Question 1

Diffusion occurs because of random molecular movement.

Accepted Answer

A) True 
 B)False

Question 2

Plants stay standing upright because of turgor pressure caused by:

Accepted Answer

A) water rushing into the cells, keeping the cells tight. 
B) solutes rushing into the cells, keeping the cells tight. 
C) bones that run through the plant, holding it upright. 
D) cell walls of the plants supporting and keeping the plants standing upright. 
A) water rushing into the cells, keeping the cells tight. 
B) solutes rushing into the cells, keeping the cells tight. 
C) bones that run through the plant, holding it upright. 
D) cell walls of the plants supporting and keeping the plants standing upright.

Question 3

Exocytosis is an example of active transport of a substance into the cell.

Accepted Answer

A) True 
 B)False

Question 4

The phospholipid bilayer forms because fatty-acid tails do not dissolve in water.

Accepted Answer

A) True 
 B)False

Question 5

The term that describes the diffusion of water is:

Accepted Answer

A) simple diffusion. 
B) equilibrium. 
C) facilitated diffusion. 
D) active transport. 
E) osmosis. 
A) simple diffusion. 
B) equilibrium. 
C) facilitated diffusion. 
D) active transport. 
E) osmosis.

Question 6

The huge array of capabilities of the plasma membrane are performed by its:

Accepted Answer

A) carbohydrates. 
B) proteins. 
C) phospholipids. 
D) cholesterol. 
A) carbohydrates. 
B) proteins. 
C) phospholipids. 
D) cholesterol.

Question 7

Phagocytosis is a type of ________ in which a cell engulfs another cell.

Accepted Answer

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

Question 8

The sodium-potassium pump is an example of:

Accepted Answer

A) passive transport. 
B) receptor-mediated endocytosis. 
C) facilitated diffusion. 
D) active transport. 
A) passive transport. 
B) receptor-mediated endocytosis. 
C) facilitated diffusion. 
D) active transport.

Question 9

The hydrophilic heads of phospholipids in the plasma membrane face a water-based environment.

Accepted Answer

A) True 
 B)False

Question 10

Hydrophobic molecules easily pass through the fatty-acid region of the plasma membrane.

Accepted Answer

A) True 
 B)False

Question 11

Which statement about diffusion is correct?

Accepted Answer

A) Diffusion can occur only through a membrane. 
B) Diffusion requires a protein channel. 
C) Diffusion of water cannot occur. 
D) Diffusion causes movement of materials toward equilibrium. 
A) Diffusion can occur only through a membrane. 
B) Diffusion requires a protein channel. 
C) Diffusion of water cannot occur. 
D) Diffusion causes movement of materials toward equilibrium.

Question 12

To move a molecule into a cell against the concentration gradient requires energy.

Accepted Answer

A) True 
 B)False

Question 13

________ is the process that a cell can use to bring very large molecules into the cell.

Accepted Answer

The answer of ________ is the process that a cell...

Question 14

Which of the following is true of the plasma membrane?

Accepted Answer

A) It controls the passage of substances into and out of the cell. 
B) It only allows hydrophilic materials to pass through. 
C) It is a rigid, nonchanging structure. 
D) Its capabilities are primarily determined by carbohydrates in the membrane. 
A) It controls the passage of substances into and out of the cell. 
B) It only allows hydrophilic materials to pass through. 
C) It is a rigid, nonchanging structure. 
D) Its capabilities are primarily determined by carbohydrates in the membrane.

Question 15

If you could add a colored label to one phospholipid in the cell's plasma membrane to observe this molecule,what kind of movement of the molecule would you see?

Accepted Answer

A) The molecule would move rapidly back and forth across the surface of the membrane. 
B) The molecule would be locked in place by its tightly packed neighbors in the plasma membrane. 
C) The molecule would be converted back and forth between a receptor protein and a phospholipid. 
D) The molecule would move back and forth between the membrane and the surrounding watery solution. 
E) The molecule would flip back and forth from one layer of the membrane to the other. 
A) The molecule would move rapidly back and forth across the surface of the membrane. 
B) The molecule would be locked in place by its tightly packed neighbors in the plasma membrane. 
C) The molecule would be converted back and forth between a receptor protein and a phospholipid. 
D) The molecule would move back and forth between the membrane and the surrounding watery solution. 
E) The molecule would flip back and forth from one layer of the membrane to the other.

Question 16

The fatty-acid tails of a phospholipid are:

Accepted Answer

A) hydrophilic. 
B) proteins. 
C) polar. 
D) hydrophobic. 
E) carbohydrates. 
A) hydrophilic. 
B) proteins. 
C) polar. 
D) hydrophobic. 
E) carbohydrates.

Question 17

Oxygen moving through the plasma membrane down its concentration gradient is an example of:

Accepted Answer

A) simple diffusion. 
B) active transport. 
C) facilitated diffusion. 
D) osmosis. 
A) simple diffusion. 
B) active transport. 
C) facilitated diffusion. 
D) osmosis.

Question 18

Refer to the figure below, and then answer the question that follows.
  
-The type of transport shown is an example of:

Accepted Answer

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

Question 19

The chief component of the plasma membrane is the phospholipid bilayer.

Accepted Answer

A) True 
 B)False

Question 20

Short chains of sugars attached to proteins or phospholipids in the cell membrane make up the:

Accepted Answer

A) phospholipid bilayer. 
B) communication proteins. 
C) cholesterol. 
D) glycocalyx. 
A) phospholipid bilayer. 
B) communication proteins. 
C) cholesterol. 
D) glycocalyx.

Exam 5: Lifes Border: the Plasma Membrane

Diffusion occurs because of random molecular movement.

Plants stay standing upright because of turgor pressure caused by:

Exocytosis is an example of active transport of a substance into the cell.

The phospholipid bilayer forms because fatty-acid tails do not dissolve in water.

The term that describes the diffusion of water is:

The huge array of capabilities of the plasma membrane are performed by its:

Phagocytosis is a type of ________ in which a cell engulfs another cell.

The sodium-potassium pump is an example of:

The hydrophilic heads of phospholipids in the plasma membrane face a water-based environment.

Hydrophobic molecules easily pass through the fatty-acid region of the plasma membrane.

Which statement about diffusion is correct?

To move a molecule into a cell against the concentration gradient requires energy.

________ is the process that a cell can use to bring very large molecules into the cell.

Which of the following is true of the plasma membrane?

If you could add a colored label to one phospholipid in the cell's plasma membrane to observe this molecule,what kind of movement of the molecule would you see?

The fatty-acid tails of a phospholipid are:

Oxygen moving through the plasma membrane down its concentration gradient is an example of:

Refer to the figure below, and then answer the question that follows. -The type of transport shown is an example of:

The chief component of the plasma membrane is the phospholipid bilayer.

Short chains of sugars attached to proteins or phospholipids in the cell membrane make up the:

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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