Question 1

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 spherical structure. 
B)  They formed a bilayer. 
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 spherical structure. 
B)  They formed a bilayer. 
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 2

Which of the following are forms of carrier-mediated transport?

Accepted Answer

A)  Facilitated diffusion only 
B)  Carrier-mediated active transport only 
C)  Osmosis only 
D)  Both facilitated diffusion and carrier-mediated active transport 
E)  Facilitated diffusion, carrier-mediated active transport, and osmosis 
A)  Facilitated diffusion only 
B)  Carrier-mediated active transport only 
C)  Osmosis only 
D)  Both facilitated diffusion and carrier-mediated active transport 
E)  Facilitated diffusion, carrier-mediated active transport, and osmosis

Question 3

Sodium-potassium pumps maintain an electrochemical gradient.
__________________

Accepted Answer

A) True 
 B)False

Question 4

Which of the following describes how facilitated diffusion is powered?

Accepted Answer

A)  Facilitated diffusion is "free of cost." 
B)  Energy is required to do the work of establishing and maintaining a concentration gradient. 
C)  ATP is required directly. 
D)  The sodium-potassium pump powers facilitated diffusion. 
E)  Facilitated diffusion is powered by endocytosis. 
A)  Facilitated diffusion is "free of cost." 
B)  Energy is required to do the work of establishing and maintaining a concentration gradient. 
C)  ATP is required directly. 
D)  The sodium-potassium pump powers facilitated diffusion. 
E)  Facilitated diffusion is powered by endocytosis.

Question 5

Pinocytosis:

Accepted Answer

A)  is engulfment of large particles by the cell. 
B)  occurs in protozoans and algae but not in more complex organisms. 
C)  involves the specific binding of molecules to receptors on the cell surface. 
D)  is the nonspecific uptake of fluids by pinching inward of the plasma membrane. 
E)  is movement of molecules against the concentration gradient through a permeable membrane. 
A)  is engulfment of large particles by the cell. 
B)  occurs in protozoans and algae but not in more complex organisms. 
C)  involves the specific binding of molecules to receptors on the cell surface. 
D)  is the nonspecific uptake of fluids by pinching inward of the plasma membrane. 
E)  is movement of molecules against the concentration gradient through a permeable membrane.

Question 6

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 7

A wilted flower placed in a vase of water for several hours became stiff and stood erect.When it was placed in a salt solution, it wilted.From this information we can say that the cells of the flower are:

Accepted Answer

A)  hypotonic to both fresh water and the salt solution. 
B)  hypertonic to both the fresh water and the salt solution. 
C)  hypertonic to fresh water but hypotonic to the salt solution. 
D)  hypotonic to fresh water but hypertonic to the salt solution. 
E)  isotonic to fresh water but hypotonic to the salt solution. 
A)  hypotonic to both fresh water and the salt solution. 
B)  hypertonic to both the fresh water and the salt solution. 
C)  hypertonic to fresh water but hypotonic to the salt solution. 
D)  hypotonic to fresh water but hypertonic to the salt solution. 
E)  isotonic to fresh water but hypotonic to the salt solution.

Question 8

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 9

In the mechanism of action of a proton pump, the role of ATP is to:

Accepted Answer

A)  cause a proton to bind to a carbohydrate. 
B)  cause a cell to take up protons by endocytosis. 
C)  cause a cell to release protons by exocytosis. 
D)  transfer protons to the inside of a cell. 
E)  transfer protons to the outside of a cell. 
A)  cause a proton to bind to a carbohydrate. 
B)  cause a cell to take up protons by endocytosis. 
C)  cause a cell to release protons by exocytosis. 
D)  transfer protons to the inside of a cell. 
E)  transfer protons to the outside of a cell.

Question 10

Compare and contrast simple diffusion, osmosis, and facilitated diffusion.

Accepted Answer

Simple diffusion, osmosis, and facilitat

Question 11

Which of the following is not a characteristic of aquaporins?

Accepted Answer

A)  They are transmembrane proteins. 
B)  They facilitate the rapid transport of water through the plasma membrane. 
C)  They are located in mammalian kidney tubules. 
D)  They respond to specific hormones. 
E)  They cause dehydration. 
A)  They are transmembrane proteins. 
B)  They facilitate the rapid transport of water through the plasma membrane. 
C)  They are located in mammalian kidney tubules. 
D)  They respond to specific hormones. 
E)  They cause dehydration.

Question 12

In the sodium-potassium pump, sodium ion release causes two K+ ions to be released into the cell.
__________________

Accepted Answer

A) True 
 B)False

Question 13

A key discovery that weakened the Davson-Danielli "sandwich" model of cell membranes was that:

Accepted Answer

A)  membrane proteins form a solid sheet on either side of the phospholipid bilayer. 
B)  membrane proteins form a solid sheet separating the phospholipid layer. 
C)  the phospholipids do not associate with each other in the hydrophobic region of membranes. 
D)  membrane proteins were not uniform and did not form flattened sheets. 
E)  membrane proteins occurred in regular organized patterns on the surface of membranes. 
A)  membrane proteins form a solid sheet on either side of the phospholipid bilayer. 
B)  membrane proteins form a solid sheet separating the phospholipid layer. 
C)  the phospholipids do not associate with each other in the hydrophobic region of membranes. 
D)  membrane proteins were not uniform and did not form flattened sheets. 
E)  membrane proteins occurred in regular organized patterns on the surface of membranes.

Question 14

In cell membranes cholesterol and glycoproteins are exposed to the extracellular surface for cell recognition and adhesion to other cells.
__________________

Accepted Answer

A) True 
 B)False

Question 15

Vegetable oil is different from animal fat in that the phospholipids in vegetable oil have fatty acid tails that:

Accepted Answer

A)  solidify at room temperature. 
B)  lack double bonds. 
C)  are saturated. 
D)  interact via van der Waals forces. 
E)  bend. 
A)  solidify at room temperature. 
B)  lack double bonds. 
C)  are saturated. 
D)  interact via van der Waals forces. 
E)  bend.

Question 16

A human white blood cell engulfs a bacterial cell by:

Accepted Answer

A)  carrier-mediated facilitated diffusion. 
B)  exocytosis. 
C)  phagocytosis. 
D)  pinocytosis. 
E)  the sodium-potassium pump. 
A)  carrier-mediated facilitated diffusion. 
B)  exocytosis. 
C)  phagocytosis. 
D)  pinocytosis. 
E)  the sodium-potassium pump.

Question 17

Figure 5-2
Use the figure to answer the corresponding question(s).  
-The process illustrated in Figure 5-2 is called:

Accepted Answer

A)  facilitated diffusion. 
B)  pinocytosis. 
C)  cotransport. 
D)  lysis. 
E)  exocytosis. 
A)  facilitated diffusion. 
B)  pinocytosis. 
C)  cotransport. 
D)  lysis. 
E)  exocytosis.

Exam 5: Biological Membranes

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?

Which of the following are forms of carrier-mediated transport?

Sodium-potassium pumps maintain an electrochemical gradient. __________________

Which of the following describes how facilitated diffusion is powered?

Pinocytosis:

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

A wilted flower placed in a vase of water for several hours became stiff and stood erect.When it was placed in a salt solution, it wilted.From this information we can say that the cells of the flower are:

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. __________________

In the mechanism of action of a proton pump, the role of ATP is to:

Compare and contrast simple diffusion, osmosis, and facilitated diffusion.

Which of the following is not a characteristic of aquaporins?

In the sodium-potassium pump, sodium ion release causes two K+ ions to be released into the cell. __________________

A key discovery that weakened the Davson-Danielli "sandwich" model of cell membranes was that:

In cell membranes cholesterol and glycoproteins are exposed to the extracellular surface for cell recognition and adhesion to other cells. __________________

Vegetable oil is different from animal fat in that the phospholipids in vegetable oil have fatty acid tails that:

A human white blood cell engulfs a bacterial cell by:

Figure 5-2 Use the figure to answer the corresponding question(s). -The process illustrated in Figure 5-2 is called:

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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