Question 1

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 2

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

Accepted Answer

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

Question 3

What happens when diffusion moves molecules across the plasma membrane?

Accepted Answer

A) The cell gains needed materials and gets rid of excess materials very quickly. 
B) Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate. 
C) Energy input is required to transport molecules. 
D) The rate of diffusion cannot be influenced by the cell. 
E) The process is relatively slow and is driven by concentration gradients. 
A) The cell gains needed materials and gets rid of excess materials very quickly. 
B) Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate. 
C) Energy input is required to transport molecules. 
D) The rate of diffusion cannot be influenced by the cell. 
E) The process is relatively slow and is driven by concentration gradients.

Question 4

________ is used by cells to consume large particles such as bacteria.

Accepted Answer

The answer of ________ is used by cells to consume...

Question 5

Two similar-sized animal cells are placed in a 0.5% sucrose solution. Cell A enlarges for a while and then stops; cell B continues to enlarge and finally ruptures. Which of the following must have been TRUE at the beginning of the experiment?

Accepted Answer

A) Cell A was hypotonic to the solution, and cell B was hypertonic. 
B) Cell A was hypertonic to the solution, and cell B was hypotonic. 
C) Cell A was hypertonic to cell B. 
D) Cell B was hypertonic to cell A. 
E) Cells A and B were isotonic to each other. 
A) Cell A was hypotonic to the solution, and cell B was hypertonic. 
B) Cell A was hypertonic to the solution, and cell B was hypotonic. 
C) Cell A was hypertonic to cell B. 
D) Cell B was hypertonic to cell A. 
E) Cells A and B were isotonic to each other.

Question 6

In biological membranes, the phospholipids are arranged in a:

Accepted Answer

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

Question 7

Carrier molecules in the plasma membrane are required only for active transport. True or False?

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

How does the cell membrane act as a "gatekeeper" for the cell?

Accepted Answer

It separates the internal and

Question 10

Glucose is a six-carbon sugar that diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Given this information, which transport mechanism is most probably functioning in the intestinal cells?

Accepted Answer

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

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

Question 12

The electrical signal for a muscle to contract passes rapidly from one cell to the next via:

Accepted Answer

A) tight junctions. 
B) desmosomes. 
C) gap junctions. 
D) internal proteins. 
E) external proteins. 
A) tight junctions. 
B) desmosomes. 
C) gap junctions. 
D) internal proteins. 
E) external proteins.

Question 13

Cell membranes do all of the following EXCEPT:

Accepted Answer

A) isolate the cell's contents from the external environment. 
B) communicate with other cells. 
C) regulate the movement of substances between the cell and the extracellular fluid. 
D) provide attachments between cells. 
E) provide shape and structure to a cell. 
A) isolate the cell's contents from the external environment. 
B) communicate with other cells. 
C) regulate the movement of substances between the cell and the extracellular fluid. 
D) provide attachments between cells. 
E) provide shape and structure to a cell.

Question 14

Which of the following types of membrane proteins are responsible for connecting cells to one another?

Accepted Answer

A) transport proteins 
B) recognition proteins 
C) enzymes 
D) receptor proteins 
E) attachment proteins 
A) transport proteins 
B) recognition proteins 
C) enzymes 
D) receptor proteins 
E) attachment proteins

Question 15

You observe a cell under a microscope and you can clearly see a cell wall, a vacuole, and cytoplasmic connections. These cytoplasmic connections must be:

Accepted Answer

A) gap junctions. 
B) desmosomes. 
C) plasmodesmata. 
D) tight junctions. 
E) osmotic channels. 
A) gap junctions. 
B) desmosomes. 
C) plasmodesmata. 
D) tight junctions. 
E) osmotic channels.

Question 16

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

Accepted Answer

A) All movement of molecules across the membrane would cease. 
B) Diffusion and osmosis would continue to occur. 
C) Facilitated diffusion, active transport, and osmosis would not occur. 
D) The movement of molecules across the membrane would not be affected. 
E) Immune reactions would not be affected. 
A) All movement of molecules across the membrane would cease. 
B) Diffusion and osmosis would continue to occur. 
C) Facilitated diffusion, active transport, and osmosis would not occur. 
D) The movement of molecules across the membrane would not be affected. 
E) Immune reactions would not be affected.

Question 17

The secretion of excess water via the contractive vacuole of a Paramecium cell is an example of:

Accepted Answer

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

Question 18

The phospholipid contains two different parts: a ________ head and a pair of ________ tails.

Accepted Answer

polar and/or hydroph

Question 19

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

Accepted Answer

Endocytosis is required for th

Question 20

Cells use exocytosis to:

Accepted Answer

A) move away from danger. 
B) release substances from the cell. 
C) ingest nutrients. 
D) pump hydrogen molecules across the membrane. 
E) create new cells. 
A) move away from danger. 
B) release substances from the cell. 
C) ingest nutrients. 
D) pump hydrogen molecules across the membrane. 
E) create new cells.

Exam 5: Cell Membrane Structure and Function

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

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

What happens when diffusion moves molecules across the plasma membrane?

________ is used by cells to consume large particles such as bacteria.

Two similar-sized animal cells are placed in a 0.5% sucrose solution. Cell A enlarges for a while and then stops; cell B continues to enlarge and finally ruptures. Which of the following must have been TRUE at the beginning of the experiment?

In biological membranes, the phospholipids are arranged in a:

Carrier molecules in the plasma membrane are required only for active transport. True or False?

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

How does the cell membrane act as a "gatekeeper" for the cell?

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?

The electrical signal for a muscle to contract passes rapidly from one cell to the next via:

Cell membranes do all of the following EXCEPT:

Which of the following types of membrane proteins are responsible for connecting cells to one another?

You observe a cell under a microscope and you can clearly see a cell wall, a vacuole, and cytoplasmic connections. These cytoplasmic connections must be:

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

The secretion of excess water via the contractive vacuole of a Paramecium cell is an example of:

The phospholipid contains two different parts: a ________ head and a pair of ________ tails.

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

Cells use exocytosis to:

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

The Continuity of Life: Cellular 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 Amidst 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

How Do Ecosystems Work

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

The phospholipid contains two different parts: a head and a pair of tails.