Question 1

Mammalian red blood cells contain which type of membrane?

Accepted Answer

A)  Plasma membrane 
B)  Biological membrane 
C)  Trans membrane 
D)  Peripheral membrane 
E)  Integral membrane 
A)  Plasma membrane 
B)  Biological membrane 
C)  Trans membrane 
D)  Peripheral membrane 
E)  Integral membrane A

Question 2

Why can cholesterol act as a "fluidity buffer" in cell membranes?

Accepted Answer

A)  It is slightly amphipathic because of the presence of one hydroxyl group. 
B)  It is slightly hydrophobic because of the presence of one hydroxyl group. 
C)  It is slightly hydrophobic because of the presence of one carboxyl group. 
D)  It is slightly amphipathic because of the presence of one carboxyl group. 
E)  It is slightly hydrophilic because of the presence of one hydrocarbon group. 
A)  It is slightly amphipathic because of the presence of one hydroxyl group. 
B)  It is slightly hydrophobic because of the presence of one hydroxyl group. 
C)  It is slightly hydrophobic because of the presence of one carboxyl group. 
D)  It is slightly amphipathic because of the presence of one carboxyl group. 
E)  It is slightly hydrophilic because of the presence of one hydrocarbon group. A

Question 3

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

Question 4

Identify and discuss three different roles for membrane proteins.

Accepted Answer

1. Transport proteins: These membrane pr

Question 5

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 6

What happens during the cotransport of glucose and sodium ions?

Accepted Answer

A)  The transport of glucose powers the transport of sodium. 
B)  ATP causes a conformational change in the carrier protein. 
C)  Both D and E 
D)  Glucose molecules are transported against their concentration gradient. 
E)  Sodium ions are transported down their concentration gradient. 
A)  The transport of glucose powers the transport of sodium. 
B)  ATP causes a conformational change in the carrier protein. 
C)  Both D and E 
D)  Glucose molecules are transported against their concentration gradient. 
E)  Sodium ions are transported down their concentration gradient.

Question 7

Carrier proteins are also called ______.

Accepted Answer

A)  passive transport 
B)  active transport 
C)  aquaporins 
D)  pores 
E)  transporters 
A)  passive transport 
B)  active transport 
C)  aquaporins 
D)  pores 
E)  transporters

Question 8

Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?

Accepted Answer

A)  The active transport of glucose 
B)  The very fast turnover rate of glucose metabolism 
C)  The ability of the cell to engulf glucose by pinocytosis 
D)  The continuous excretion of glucose from other parts of the cell 
E)  The rapid addition of a phosphate to the glucose molecules 
A)  The active transport of glucose 
B)  The very fast turnover rate of glucose metabolism 
C)  The ability of the cell to engulf glucose by pinocytosis 
D)  The continuous excretion of glucose from other parts of the cell 
E)  The rapid addition of a phosphate to the glucose molecules

Question 9

Figure 5-2  
 
Consider the cellular process illustrated in the accompanying figure. What substance would most likely be transported in this manner?

Accepted Answer

A)  Glucose 
B)  Bacteria 
C)  Hormones 
D)  Potassium ions 
E)  Carbon dioxide 
A)  Glucose 
B)  Bacteria 
C)  Hormones 
D)  Potassium ions 
E)  Carbon dioxide

Question 10

A molecule that binds specifically to a receptor is called a ______________.

Accepted Answer

A)  ligand 
B)  clathrin 
C)  endosome 
D)  macrophage 
E)  low-density lipoprotein 
A)  ligand 
B)  clathrin 
C)  endosome 
D)  macrophage 
E)  low-density lipoprotein

Question 11

How do the phospholipids in vegetable oil differ from those of animal fat?

Accepted Answer

A)  The fatty acid tails bend. 
B)  The fatty acid tails lack double bonds. 
C)  The fatty acid tails are a chain of saturated fats. 
D)  The fatty acid tails solidify at room temperature. 
E)  The fatty acid tails interact via van der Waals forces. 
A)  The fatty acid tails bend. 
B)  The fatty acid tails lack double bonds. 
C)  The fatty acid tails are a chain of saturated fats. 
D)  The fatty acid tails solidify at room temperature. 
E)  The fatty acid tails interact via van der Waals forces.

Question 12

Compare and contrast the processes of facilitated diffusion and active transport.

Accepted Answer

Concepts to Consider: Facilitated diffus

Question 13

Figure 5-1 ​
 
Refer to the accompanying figure. Which best describes what is happening to the red blood cells in Fig. 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 14

Match between columns
                        Premises: membrane-bound enzymes

Accepted Answer

The Answer of Anchor cell to extracellular matrix and Catalyze is...

Question 15

The term "fluid mosaic model" refers to

Accepted Answer

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

Question 16

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 17

The peripheral membrane proteins can be easily removed without disrupting the bilayer structure of the membrane.

Accepted Answer

A) True 
 B)False

Question 18

Briefly describe what would happen to red blood cells placed in a solution of 0.5% sodium chloride.

Accepted Answer

Physiological saline, a solution of 0.9%

Question 19

Which molecule is least likely to cross a cellular membrane by simple diffusion?

Accepted Answer

A)  Water 
B)  Oxygen 
C)  Nitrogen 
D)  Potassium ion 
E)  Carbon dioxide 
A)  Water 
B)  Oxygen 
C)  Nitrogen 
D)  Potassium ion 
E)  Carbon dioxide

Question 20

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. 
E)  They are completely embedded within the lipid bilayer. 
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. 
E)  They are completely embedded within the lipid bilayer.

Exam 5: Biological Membranes

Mammalian red blood cells contain which type of membrane?

Why can cholesterol act as a "fluidity buffer" in cell membranes?

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

Identify and discuss three different roles for membrane proteins.

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

What happens during the cotransport of glucose and sodium ions?

Carrier proteins are also called ______.

Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?

Figure 5-2 Consider the cellular process illustrated in the accompanying figure. What substance would most likely be transported in this manner?

A molecule that binds specifically to a receptor is called a ______________.

How do the phospholipids in vegetable oil differ from those of animal fat?

Compare and contrast the processes of facilitated diffusion and active transport.

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

The term "fluid mosaic model" refers to

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

The peripheral membrane proteins can be easily removed without disrupting the bilayer structure of the membrane.

Briefly describe what would happen to red blood cells placed in a solution of 0.5% sodium chloride.

Which molecule is least likely to cross a cellular membrane by simple diffusion?

How are integral proteins unique in cell membranes?

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

Filters

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