Question 1

Adhesion of cells within animal tissues is accomplished by cell-to-cell junctions called

Accepted Answer

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

Question 2

Phospholipids contain two different parts: a __________head and a pair of __________tails.

Accepted Answer

polar and/or hydroph

Question 3

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

Accepted Answer

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

Question 4

Molecules assisted by carrier proteins may cross a selectively permeable membrane by

Accepted Answer

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

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 has a higher concentration of sucrose than cell B. 
B)  Cell A was hypertonic to the solution, and cell B was hypotonic. 
C)  Cell B has a higher concentration of sucrose than cell A. 
D)  Cell A was hypotonic to the solution, and cell B was hypertonic. 
E)  Cells A and B were isotonic to each other. 
A)  Cell A has a higher concentration of sucrose than cell B. 
B)  Cell A was hypertonic to the solution, and cell B was hypotonic. 
C)  Cell B has a higher concentration of sucrose than cell A. 
D)  Cell A was hypotonic to the solution, and cell B was hypertonic. 
E)  Cells A and B were isotonic to each other.

Question 6

When very small viruses infect a plant cell by crossing its membrane, the viruses often spread rapidly throughout the entire plant without crossing additional membranes. Explain how this occurs.

Accepted Answer

The viruses travel c

Question 7

Which of the following requires adenosine triphosphate?

Accepted Answer

A)  Active transport 
B)  Simple diffusion 
C)  Facilitated diffusion 
D)  Osmosis 
A)  Active transport 
B)  Simple diffusion 
C)  Facilitated diffusion 
D)  Osmosis

Question 8

Suppose a bag made of a selectively permeable membrane was filled with a 5% solution of glucose and sealed. What would happen if the bag was placed in pure water or in a 10% glucose solution?

Accepted Answer

In pure water, the bag would s

Question 9

All of the following may influence the rate of simple diffusion across a selectively permeable membrane EXCEPT the

Accepted Answer

A)  concentration gradient. 
B)  lipid solubility of the molecule. 
C)  temperature. 
D)  size of the molecule. 
E)  size of the cell. 
A)  concentration gradient. 
B)  lipid solubility of the molecule. 
C)  temperature. 
D)  size of the molecule. 
E)  size of the cell.

Question 10

Compare and contrast osmosis and simple diffusion.

Accepted Answer

Both are passive processes. However, osm

Question 11

What is active transport?

Accepted Answer

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

Question 12

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)  1/2 lower 
B)  2 times lower 
C)  10 times higher 
D)  2 times higher 
A)  1/2 lower 
B)  2 times lower 
C)  10 times higher 
D)  2 times higher

Question 13

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

Question 14

The net movement of molecules from a high concentration to a low concentration is best described by which of the following?

Accepted Answer

A)  Passive transport 
B)  Osmosis 
C)  Endocytosis 
D)  Active transport 
E)  Exocytosis 
A)  Passive transport 
B)  Osmosis 
C)  Endocytosis 
D)  Active transport 
E)  Exocytosis

Question 15

The blood plasma of a man who drinks salt water will become__________ to his red blood cells, whereas the red blood cells will be__________ to the blood plasma.

Accepted Answer

A)  hypotonic; hypertonic 
B)  hypertonic; isotonic 
C)  hypertonic; hypotonic 
D)  isotonic; hypertonic 
E)  isotonic; isotonic 
A)  hypotonic; hypertonic 
B)  hypertonic; isotonic 
C)  hypertonic; hypotonic 
D)  isotonic; hypertonic 
E)  isotonic; isotonic

Question 16

If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?

Accepted Answer

A)  The cells remain unchanged due to equal water concentrations inside and outside the cells. 
B)  The cells swell and burst because water moves into them. 
C)  The cells shrivel up because water leaves them. 
D)  The cells remain unchanged due to equal solute concentrations inside and outside the cells. 
E)  They become white blood cells. 
A)  The cells remain unchanged due to equal water concentrations inside and outside the cells. 
B)  The cells swell and burst because water moves into them. 
C)  The cells shrivel up because water leaves them. 
D)  The cells remain unchanged due to equal solute concentrations inside and outside the cells. 
E)  They become white blood cells.

Question 17

The urinary bladder is protected from leaking by cell-to-cell junctions called

Accepted Answer

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

Question 18

The most common lipids in biological membranes are__________ .

Accepted Answer

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

Question 19

Plasma membranes are best described as a

Accepted Answer

A)  double layer of phospholipids with hydrophobic tails facing toward one another. 
B)  single layer of phospholipids with water molecules attached along one side. 
C)  double layer of phospholipids with hydrophilic heads facing away from one another. 
D)  double layer of phospholipids with hydrophobic tails facing away from each other (toward the cytoplasm of the cell and the extracellular solution). 
E)  single layer of phospholipids with tails pointed toward the inside of the cell. 
A)  double layer of phospholipids with hydrophobic tails facing toward one another. 
B)  single layer of phospholipids with water molecules attached along one side. 
C)  double layer of phospholipids with hydrophilic heads facing away from one another. 
D)  double layer of phospholipids with hydrophobic tails facing away from each other (toward the cytoplasm of the cell and the extracellular solution). 
E)  single layer of phospholipids with tails pointed toward the inside of the cell.

Question 20

The diffusion of water molecules across a selectively permeable membrane is called

Accepted Answer

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

Exam 5: Cell Membrane Structure and Function

Adhesion of cells within animal tissues is accomplished by cell-to-cell junctions called

Phospholipids contain two different parts: a __________head and a pair of __________tails.

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

Molecules assisted by carrier proteins may cross a selectively permeable membrane by

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?

When very small viruses infect a plant cell by crossing its membrane, the viruses often spread rapidly throughout the entire plant without crossing additional membranes. Explain how this occurs.

Which of the following requires adenosine triphosphate?

Suppose a bag made of a selectively permeable membrane was filled with a 5% solution of glucose and sealed. What would happen if the bag was placed in pure water or in a 10% glucose solution?

All of the following may influence the rate of simple diffusion across a selectively permeable membrane EXCEPT the

Compare and contrast osmosis and simple diffusion.

What is active transport?

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?

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

The net movement of molecules from a high concentration to a low concentration is best described by which of the following?

The blood plasma of a man who drinks salt water will become__________ to his red blood cells, whereas the red blood cells will be__________ to the blood plasma.

If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?

The urinary bladder is protected from leaking by cell-to-cell junctions called

The most common lipids in biological membranes are__________ .

Plasma membranes are best described as a

The diffusion of water molecules across a selectively permeable membrane is called

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

Filters

Phospholipids contain two different parts: a head and a pair of tails.

The blood plasma of a man who drinks salt water will become to his red blood cells, whereas the red blood cells will be to the blood plasma.