Question 1

Figure 5-2
Use the figure to answer the corresponding question(s).  
-Select the receptor mediated endocytosis events that are in the correct (before, after) order:

Accepted Answer

A)  Endosome fuses with lysosome; receptors are transported to plasma membrane and recycled 
B)  Ligand binds to receptors; coated vesicle forms by endocytosis. 
C)  Contents are digested and released in the cymosely; ligand separates from its receptor. 
D)  Endosome fuses with lysosome; receptors are transported to plasma membrane and recycled. 
E)  None of the events are listed in the correct order. 
A)  Endosome fuses with lysosome; receptors are transported to plasma membrane and recycled 
B)  Ligand binds to receptors; coated vesicle forms by endocytosis. 
C)  Contents are digested and released in the cymosely; ligand separates from its receptor. 
D)  Endosome fuses with lysosome; receptors are transported to plasma membrane and recycled. 
E)  None of the events are listed in the correct order.

Question 2

Plasmodesmata of plant cells are functionally equivalent to __________ of animal cells.

Accepted Answer

A)  gap junctions 
B)  dermatomes 
C)  tight junctions 
D)  cell surface receptors 
E)  microvillus 
A)  gap junctions 
B)  dermatomes 
C)  tight junctions 
D)  cell surface receptors 
E)  microvillus

Question 3

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

Accepted Answer

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

Question 4

MATCHING
a.Transmit information into cell
d.Use ATP to transport solutes
b.Catalyze reactions which take place within or along membrane surface
e.Anchor cell to extracellular matrix
c.Allow selective transport of ions or molecules
-membranebound enzymes

Accepted Answer

The answer of MATCHING
a.Transmit information into cell
d.Use ATP to transport...

Question 5

Figure 5-2
Use the figure to answer the corresponding question(s).  
-The process illustrated in Figure 5-2 would most likely be used to transport:

Accepted Answer

A)  glucose. 
B)  hormones. 
C)  potassium ions. 
D)  carbon dioxide. 
E)  bacteria. 
A)  glucose. 
B)  hormones. 
C)  potassium ions. 
D)  carbon dioxide. 
E)  bacteria.

Question 6

Compare and contrast the structure and functions of three of the following four intercellular junctions: desmosomes, gap junctions, tight junctions, and plasmodesmata.

Accepted Answer

Desmosomes consist of discs associated w

Question 7

Cotransport systems directly provide energy for active transport of solutes.
__________________

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements about the sodium-potassium pump is true?

Accepted Answer

A)  It transports hydrogen ions out of the cell. 
B)  It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. 
C)  It transports 2 sodium ions out of the cell in exchange for 2 potassium ions. 
D)  It transports 2 sodium ions out of the cell in exchange for 3 potassium ions. 
E)  It transports water directly out of the cell. 
A)  It transports hydrogen ions out of the cell. 
B)  It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. 
C)  It transports 2 sodium ions out of the cell in exchange for 2 potassium ions. 
D)  It transports 2 sodium ions out of the cell in exchange for 3 potassium ions. 
E)  It transports water directly out of the cell.

Question 9

Plasmolysis occurs in plant cells when the soil or water contains low concentration of salts or fertilizers.
__________________

Accepted Answer

A) True 
 B)False

Question 10

The passive movement of a substance along its concentration gradient is termed:

Accepted Answer

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

Question 11

Which of the following statements explaining the differences in number and types of peripheral proteins found on the inner and outer surfaces of cell membranes is correct?

Accepted Answer

A)  The functions of the membrane differ on the inside and outside of the cell. 
B)  Not all proteins can pass through the membrane and, thus, more accumulate on the inside. 
C)  Proteins on the outside of the membrane are synthesized at a slower rate than proteins on the inside of the membrane. 
D)  Proteins on the outside of membrane are made extracellularly and are unable to penetrate the phospholipid bilayer and enter the cell. 
E)  The external peripheral proteins are weakly attached to the membrane and are readily washed away. 
A)  The functions of the membrane differ on the inside and outside of the cell. 
B)  Not all proteins can pass through the membrane and, thus, more accumulate on the inside. 
C)  Proteins on the outside of the membrane are synthesized at a slower rate than proteins on the inside of the membrane. 
D)  Proteins on the outside of membrane are made extracellularly and are unable to penetrate the phospholipid bilayer and enter the cell. 
E)  The external peripheral proteins are weakly attached to the membrane and are readily washed away.

Question 12

One difference between tight junctions and dermatomes is that tight junctions:

Accepted Answer

A)  are regions where the plasma membrane from two neighboring cells are in actual contact. 
B)  occur only in plants. 
C)  involve connective microfilaments that traverse the space between adjacent cells. 
D)  are anchored by microfilaments on the insides of the cell membranes of adjacent cells. 
E)  contain a 24 nm space between two adjacent membranes. 
A)  are regions where the plasma membrane from two neighboring cells are in actual contact. 
B)  occur only in plants. 
C)  involve connective microfilaments that traverse the space between adjacent cells. 
D)  are anchored by microfilaments on the insides of the cell membranes of adjacent cells. 
E)  contain a 24 nm space between two adjacent membranes.

Question 13

Who proposed the fluid mosaic model of cell membrane structure in 1972?

Accepted Answer

A)  Davson and Singer 
B)  Frye and Edidin 
C)  Brown and Goldstein 
D)  Singer and Nicholson 
E)  Davson and Danielli 
A)  Davson and Singer 
B)  Frye and Edidin 
C)  Brown and Goldstein 
D)  Singer and Nicholson 
E)  Davson and Danielli

Question 14

If the concentration of solutes in a cell is less than the concentration of solutes in the surrounding fluid, then the extracellular fluid is said to be:

Accepted Answer

A)  hypertonic. 
B)  hypotonic. 
C)  isotonic. 
D)  stable. 
E)  amphipathic. 
A)  hypertonic. 
B)  hypotonic. 
C)  isotonic. 
D)  stable. 
E)  amphipathic.

Question 15

Figure 5-1
Use the figure to answer the corresponding question(s).  
-A patient who has had a severe hemorrhage accidentally receives a large transfusion of distilled water directly into a major blood vessel.You would expect this mistake to:

Accepted Answer

A)  have no unfavorable effect as long as the water is free of bacteria. 
B)  have serious, perhaps fatal consequences because there would be too much fluid to pump. 
C)  have serious, perhaps fatal consequences because the red blood cells could shrink. 
D)  have serious, perhaps fatal consequences because the red blood cells could swell and burst. 
E)  have no serious effect because the kidney could quickly eliminate excess water. 
A)  have no unfavorable effect as long as the water is free of bacteria. 
B)  have serious, perhaps fatal consequences because there would be too much fluid to pump. 
C)  have serious, perhaps fatal consequences because the red blood cells could shrink. 
D)  have serious, perhaps fatal consequences because the red blood cells could swell and burst. 
E)  have no serious effect because the kidney could quickly eliminate excess water.

Question 16

Which of the following statements concerning phospholipids is FALSE?

Accepted Answer

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

Question 17

Receptor-mediated endocytosis:

Accepted Answer

A)  is a passive process. 
B)  involves only membrane transport proteins. 
C)  brings about the selective uptake of materials by enclosing them in membranous vesicles. 
D)  does not require energy. 
E)  is most likely to be found in cells that release large amounts of hormones. 
A)  is a passive process. 
B)  involves only membrane transport proteins. 
C)  brings about the selective uptake of materials by enclosing them in membranous vesicles. 
D)  does not require energy. 
E)  is most likely to be found in cells that release large amounts of hormones.

Question 18

MATCHING
a.Transmit information into cell
d.Use ATP to transport solutes
b.Catalyze reactions which take place within or along membrane surface
e.Anchor cell to extracellular matrix
c.Allow selective transport of ions or molecules
-Describe some of the various activities performed by membrane proteins in multicellular organisms.

Accepted Answer

Concepts to Consider: Formatio

Question 19

Penicillin is toxic to certain dividing bacterial cells because it prevents cell wall formation, causing the cells to burst.This indicates that the bacteria live in:

Accepted Answer

A)  a hypotonic medium. 
B)  a hypertonic medium. 
C)  an isotonic medium. 
D)  a medium with a higher osmotic pressure than the cell. 
E)  both a hypertonic medium and a medium with a higher osmotic pressure than the cell. 
A)  a hypotonic medium. 
B)  a hypertonic medium. 
C)  an isotonic medium. 
D)  a medium with a higher osmotic pressure than the cell. 
E)  both a hypertonic medium and a medium with a higher osmotic pressure than the cell.

Question 20

Which of the following statements about lipid bilayers is FALSE?

Accepted Answer

A)  They are self-sealing. 
B)  They are inflexible. 
C)  They spontaneously form closed vesicles. 
D)  They can fuse with other bilayers. 
E)  They resist forming free ends. 
A)  They are self-sealing. 
B)  They are inflexible. 
C)  They spontaneously form closed vesicles. 
D)  They can fuse with other bilayers. 
E)  They resist forming free ends.

Exam 5: Biological Membranes

Figure 5-2 Use the figure to answer the corresponding question(s). -Select the receptor mediated endocytosis events that are in the correct (before, after) order:

Plasmodesmata of plant cells are functionally equivalent to __________ of animal cells.

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

MATCHING a.Transmit information into cell d.Use ATP to transport solutes b.Catalyze reactions which take place within or along membrane surface e.Anchor cell to extracellular matrix c.Allow selective transport of ions or molecules -membranebound enzymes

Figure 5-2 Use the figure to answer the corresponding question(s). -The process illustrated in Figure 5-2 would most likely be used to transport:

Compare and contrast the structure and functions of three of the following four intercellular junctions: desmosomes, gap junctions, tight junctions, and plasmodesmata.

Cotransport systems directly provide energy for active transport of solutes. __________________

Which of the following statements about the sodium-potassium pump is true?

Plasmolysis occurs in plant cells when the soil or water contains low concentration of salts or fertilizers. __________________

The passive movement of a substance along its concentration gradient is termed:

Which of the following statements explaining the differences in number and types of peripheral proteins found on the inner and outer surfaces of cell membranes is correct?

One difference between tight junctions and dermatomes is that tight junctions:

Who proposed the fluid mosaic model of cell membrane structure in 1972?

If the concentration of solutes in a cell is less than the concentration of solutes in the surrounding fluid, then the extracellular fluid is said to be:

Figure 5-1 Use the figure to answer the corresponding question(s). -A patient who has had a severe hemorrhage accidentally receives a large transfusion of distilled water directly into a major blood vessel.You would expect this mistake to:

Which of the following statements concerning phospholipids is FALSE?

Receptor-mediated endocytosis:

Penicillin is toxic to certain dividing bacterial cells because it prevents cell wall formation, causing the cells to burst.This indicates that the bacteria live in:

Which of the following statements about lipid bilayers is FALSE?

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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