Question 1

The hydrophilic regions of a membrane protein are most likely to be found

Accepted Answer

A)  only in muscle cell membranes. 
B)  exposed on the surface of the cell membrane. 
C)  attached to carbohydrates and facing the interior of a cell. 
D)  associated with the fatty acid region of the lipids. 
E)  in the interior of the membrane. 
A)  only in muscle cell membranes. 
B)  exposed on the surface of the cell membrane. 
C)  attached to carbohydrates and facing the interior of a cell. 
D)  associated with the fatty acid region of the lipids. 
E)  in the interior of the membrane.

Question 2

Recognition proteins are most important for

Accepted Answer

A)  maintaining membrane integrity. 
B)  facilitated diffusion of molecules. 
C)  active transport of molecules. 
D)  distinguishing foreign cells from ʺselfʺ cells. 
E)  maintaining membrane fluidity. 
A)  maintaining membrane integrity. 
B)  facilitated diffusion of molecules. 
C)  active transport of molecules. 
D)  distinguishing foreign cells from ʺselfʺ cells. 
E)  maintaining membrane fluidity.

Question 3

The substances in cell membranes that form a barrier to the movement of materials across the membrane are

Accepted Answer

A)  nucleic acids. 
B)  external proteins. 
C)  carbohydrates. 
D)  internal proteins. 
E)  lipids. 
A)  nucleic acids. 
B)  external proteins. 
C)  carbohydrates. 
D)  internal proteins. 
E)  lipids.

Question 4

Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?

Accepted Answer

A)  One of the components of the membrane is water. 
B)  The bilayer permits diffusion of certain lipid-soluble substances. 
C)  The membrane is water soluble. 
D)  The plasma membrane is ʺfluidʺ because of the movement of substances across the membrane. 
E)  The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer. 
A)  One of the components of the membrane is water. 
B)  The bilayer permits diffusion of certain lipid-soluble substances. 
C)  The membrane is water soluble. 
D)  The plasma membrane is ʺfluidʺ because of the movement of substances across the membrane. 
E)  The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer.

Question 5

The movement of molecules across a cell membrane via a transport protein in which no energy is required is called__________ diffusion, and the movement of molecules across a cell membrane via a protein in which energy (i.e., ATP) is required is called __________transport.

Accepted Answer

The answer of The movement of molecules across a cell...

Question 6

__________is used by white blood cells to consume large particles such as bacteria.

Accepted Answer

The answer of __________is used by white blood cells to...

Question 7

The hydrophobic tails of a phospholipid bilayer are oriented toward the

Accepted Answer

A)  both the extracellular fluid and cytoplasm. 
B)  interstitial fluid. 
C)  cytoplasm of the cell. 
D)  interior of the plasma membrane (i.e., toward one another). 
E)  extracellular fluid surrounding the cell. 
A)  both the extracellular fluid and cytoplasm. 
B)  interstitial fluid. 
C)  cytoplasm of the cell. 
D)  interior of the plasma membrane (i.e., toward one another). 
E)  extracellular fluid surrounding the cell.

Question 8

Both plant cells and animal cells will swell if placed in a hypotonic solution. However, only the animal cell will burst. Why?

Accepted Answer

Water will enter both cells due to osmos

Question 9

Distinguish among the three types of endocytosis: pinocytosis, receptor-mediated endocytosis, and phagocytosis.

Accepted Answer

Pinocytosis is for fluid intak

Question 10

Osmosis moves water from a region of

Accepted Answer

A)  high solute concentration to a region of low solute concentration. 
B)  negative osmotic potential to a region of positive osmotic potential. 
C)  low solute concentration of to a region of high solute concentration. 
D)  low concentration of water to a region of high concentration of water. 
E)  hypertonic solution to a region of hypotonic solution. 
A)  high solute concentration to a region of low solute concentration. 
B)  negative osmotic potential to a region of positive osmotic potential. 
C)  low solute concentration of to a region of high solute concentration. 
D)  low concentration of water to a region of high concentration of water. 
E)  hypertonic solution to a region of hypotonic solution.

Question 11

Two aqueous solutions are separated by a selectively permeable membrane that allows water to pass through but does not allow starch to pass through. Solution A is 10% starch and solution B is 5% starch. What will occur?

Accepted Answer

A)  Water will diffuse from solution B to solution A. 
B)  Water will diffuse from solution A to solution B. 
C)  Starch will diffuse from solution B to solution A. 
D)  Starch will diffuse from solution A to solution B. 
E)  Both water and starch will diffuse from solution B to solution A. 
A)  Water will diffuse from solution B to solution A. 
B)  Water will diffuse from solution A to solution B. 
C)  Starch will diffuse from solution B to solution A. 
D)  Starch will diffuse from solution A to solution B. 
E)  Both water and starch will diffuse from solution B to solution A.

Question 12

In biological membranes, the phospholipids are arranged in a

Accepted Answer

A)  single layer, with the phosphorus-containing region facing the interior of the cell. 
B)  bilayer, with the fatty acids pointing toward one another. 
C)  bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell). 
D)  bilayer, with the phosphorus groups in the interior of the membrane. 
E)  single layer, with the fatty acids facing the interior of the cell. 
A)  single layer, with the phosphorus-containing region facing the interior of the cell. 
B)  bilayer, with the fatty acids pointing toward one another. 
C)  bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell). 
D)  bilayer, with the phosphorus groups in the interior of the membrane. 
E)  single layer, with the fatty acids facing the interior of the cell.

Question 13

Molecules that permeate a plasma membrane by facilitated diffusion

Accepted Answer

A)  require the aid of transport proteins. 
B)  move from an area of low concentration to an area of high concentration. 
C)  do so much more quickly than those crossing by simple diffusion. 
D)  require energy. 
A)  require the aid of transport proteins. 
B)  move from an area of low concentration to an area of high concentration. 
C)  do so much more quickly than those crossing by simple diffusion. 
D)  require energy.

Question 14

Why is the biological membrane said to be selectively permeable?

Accepted Answer

It allows only some

Question 15

When substances move across a plasma membrane and down concentration gradients, this is called

Accepted Answer

A)  active transport. 
B)  exocytosis. 
C)  passive transport. 
D)  pinocytosis. 
A)  active transport. 
B)  exocytosis. 
C)  passive transport. 
D)  pinocytosis.

Question 16

After a dye diffuses uniformly throughout a glass of water, the dye molecules are no longer moving.

Accepted Answer

A) True 
 B)False

Exam 5: Cell Membrane Structure and Function

The hydrophilic regions of a membrane protein are most likely to be found

Recognition proteins are most important for

The substances in cell membranes that form a barrier to the movement of materials across the membrane are

Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?

The movement of molecules across a cell membrane via a transport protein in which no energy is required is called__________ diffusion, and the movement of molecules across a cell membrane via a protein in which energy (i.e., ATP) is required is called __________transport.

__________is used by white blood cells to consume large particles such as bacteria.

The hydrophobic tails of a phospholipid bilayer are oriented toward the

Both plant cells and animal cells will swell if placed in a hypotonic solution. However, only the animal cell will burst. Why?

Distinguish among the three types of endocytosis: pinocytosis, receptor-mediated endocytosis, and phagocytosis.

Osmosis moves water from a region of

Two aqueous solutions are separated by a selectively permeable membrane that allows water to pass through but does not allow starch to pass through. Solution A is 10% starch and solution B is 5% starch. What will occur?

In biological membranes, the phospholipids are arranged in a

Molecules that permeate a plasma membrane by facilitated diffusion

Why is the biological membrane said to be selectively permeable?

When substances move across a plasma membrane and down concentration gradients, this is called

After a dye diffuses uniformly throughout a glass of water, the dye molecules are no longer moving.

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

DNA: The Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

Filters

The movement of molecules across a cell membrane via a transport protein in which no energy is required is called diffusion, and the movement of molecules across a cell membrane via a protein in which energy (i.e., ATP) is required is called transport.