Question 1

Specialized cell junctions include all of the following EXCEPT

Accepted Answer

A)  tight junctions. 
B)  phospholipases. 
C)  gap junctions. 
D)  desmosomes. 
A)  tight junctions. 
B)  phospholipases. 
C)  gap junctions. 
D)  desmosomes.

Question 2

For diffusion to occur, there must be

Accepted Answer

A)  a gradient. 
B)  water. 
C)  ATP. 
D)  a membrane. 
A)  a gradient. 
B)  water. 
C)  ATP. 
D)  a membrane.

Question 3

Osmosis is the diffusion of water molecules across selectively permeable membranes.

Accepted Answer

A) True 
 B)False

Question 4

The process in which white blood cells engulf bacteria is termed

Accepted Answer

A)  pinocytosis. 
B)  recognition. 
C)  reception. 
D)  phagocytosis. 
E)  exocytosis. 
A)  pinocytosis. 
B)  recognition. 
C)  reception. 
D)  phagocytosis. 
E)  exocytosis.

Question 5

What would happen if the plasma membrane were composed solely of phospholipids and no proteins?

Accepted Answer

A)  Immune reactions would not be affected. 
B)  The movement of molecules across the membrane would not be affected. 
C)  All movement of molecules across the membrane would cease. 
D)  Simple diffusion and osmosis would continue to occur. 
E)  Only water would be able to pass through the membrane. 
A)  Immune reactions would not be affected. 
B)  The movement of molecules across the membrane would not be affected. 
C)  All movement of molecules across the membrane would cease. 
D)  Simple diffusion and osmosis would continue to occur. 
E)  Only water would be able to pass through the membrane.

Question 6

To say that a cell is "selectively permeable" means

Accepted Answer

A)  it is permeable to different substances than other cells. 
B)  it has different- sized perforations in the membrane. 
C)  sometimes water passes through, and sometimes it can't. 
D)  only certain molecules can pass through. 
E)  permeability depends on gradient differences. 
A)  it is permeable to different substances than other cells. 
B)  it has different- sized perforations in the membrane. 
C)  sometimes water passes through, and sometimes it can't. 
D)  only certain molecules can pass through. 
E)  permeability depends on gradient differences.

Question 7

Compare and contrast facilitated diffusion and active transport.

Accepted Answer

Both require membrane transport proteins

Question 8

What structure in the membrane causes plasma membranes to resist freezing?

Accepted Answer

A)  Channel proteins 
B)  Nonpolar heads of the phospholipids 
C)  Unsaturated fatty acid tails 
D)  Cholesterol 
E)  Saturated fatty acid tails 
A)  Channel proteins 
B)  Nonpolar heads of the phospholipids 
C)  Unsaturated fatty acid tails 
D)  Cholesterol 
E)  Saturated fatty acid tails

Question 9

Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

Accepted Answer

A)  Recognition proteins 
B)  Receptor proteins 
C)  Connection proteins 
D)  Transport proteins 
E)  Enzymes 
A)  Recognition proteins 
B)  Receptor proteins 
C)  Connection proteins 
D)  Transport proteins 
E)  Enzymes

Question 10

The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K+ ions. How can K+ ions continue to enter the cell?

Accepted Answer

A)  Exocytosis 
B)  Active transport 
C)  Osmosis 
D)  Infusion 
E)  Facilitated diffusion 
A)  Exocytosis 
B)  Active transport 
C)  Osmosis 
D)  Infusion 
E)  Facilitated diffusion

Question 11

Communication between cells occurs via in plant cells and via in animal cells.

Accepted Answer

plasmodesm

Question 12

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 13

Recognition proteins are most important for

Accepted Answer

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

Question 14

What prevents your immune system from attacking your own cells?

Accepted Answer

A)  Inadequate enzymes 
B)  Fever 
C)  Cholesterol 
D)  Receptor proteins 
E)  Recognition proteins 
A)  Inadequate enzymes 
B)  Fever 
C)  Cholesterol 
D)  Receptor proteins 
E)  Recognition proteins

Question 15

Compare and contrast the intercellular junctions that allow communication between plant and animal cells.

Accepted Answer

Gap junctions in animal cells

Question 16

The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result.

Accepted Answer

The plasma membrane will lose its abilit

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

The most common lipids in biological membranes are _.

Accepted Answer

The answer of The most common lipids in biological membranes...

Question 19

Why does the cell perform endocytosis in addition to active and passive transport?

Accepted Answer

Endocytosis is required for th

Question 20

Within the fluid mosaic of a plasma membrane, what is the role of transport and channel proteins?

Accepted Answer

A)  They identify the cell. 
B)  They may set off cellular changes such as cell division or hormone secretion. 
C)  They prevent the passage of amino acids. 
D)  They are cell- surface connection sites. 
E)  They permit ions and water molecules to move through the plasma membrane. 
A)  They identify the cell. 
B)  They may set off cellular changes such as cell division or hormone secretion. 
C)  They prevent the passage of amino acids. 
D)  They are cell- surface connection sites. 
E)  They permit ions and water molecules to move through the plasma membrane.

Exam 5: Cell Membrane Structure and Function

Specialized cell junctions include all of the following EXCEPT

For diffusion to occur, there must be

Osmosis is the diffusion of water molecules across selectively permeable membranes.

The process in which white blood cells engulf bacteria is termed

What would happen if the plasma membrane were composed solely of phospholipids and no proteins?

To say that a cell is "selectively permeable" means

Compare and contrast facilitated diffusion and active transport.

What structure in the membrane causes plasma membranes to resist freezing?

Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

The cytoplasm of a certain cell, such as a neuron, already has a high concentration of K+ ions. How can K+ ions continue to enter the cell?

Communication between cells occurs via in plant cells and via in animal cells.

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

Recognition proteins are most important for

What prevents your immune system from attacking your own cells?

Compare and contrast the intercellular junctions that allow communication between plant and animal cells.

The antibiotic polymyxin B attaches itself to the phospholipids in the phospholipid bilayer and increases the permeability of the membrane. Describe what will occur as a result.

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

The most common lipids in biological membranes are _.

Why does the cell perform endocytosis in addition to active and passive transport?

Within the fluid mosaic of a plasma membrane, what is the role of transport and channel proteins?

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

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