Question 1

Molecules that permeate a plasma membrane by facilitated diffusion:

Accepted Answer

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

Question 2

If you forget to water your favorite plant, all of the following will occur at a cellular level EXCEPT:

Accepted Answer

A) water will move out of the cytosol by osmosis. 
B) water will move out of the vacuole by osmosis. 
C) turgor pressure will build up in the cell. 
D) the plasma membrane will shrink away from the cell wall. 
E) osmosis will occur. 
A) water will move out of the cytosol by osmosis. 
B) water will move out of the vacuole by osmosis. 
C) turgor pressure will build up in the cell. 
D) the plasma membrane will shrink away from the cell wall. 
E) osmosis will occur. C

Question 3

A freshwater protozoan, such as Paramecium, tends to ________ because it lives in a ________ environment.

Accepted Answer

A) gain water; hypotonic 
B) lose water; hypertonic 
C) gain water; hypertonic 
D) lose water; hypotonic 
E) gain water; isotonic 
A) gain water; hypotonic 
B) lose water; hypertonic 
C) gain water; hypertonic 
D) lose water; hypotonic 
E) gain water; isotonic A

Question 4

In reference to diffusion, "passive" really means:

Accepted Answer

A) without a membrane. 
B) in the air. 
C) no gradient. 
D) very slowly. 
E) no energy required. 
A) without a membrane. 
B) in the air. 
C) no gradient. 
D) very slowly. 
E) no energy required.

Question 5

In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

Accepted Answer

A) phospholipids 
B) carbohydrates 
C) proteins 
D) nucleic acids 
E) cytoskeleton 
A) phospholipids 
B) carbohydrates 
C) proteins 
D) nucleic acids 
E) cytoskeleton

Question 6

The cells of the intestinal epithelium (lining)are joined to one another by ________ that prevent substances from passing between the cells of this tissue.

Accepted Answer

The answer of The cells of the intestinal epithelium (lining)are...

Question 7

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 8

Recognition proteins are most important for:

Accepted Answer

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

Question 9

Which process accounts for the movement of solids into some animal cells?

Accepted Answer

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

Question 10

Which of the following would not be found in a membrane?

Accepted Answer

A) cellulose 
B) cholesterol 
C) phospholipid 
D) channel protein 
E) receptor protein 
A) cellulose 
B) cholesterol 
C) phospholipid 
D) channel protein 
E) receptor protein

Question 11

The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the membranes of cells that line the intestine. This toxin prevents the movement of positively charged sodium ions out of the intestine and into these cells. If the sodium ions could not move into the cells, how would this affect the movement of water?

Accepted Answer

A) Water would leave the intestines and enter the cells by diffusion. 
B) Water would leave the intestines and enter the cells by osmosis. 
C) Water would leave the cells and enter the intestines by diffusion. 
D) Water would leave the cells and enter the intestines by osmosis. 
E) The movement of water would not be affected. 
A) Water would leave the intestines and enter the cells by diffusion. 
B) Water would leave the intestines and enter the cells by osmosis. 
C) Water would leave the cells and enter the intestines by diffusion. 
D) Water would leave the cells and enter the intestines by osmosis. 
E) The movement of water would not be affected.

Question 12

If a frog egg cell is placed into a hypotonic solution, it will:

Accepted Answer

A) shrivel via osmosis. 
B) swell via osmosis. 
C) shrivel via facilitated diffusion. 
D) swell via facilitated diffusion. 
E) shrivel via active transport. 
A) shrivel via osmosis. 
B) swell via osmosis. 
C) shrivel via facilitated diffusion. 
D) swell via facilitated diffusion. 
E) shrivel via active transport.

Question 13

Plasma membranes are BEST described as a:

Accepted Answer

A) double layer of phospholipids with hydrophobic tails directed toward the cytoplasm of the cell. 
B) single layer of phospholipids with water molecules attached along one side. 
C) double layer of phospholipids with hydrophilic heads directed toward one another. 
D) double layer of phospholipids with hydrophobic tails oriented toward one another. 
E) single layer of phospholipids with tails pointed toward the inside of the cell. 
A) double layer of phospholipids with hydrophobic tails directed toward the cytoplasm of the cell. 
B) single layer of phospholipids with water molecules attached along one side. 
C) double layer of phospholipids with hydrophilic heads directed toward one another. 
D) double layer of phospholipids with hydrophobic tails oriented toward one another. 
E) single layer of phospholipids with tails pointed toward the inside of the cell.

Question 14

If the radius of one cell were twice as large as the radius of another cell, how much higher or lower would its surface area-to-volume ratio be?

Accepted Answer

A) two times higher 
B) two times lower 
C) half (lower) 
D) ten times higher 
A) two times higher 
B) two times lower 
C) half (lower) 
D) ten times higher

Question 15

Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2)through the cell membrane?

Accepted Answer

A) simple diffusion through the bilayer 
B) facilitated diffusion through channel proteins 
C) facilitated diffusion through carrier proteins 
D) osmosis through aquaporins 
A) simple diffusion through the bilayer 
B) facilitated diffusion through channel proteins 
C) facilitated diffusion through carrier proteins 
D) osmosis through aquaporins

Question 16

What is active transport?

Accepted Answer

A) diffusion of molecules within a cell 
B) movement of molecules into or out of a cell against a concentration gradient 
C) movement of molecules into or out of a cell down a concentration gradient 
D) movement of molecules into or out of a cell using special proteins and not requiring an expenditure of energy 
E) rapid movement of molecules in a solution 
A) diffusion of molecules within a cell 
B) movement of molecules into or out of a cell against a concentration gradient 
C) movement of molecules into or out of a cell down a concentration gradient 
D) movement of molecules into or out of a cell using special proteins and not requiring an expenditure of energy 
E) rapid movement of molecules in a solution

Question 17

Osmosis is the diffusion of water molecules across selectively water-permeable membranes. True or False?

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) polar heads of the phospholipids 
B) channel proteins 
C) cholesterol 
D) saturated fatty acid tails 
E) unsaturated fatty acid tails 
A) polar heads of the phospholipids 
B) channel proteins 
C) cholesterol 
D) saturated fatty acid tails 
E) unsaturated fatty acid tails

Question 19

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

Accepted Answer

plasmodesm

Question 20

ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order:

Accepted Answer

A) head-tail-head-tail. 
B) tail-head-head-tail. 
C) head-tail-tail-head. 
D) tail-head-tail-head. 
E) head-head-tail-tail. 
A) head-tail-head-tail. 
B) tail-head-head-tail. 
C) head-tail-tail-head. 
D) tail-head-tail-head. 
E) head-head-tail-tail.

Exam 5: Cell Membrane Structure and Function

Molecules that permeate a plasma membrane by facilitated diffusion:

If you forget to water your favorite plant, all of the following will occur at a cellular level EXCEPT:

A freshwater protozoan, such as Paramecium, tends to ________ because it lives in a ________ environment.

In reference to diffusion, "passive" really means:

In general, which of the following is largely responsible for moving substances across the plasma membrane, communicating with other cells, and identifying the cell?

The cells of the intestinal epithelium (lining)are joined to one another by ________ that prevent substances from passing between the cells of this tissue.

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.

Recognition proteins are most important for:

Which process accounts for the movement of solids into some animal cells?

Which of the following would not be found in a membrane?

If a frog egg cell is placed into a hypotonic solution, it will:

Plasma membranes are BEST described as a:

If the radius of one cell were twice as large as the radius of another cell, how much higher or lower would its surface area-to-volume ratio be?

Based on these four illustrations of diffusion, which mode would most likely be used to transport oxidized zinc (which has a charge of +2)through the cell membrane?

What is active transport?

Osmosis is the diffusion of water molecules across selectively water-permeable membranes. True or False?

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

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

ISO membranes are inside-out membrane vesicles used by researchers in membrane studies. As a molecule diffuses into the vesicle, it will encounter the layers of the membrane in the following order:

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

A freshwater protozoan, such as Paramecium, tends to because it lives in a environment.

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