keep enough glucose to function. 
E)  All of these choices are plausible.

Question 10

Substances outside the cell membrane are called

Accepted Answer

A)  intracellular substances. 
B)  extracellular substances. 
C)  intercellular substances. 
D)  Both extracellular material and intercellular material are correct names. 
E)  All of these are correct names. 
A)  intracellular substances. 
B)  extracellular substances. 
C)  intercellular substances. 
D)  Both extracellular material and intercellular material are correct names. 
E)  All of these are correct names.

Question 11

Membrane channels that limit the movement of ions across the membrane are called:

Accepted Answer

A)  leak channels 
B)  gated channels 
C)  exocytosis 
D)  endocytosis 
E)  leak channels and gated channels 
A)  leak channels 
B)  gated channels 
C)  exocytosis 
D)  endocytosis 
E)  leak channels and gated channels

Question 12

A dialysis membrane is selectively permeable, and substances smaller than proteins are able to pass through. The dialysis machine allows blood to flow past one side of the dialysis membrane and the dialysis fluid flows on the other side of the membrane. If you wanted to use a dialysis machine to remove only urea (a small molecule) from blood, what could you use for the dialysis fluid?

Accepted Answer

A)  a solution that is isotonic and contains only protein 
B)  a solution that is isotonic and contains the same concentration of substances as blood, except for having no urea in it 
C)  distilled water 
D)  whole blood 
E)  hypertonic salt water 
A)  a solution that is isotonic and contains only protein 
B)  a solution that is isotonic and contains the same concentration of substances as blood, except for having no urea in it 
C)  distilled water 
D)  whole blood 
E)  hypertonic salt water

Question 13

The type of membrane transport that uses carrier molecules to move substances with the concentration gradient for that substance is

Accepted Answer

A)  simple diffusion. 
B)  exocytosis. 
C)  facilitated diffusion. 
D)  active transport. 
E)  endocytosis. 
A)  simple diffusion. 
B)  exocytosis. 
C)  facilitated diffusion. 
D)  active transport. 
E)  endocytosis.

Question 14

Carrier mediated transport mechanisms

Accepted Answer

A)  exhibit specificity. 
B)  function to move large water soluble molecules. 
C)  function to move electrically charged ions. 
D)  include facilitated diffusion, active transport, and secondary active transport. 
E)  All of these are correct. 
A)  exhibit specificity. 
B)  function to move large water soluble molecules. 
C)  function to move electrically charged ions. 
D)  include facilitated diffusion, active transport, and secondary active transport. 
E)  All of these are correct.

Question 15

Which of these cells would most likely have the largest number of mitochondria?

Accepted Answer

A)  bone cells 
B)  muscle cells 
C)  fat cells 
D)  blood cells 
E)  skin cells 
A)  bone cells 
B)  muscle cells 
C)  fat cells 
D)  blood cells 
E)  skin cells

Question 16

In ______________, carrier molecules move a substance against (up) the concentration gradient.

Accepted Answer

A)  simple diffusion 
B)  exocytosis 
C)  facilitated diffusion 
D)  active transport 
E)  endocytosis 
A)  simple diffusion 
B)  exocytosis 
C)  facilitated diffusion 
D)  active transport 
E)  endocytosis

Question 17

Cell shrinkage is also called

Accepted Answer

A)  crenation. 
B)  lysis. 
C)  cellular dissolution. 
D)  hydrostatic pressure. 
E)  All of these are correct. 
A)  crenation. 
B)  lysis. 
C)  cellular dissolution. 
D)  hydrostatic pressure. 
E)  All of these are correct.

Question 18

Translation

Accepted Answer

A)  requires three types of DNA. 
B)  requires the pairing of codons on tRNA with anticodons on mRNA. 
C)  involves copying RNA from DNA molecules. 
D)  involves formation of peptide bonds between adjacent amino acids. 
E)  All of these are true of translation. 
A)  requires three types of DNA. 
B)  requires the pairing of codons on tRNA with anticodons on mRNA. 
C)  involves copying RNA from DNA molecules. 
D)  involves formation of peptide bonds between adjacent amino acids. 
E)  All of these are true of translation.

Question 19

Which of the following statements concerning facilitated diffusion is correct?

Accepted Answer

A)  Facilitated diffusion involves the use of ATP. 
B)  Facilitated diffusion involves carrier molecules in the plasma membrane. 
C)  Facilitated diffusion is used to exchange one substance for another. 
D)  Facilitated diffusion is one specific type of endocytosis. 
E)  Facilitated diffusion occurs during endocytosis. 
A)  Facilitated diffusion involves the use of ATP. 
B)  Facilitated diffusion involves carrier molecules in the plasma membrane. 
C)  Facilitated diffusion is used to exchange one substance for another. 
D)  Facilitated diffusion is one specific type of endocytosis. 
E)  Facilitated diffusion occurs during endocytosis.

Question 20

The nucleic acid that combines with pre-existing protein to form ribosomal subunits is

Accepted Answer

A)  tRNA. 
B)  mRNA. 
C)  rRNA. 
D)  All of these are true. 
A)  tRNA. 
B)  mRNA. 
C)  rRNA. 
D)  All of these are true.

Membrane channels that allow ions to constantly pass through are called:

In humans

The usual means for getting very large molecules, like whole proteins, across the cell membrane is by

The process called diffusion

Our body cells perform several important functions including:

The nucleolus

A red blood cell placed in distilled water would be expected to

Endocytosis

Which of the following would occur if all cell membranes were no longer selectively permeable?

Substances outside the cell membrane are called

Membrane channels that limit the movement of ions across the membrane are called:

The type of membrane transport that uses carrier molecules to move substances with the concentration gradient for that substance is

Carrier mediated transport mechanisms

Which of these cells would most likely have the largest number of mitochondria?

In ______________, carrier molecules move a substance against (up) the concentration gradient.

Cell shrinkage is also called

Translation

Which of the following statements concerning facilitated diffusion is correct?

The nucleic acid that combines with pre-existing protein to form ribosomal subunits is

The Human Organism

The Chemical Basis of Life

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Muscular System

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

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Exam 3: Cell Structures and Their Functions

Membrane channels that allow ions to constantly pass through are called:

In humans

The usual means for getting very large molecules, like whole proteins, across the cell membrane is by

The process called diffusion

Our body cells perform several important functions including:

The nucleolus

A red blood cell placed in distilled water would be expected to

Endocytosis

Which of the following would occur if all cell membranes were no longer selectively permeable?

Substances outside the cell membrane are called

Membrane channels that limit the movement of ions across the membrane are called:

The type of membrane transport that uses carrier molecules to move substances with the concentration gradient for that substance is

Carrier mediated transport mechanisms

Which of these cells would most likely have the largest number of mitochondria?

In ______________, carrier molecules move a substance against (up) the concentration gradient.

Cell shrinkage is also called

Translation

Which of the following statements concerning facilitated diffusion is correct?

The nucleic acid that combines with pre-existing protein to form ribosomal subunits is

The Human Organism

The Chemical Basis of Life

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Muscular System

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

Filters