Question 1

Using correct terminology, describe what would happen to a red blood cell placed in a solution of 0.5% sodium chloride.

Accepted Answer

A red blood cell placed in a s

Question 2

Proteins that are destined to become associated with the inner surface of the plasma membrane are:

Accepted Answer

A)  made on free ribosomes in the cytoplasm. 
B)  manufactured in the same way as protein hormones. 
C)  made on ribosomes located on the rough endoplasmic reticulum. 
D)  transported to the plasma membrane within a secretory vesicle. 
E)  manufactured in the same way as proteins destined to become external peripheral proteins. 
A)  made on free ribosomes in the cytoplasm. 
B)  manufactured in the same way as protein hormones. 
C)  made on ribosomes located on the rough endoplasmic reticulum. 
D)  transported to the plasma membrane within a secretory vesicle. 
E)  manufactured in the same way as proteins destined to become external peripheral proteins.

Question 3

Which of the following statements about phospholipids is false ?

Accepted Answer

A)  They are amphipathic molecules. 
B)  They contain three fatty acids chains. 
C)  They contain a polar organic group attached to a phosphate group. 
D)  They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. 
E)  They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic. 
A)  They are amphipathic molecules. 
B)  They contain three fatty acids chains. 
C)  They contain a polar organic group attached to a phosphate group. 
D)  They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. 
E)  They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic.

Question 4

Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells.

Accepted Answer

A)  vesicles 
B)  gap junctions 
C)  tight junctions 
D)  anchoring junctions 
E)  cell surface receptors 
A)  vesicles 
B)  gap junctions 
C)  tight junctions 
D)  anchoring junctions 
E)  cell surface receptors

Question 5

In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened to the membrane proteins?

Accepted Answer

A)  They formed a bilayer. 
B)  They formed a spherical structure. 
C)  They moved laterally across the cell surface. 
D)  They flip-flopped from one layer to the other. 
E)  They reacted with cholesterol molecules on the membrane surface. 
A)  They formed a bilayer. 
B)  They formed a spherical structure. 
C)  They moved laterally across the cell surface. 
D)  They flip-flopped from one layer to the other. 
E)  They reacted with cholesterol molecules on the membrane surface.

Question 6

The term "fluid mosaic model" refers to the:

Accepted Answer

A)  solubility of water in the membrane. 
B)  method of substance transport across the membrane. 
C)  movement of surface proteins through the membrane. 
D)  diffusion of lipid-soluble substances through the lipid bilayer. 
E)  movement of lipids and integral proteins within the lipid bilayer. 
A)  solubility of water in the membrane. 
B)  method of substance transport across the membrane. 
C)  movement of surface proteins through the membrane. 
D)  diffusion of lipid-soluble substances through the lipid bilayer. 
E)  movement of lipids and integral proteins within the lipid bilayer.

Question 7

How are integral proteins unique in cell membranes?

Accepted Answer

A)  They have no hydrophobic portions. 
B)  They are weakly bound to the surface of the membrane. 
C)  They are only located on the inner side of a membrane. 
D)  They are firmly bound to the membrane and can only be released with a detergent. 
E)  They are completely embedded within the lipid bilayer with no exposure to the internal cell environment. 
A)  They have no hydrophobic portions. 
B)  They are weakly bound to the surface of the membrane. 
C)  They are only located on the inner side of a membrane. 
D)  They are firmly bound to the membrane and can only be released with a detergent. 
E)  They are completely embedded within the lipid bilayer with no exposure to the internal cell environment.

Question 8

Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?

Accepted Answer

A)  Each type of protein has its own function. 
B)  These proteins are manufactured by free ribosomes. 
C)  These proteins are initially formed by ribosomes on the rough ER. 
D)  These proteins pass through the ER membrane into the ER lumen. 
E)  Enzymes are needed to modify the carbohydrate chains on these proteins. 
A)  Each type of protein has its own function. 
B)  These proteins are manufactured by free ribosomes. 
C)  These proteins are initially formed by ribosomes on the rough ER. 
D)  These proteins pass through the ER membrane into the ER lumen. 
E)  Enzymes are needed to modify the carbohydrate chains on these proteins.

Question 9

Osmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute . __________________

Accepted Answer

A) True 
 B)False

Question 10

If phospholipids form a spherical structure when placed in water, then which of the following is the most logical conclusion about those phospholipid molecules?

Accepted Answer

A)  They form a bilayer. 
B)  They are cone-shaped. 
C)  They are not amphipathic. 
D)  They have two hydrophilic ends. 
E)  They contain two fatty acid chains. 
A)  They form a bilayer. 
B)  They are cone-shaped. 
C)  They are not amphipathic. 
D)  They have two hydrophilic ends. 
E)  They contain two fatty acid chains.

Question 11

Match between columns
                        Premises: membranebound enzymes
signal transduction receptors
channels
protein pumps
integrins

Accepted Answer

The Answer of Catalyze reactions which take place within or is...

Question 12

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

Accepted Answer

A)  hypertonic 
B)  hyperosmotic 
C)  hypotonic 
D)  hydrophilic 
E)  hydrophobic 
A)  hypertonic 
B)  hyperosmotic 
C)  hypotonic 
D)  hydrophilic 
E)  hydrophobic

Question 13

Sodium-potassium pumps maintain a(n) electrochemical gradient. 
__________________

Accepted Answer

A) True 
 B)False

Question 14

Figure 5-1   Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Figure A?

Accepted Answer

A)  Pinocytosis has occurred. 
B)  Plasmolysis has occurred. 
C)  There has been no net water movement. 
D)  There has been a net flow of water out of the cell. 
E)  There has been a net flow of water into the cell. 
A)  Pinocytosis has occurred. 
B)  Plasmolysis has occurred. 
C)  There has been no net water movement. 
D)  There has been a net flow of water out of the cell. 
E)  There has been a net flow of water into the cell.

Question 15

A transmembrane protein differs from other membrane proteins because it:

Accepted Answer

A)  completely extends through the membrane. 
B)  is a glycoprotein with carbohydrates attached. 
C)  is completely embedded within the membrane. 
D)  is attached to the inside of the membrane by an ionic bond. 
E)  is covalently linked to the outer surface of the plasma membrane. 
A)  completely extends through the membrane. 
B)  is a glycoprotein with carbohydrates attached. 
C)  is completely embedded within the membrane. 
D)  is attached to the inside of the membrane by an ionic bond. 
E)  is covalently linked to the outer surface of the plasma membrane.

Question 16

What facilitate the rapid transport of water through the plasma membrane?

Accepted Answer

A)  osmosis 
B)  uniporters 
C)  aquaporins 
D)  channel proteins 
E)  ABC transporters 
A)  osmosis 
B)  uniporters 
C)  aquaporins 
D)  channel proteins 
E)  ABC transporters

Question 17

Figure 5-3   In the accompanying figure, what is the role of the structures between the membranes?

Accepted Answer

A)  They provide structure to plant cells. 
B)  They provide anchorage points between adjacent cells. 
C)  They allow passage of materials through intercellular spaces. 
D)  They prevent the passage of materials through intercellular spaces. 
E)  They allow the transport of small molecules and ions between adjacent cells. 
A)  They provide structure to plant cells. 
B)  They provide anchorage points between adjacent cells. 
C)  They allow passage of materials through intercellular spaces. 
D)  They prevent the passage of materials through intercellular spaces. 
E)  They allow the transport of small molecules and ions between adjacent cells.

Question 18

If solution of A is hypotonic to B, then the direction of net movement of water is B to A . 
__________________

Accepted Answer

A) True 
 B)False

Question 19

____ are loosely associated with the phospholipid bilayer, whereas ____ are tightly bound to it.

Accepted Answer

A)  Peripheral proteins; integral proteins 
B)  Integral proteins; peripheral proteins 
C)  Glycoproteins; peripheral proteins 
D)  Integral proteins; glycoproteins 
E)  Glycolipids; glycoproteins 
A)  Peripheral proteins; integral proteins 
B)  Integral proteins; peripheral proteins 
C)  Glycoproteins; peripheral proteins 
D)  Integral proteins; glycoproteins 
E)  Glycolipids; glycoproteins

Question 20

What method does a human white blood cell employ to engulf a bacterial cell?

Accepted Answer

A)  osmosis 
B)  exocytosis 
C)  pinocytosis 
D)  phagocytosis 
E)  facilitated diffusion 
A)  osmosis 
B)  exocytosis 
C)  pinocytosis 
D)  phagocytosis 
E)  facilitated diffusion

Exam 5: Biological Membranes

Using correct terminology, describe what would happen to a red blood cell placed in a solution of 0.5% sodium chloride.

Proteins that are destined to become associated with the inner surface of the plasma membrane are:

Which of the following statements about phospholipids is false ?

Plasmodesmata of plant cells are functionally equivalent to the ____ of animal cells.

In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell, what happened to the membrane proteins?

The term "fluid mosaic model" refers to the:

How are integral proteins unique in cell membranes?

Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?

Osmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute . __________________

If phospholipids form a spherical structure when placed in water, then which of the following is the most logical conclusion about those phospholipid molecules?

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

Sodium-potassium pumps maintain a(n) electrochemical gradient. __________________

Figure 5-1 Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Figure A?

A transmembrane protein differs from other membrane proteins because it:

What facilitate the rapid transport of water through the plasma membrane?

Figure 5-3 In the accompanying figure, what is the role of the structures between the membranes?

If solution of A is hypotonic to B, then the direction of net movement of water is B to A . __________________

____ are loosely associated with the phospholipid bilayer, whereas ____ are tightly bound to it.

What method does a human white blood cell employ to engulf a bacterial cell?

A View of Life

Atoms and Molecules the Chemical Basis of Life

The Chemistry of Life Organic Compounds

Organization of the Cell

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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