Question 1

Cystic fibrosis is the result of:

Accepted Answer

A) no sodium channel protein. 
B) no sodium-potassium pump. 
C) an abnormal sodium channel protein. 
D) an abnormal chloride channel protein. 
E) cysts in the lungs. 
A) no sodium channel protein. 
B) no sodium-potassium pump. 
C) an abnormal sodium channel protein. 
D) an abnormal chloride channel protein. 
E) cysts in the lungs.

Question 2

Match between columns
                        Premises: Movement of materials across a cell membrane that does not require energy
Requires the expenditure of energy to move molecules or ions across a cell membrane
Uses transport proteins to assist the movement of materials down a concentration gradient
The movement of molecules down their concentration gradient without the use of a transport protein
Uses a transport vesicle to release materials to the exterior of a cell
Uses a transport vesicle to bring large materials into the cell

Accepted Answer

The Answer of simple diffusion and facilitated diffusion and endocytosis is...

Question 3

The phospholipid bilayer forms spontaneously in water.

Accepted Answer

A) True 
 B)False

Question 4

All of the following processes bring materials into a cell except:

Accepted Answer

A) endocytosis. 
B) receptor-mediated endocytosis. 
C) exocytosis. 
D) phagocytosis. 
A) endocytosis. 
B) receptor-mediated endocytosis. 
C) exocytosis. 
D) phagocytosis.

Question 5

The phospholipids of membranes are:

Accepted Answer

A) hydrophilic molecules. 
B) hydrophobic molecules. 
C) both hydrophilic and hydrophobic molecules. 
D) oils. 
A) hydrophilic molecules. 
B) hydrophobic molecules. 
C) both hydrophilic and hydrophobic molecules. 
D) oils.

Question 6

Water moves freely through a semipermeable membrane.

Accepted Answer

A) True 
 B)False

Question 7

A purpose of the plasma membrane is to:

Accepted Answer

A) form the outer boundary of a cell. 
B) produce proteins. 
C) allow no contact with other cells. 
D) keep harmful substances within the cell. 
E) form ribosomes. 
A) form the outer boundary of a cell. 
B) produce proteins. 
C) allow no contact with other cells. 
D) keep harmful substances within the cell. 
E) form ribosomes.

Question 8

Carbohydrate chains serve as the binding sites for many signaling molecules.

Accepted Answer

A) True 
 B)False

Question 9

In cystic fibrosis,cells cannot pump out enough chloride ions.

Accepted Answer

A) True 
 B)False

Question 10

Insulin and many other hormones are protein molecules.Based on your knowledge of transport processes,you can say that cells that secrete these types of hormones do so through:

Accepted Answer

A) facilitated diffusion. 
B) pinocytosis. 
C) passive diffusion. 
D) receptor-mediated endocytosis. 
E) exocytosis. 
A) facilitated diffusion. 
B) pinocytosis. 
C) passive diffusion. 
D) receptor-mediated endocytosis. 
E) exocytosis.

Question 11

One difference between passive and active transport through a cell membrane is that:

Accepted Answer

A) active transport makes ATP. 
B) active transport requires ATP. 
C) passive transport requires ATP. 
D) passive transport makes ATP. 
A) active transport makes ATP. 
B) active transport requires ATP. 
C) passive transport requires ATP. 
D) passive transport makes ATP.

Question 12

You have isolated a cell that is unable to produce cholesterol for its cell membranes.Which of the following defects is this cell most likely to have?

Accepted Answer

A) The cell membrane will not have the correct fluidity. 
B) The cell will not be able to communicate with other cells. 
C) The cell will be unable to transport nutrients. 
D) The cell will burst as a result of osmosis. 
E) The cell will not be able to regulate the transportation of substances into and out of the cell. 
A) The cell membrane will not have the correct fluidity. 
B) The cell will not be able to communicate with other cells. 
C) The cell will be unable to transport nutrients. 
D) The cell will burst as a result of osmosis. 
E) The cell will not be able to regulate the transportation of substances into and out of the cell.

Question 13

Facilitated diffusion occurs with the help of:

Accepted Answer

A) recognition proteins. 
B) peripheral proteins. 
C) transport proteins. 
D) communication proteins. 
E) ribosomes. 
A) recognition proteins. 
B) peripheral proteins. 
C) transport proteins. 
D) communication proteins. 
E) ribosomes.

Question 14

The plasma membrane proteins of a cell can be linked to colored marker molecules.In an experiment,you labeled the membrane proteins of one cell with a red marker and the membrane proteins of a second cell with a blue marker.Using your understanding of the fluid-mosaic model,what might you see happen if you connected the plasma membranes of the two cells so that they form one continuous membrane?

Accepted Answer

The plasma membrane is fluid,so the prot

Question 15

Which statement below is true?

Accepted Answer

A) All internal cell membranes are similar in structure to the plasma membrane. 
B) The only internal membrane of a cell that is similar to the plasma membrane is the nuclear membrane. 
C) All internal membranes of a cell are just giant invaginations from the plasma membrane. 
D) Vesicle membranes degrade as they fuse with the plasma membrane during exocytosis. 
A) All internal cell membranes are similar in structure to the plasma membrane. 
B) The only internal membrane of a cell that is similar to the plasma membrane is the nuclear membrane. 
C) All internal membranes of a cell are just giant invaginations from the plasma membrane. 
D) Vesicle membranes degrade as they fuse with the plasma membrane during exocytosis.

Question 16

Phagocytosis is an example of passive transport.

Accepted Answer

A) True 
 B)False

Question 17

Which type of proteins are involved in nutrient transport across the plasma membrane and why?

Accepted Answer

A) integral proteins, because they span the membrane and are able to carry nutrients across the membrane 
B) peripheral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane 
C) integral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane 
D) peripheral proteins, because they span the membrane and are able to carry nutrients across the membrane 
E) receptor proteins, because their carbohydrate chains bind to nutrients and carry them across the membrane 
A) integral proteins, because they span the membrane and are able to carry nutrients across the membrane 
B) peripheral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane 
C) integral proteins, because they are smaller and can travel across the membrane, thereby carrying nutrients across the membrane 
D) peripheral proteins, because they span the membrane and are able to carry nutrients across the membrane 
E) receptor proteins, because their carbohydrate chains bind to nutrients and carry them across the membrane

Question 18

Facilitated diffusion is similar to simple diffusion because:

Accepted Answer

A) each requires the use of energy. 
B) each requires a protein channel for movement to occur. 
C) in both, materials move down their concentration gradient. 
D) each utilizes vesicles to move material around the cell. 
A) each requires the use of energy. 
B) each requires a protein channel for movement to occur. 
C) in both, materials move down their concentration gradient. 
D) each utilizes vesicles to move material around the cell.

Question 19

Refer to the figure below, and then answer the question that follows.
  
-For this type of transport to take place,which of the following must be true about the interior and exterior environments?

Accepted Answer

A) The amount of glucose outside the cell must be less than the interior concentration. 
B) The glucose concentration must be higher outside the cell than inside the cell. 
C) The glucose concentrations on both sides of the cell must be the same. 
D) A transport protein is involved, so it doesn't matter what the concentrations of glucose are on either side of the membrane. 
A) The amount of glucose outside the cell must be less than the interior concentration. 
B) The glucose concentration must be higher outside the cell than inside the cell. 
C) The glucose concentrations on both sides of the cell must be the same. 
D) A transport protein is involved, so it doesn't matter what the concentrations of glucose are on either side of the membrane.

Question 20

Peripheral proteins:

Accepted Answer

A) usually span the entire membrane. 
B) have no known functions in membranes. 
C) act as channels through which materials can pass. 
D) are defective in cystic fibrosis. 
E) usually attach to integral proteins. 
A) usually span the entire membrane. 
B) have no known functions in membranes. 
C) act as channels through which materials can pass. 
D) are defective in cystic fibrosis. 
E) usually attach to integral proteins.

Exam 5: Lifes Border: the Plasma Membrane

Cystic fibrosis is the result of:

The phospholipid bilayer forms spontaneously in water.

All of the following processes bring materials into a cell except:

The phospholipids of membranes are:

Water moves freely through a semipermeable membrane.

A purpose of the plasma membrane is to:

Carbohydrate chains serve as the binding sites for many signaling molecules.

In cystic fibrosis,cells cannot pump out enough chloride ions.

Insulin and many other hormones are protein molecules.Based on your knowledge of transport processes,you can say that cells that secrete these types of hormones do so through:

One difference between passive and active transport through a cell membrane is that:

You have isolated a cell that is unable to produce cholesterol for its cell membranes.Which of the following defects is this cell most likely to have?

Facilitated diffusion occurs with the help of:

Which statement below is true?

Phagocytosis is an example of passive transport.

Which type of proteins are involved in nutrient transport across the plasma membrane and why?

Facilitated diffusion is similar to simple diffusion because:

Refer to the figure below, and then answer the question that follows. -For this type of transport to take place,which of the following must be true about the interior and exterior environments?

Peripheral proteins:

Science As a Way of Learning: a Guide to the Natural World

Fundamental Building Blocks: Chemistry, water, and Ph

Lifes Components: Biological Molecules

Lifes Home: the Cell

Lifes Mainspring: an Introduction to Energy

Vital Harvest: Deriving Energy From Food

The Green Worlds Gift: Photosynthesis

The Links in Lifes Chain: Genetics and Cell Division

Preparing for Sexual Reproduction: Meiosis

The First Geneticist: Mendel and His Discoveries

Units of Heredity: Chromosomes and Inheritance

Passing on Lifes Information: Dna Structure and Replication

How Proteins Are Made: Genetic Transcription, translation, and Regulation

The Future Isnt What It Used to Be: Biotechnology

An Introduction to Evolution: Charles Darwin, evolutionary Thought, and the Evidence for Evolution

The Means of Evolution: Microevolution

The Outcomes of Evolution: Macroevolution

A Slow Unfolding: the History of Life on Earth

Arriving Late,traveling Far: the Evolution of Human Beings

Viruses,bacteria,archaea,and Protists: the Diversity of Life 1

Fungi: the Diversity of Life 2

Animals: the Diversity of Life 3

Plants: the Diversity of Life 4

The Angiosperms: Form and Function in Flowering Plants

Body Support and Movement: the Integumentary, skeletal, and Muscular Systems

Communication and Control 1: the Nervous System

Communication and Control 2: the Endocrine System

Defending the Body: the Immune System

Transport and Exchange 1: Blood and Breath

Transport and Exchange 2: Digestion, nutrition, and Elimination

An Amazingly Detailed Script: Animal Development

How the Baby Came to Be: Human Reproduction

An Interactive Living World 1: Populations in Ecology

An Interactive Living World 2: Communities in Ecology

An Interactive Living World 3: Ecosystems and Biomes

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