Question 1

The life cycle form of the malaria parasite Plasmodium falciparum that is transferred from the mosquito to a human is called a(n)_____________________.

Accepted Answer

The answer of The life cycle form of the malaria...

Question 2

The parasite Trypanosoma brucei is able to avoid host defense mechanisms through the production of a potent exotoxin.

Accepted Answer

A) True 
 B)False

Question 3

Why are individuals who are heterozygous for the sickle cell trait partially protected from developing malaria?

Accepted Answer

A)  They make antibody against the malarial pathogen. 
B)  Their infected red blood cells become sickled and are destroyed. 
C)  They develop a strong cell-mediated response against the malarial pathogen. 
D)  Their red blood cells cannot be infected by the malarial pathogen. 
E)  Their red blood cells contain very little hemoglobin. 
A)  They make antibody against the malarial pathogen. 
B)  Their infected red blood cells become sickled and are destroyed. 
C)  They develop a strong cell-mediated response against the malarial pathogen. 
D)  Their red blood cells cannot be infected by the malarial pathogen. 
E)  Their red blood cells contain very little hemoglobin.

Question 4

AIDS patients are more susceptible to developing pneumonia caused by ___________ than individuals with a normal functioning immune system.

Accepted Answer

A)  Streptococcus pneumoniae 
B)  Staphylococcus aureus 
C)  Haemophilus influenza 
D)  Pneumocystis jiroveci 
E)  Klebsiella pneumoniae 
A)  Streptococcus pneumoniae 
B)  Staphylococcus aureus 
C)  Haemophilus influenza 
D)  Pneumocystis jiroveci 
E)  Klebsiella pneumoniae

Question 5

Which of these is an example of an opportunistic disease-causing protozoan in AIDS patients?

Accepted Answer

A)  Plasmodium vivax 
B)  Trypanosoma brucei 
C)  Giardia lamblia 
D)  Entamoeba histolytica 
E)  Toxoplasma gondii 
A)  Plasmodium vivax 
B)  Trypanosoma brucei 
C)  Giardia lamblia 
D)  Entamoeba histolytica 
E)  Toxoplasma gondii

Question 6

Some eukaryal pathogens have influenced the evolution of their human host.

Accepted Answer

A) True 
 B)False

Question 7

Trypanosoma brucei gambiense is the causative agent of what disease?

Accepted Answer

A)  malaria 
B)  African sleeping sickness 
C)  yellow fever 
D)  diarrheal disease 
E)  dengue fever 
A)  malaria 
B)  African sleeping sickness 
C)  yellow fever 
D)  diarrheal disease 
E)  dengue fever

Question 8

The fungus Pneumocystis jiroveci primarily causes disease in immunocompromised individuals.

Accepted Answer

A) True 
 B)False

Question 9

What is the key mechanism in establishing giardial diarrhea?

Accepted Answer

A)  The excretion of an enterotoxin by Giardia. 
B)  The destruction of intestinal epithelial cells by Giardia. 
C)  The attachment of Giardia trophozoites to intestinal epithelia. 
D)  The invasion of Giardia into the intestinal epithelial cells. 
E)  The production of a cytolytic exotoxin by Giardia. 
A)  The excretion of an enterotoxin by Giardia. 
B)  The destruction of intestinal epithelial cells by Giardia. 
C)  The attachment of Giardia trophozoites to intestinal epithelia. 
D)  The invasion of Giardia into the intestinal epithelial cells. 
E)  The production of a cytolytic exotoxin by Giardia.

Question 10

The female Anopheles mosquito serves as the definitive host in the life cycle of the malarial pathogen Plasmodium falciparum.

Accepted Answer

A) True 
 B)False

Question 11

Describe the life cycle of the parasite Giardia lamblia.

Accepted Answer

The life cycle of the parasite Giardia l

Question 12

The merozoite form of Plasmodium sp.specializes in the digestion and use of _____________ as its primary nutrient source.

Accepted Answer

A)  DNA 
B)  RNA 
C)  membrane lipids 
D)  mitochondria 
E)  hemoglobin 
A)  DNA 
B)  RNA 
C)  membrane lipids 
D)  mitochondria 
E)  hemoglobin

Question 13

When an Anopheles mosquito feeds on a person with malaria,it ingests the ___________ form of the parasite.

Accepted Answer

A)  gametocyte 
B)  sporozoite 
C)  merozoite 
D)  oocyst 
E)  zygote 
A)  gametocyte 
B)  sporozoite 
C)  merozoite 
D)  oocyst 
E)  zygote

Question 14

How do many phytopathogenic fungi obtain nutrients from plant host cells?

Accepted Answer

A)  By excreting enzymes to breakdown plant cell walls. 
B)  By excreting exotoxins to kill plant cells. 
C)  By stimulating the host cells to excrete sugars. 
D)  By stimulating the plant to increase photosynthesis. 
E)  By producing proteins to scavenge nutrients away from the plant. 
A)  By excreting enzymes to breakdown plant cell walls. 
B)  By excreting exotoxins to kill plant cells. 
C)  By stimulating the host cells to excrete sugars. 
D)  By stimulating the plant to increase photosynthesis. 
E)  By producing proteins to scavenge nutrients away from the plant.

Question 15

The fungus Pyrenophora tritici-repentis causes disease in wheat.Only strains of P.tritici-repentis that contain the ToxA gene are able to cause disease; other strains are avirulent.The appearance of the toxin gene is recent; how does research indicate this gene was acquired?

Accepted Answer

A)  It is the result of mutation in a pigment gene in the fungus. 
B)  It is the result of a mutation that up-regulated the expression of the previously non-expressed gene. 
C)  It was transferred from a pathogenic bacterium to P. tritici-repentis. 
D)  It was transferred from another pathogenic fungus to P. tritici-repentis. 
E)  It was acquired through the rearrangement of two other genes in P. tritici-repentis. 
A)  It is the result of mutation in a pigment gene in the fungus. 
B)  It is the result of a mutation that up-regulated the expression of the previously non-expressed gene. 
C)  It was transferred from a pathogenic bacterium to P. tritici-repentis. 
D)  It was transferred from another pathogenic fungus to P. tritici-repentis. 
E)  It was acquired through the rearrangement of two other genes in P. tritici-repentis.

Question 16

People develop giardiasis by consuming water containing Giardia lamblia ____________.

Accepted Answer

The answer of People develop giardiasis by consuming water containing...

Question 17

Which of these may result in Candida albicans causing disease in immunocompetent people?

Accepted Answer

A)  A change in the microflora because of antibiotic therapy. 
B)  A change in the antigenicity of the fungus. 
C)  The production of a potent exotoxin by the fungus. 
D)  Consumption of contaminated water containing the fungus. 
E)  Sexual transmission of the fungus. 
A)  A change in the microflora because of antibiotic therapy. 
B)  A change in the antigenicity of the fungus. 
C)  The production of a potent exotoxin by the fungus. 
D)  Consumption of contaminated water containing the fungus. 
E)  Sexual transmission of the fungus.

Question 18

Most of the clinical symptoms observed in an individual with malaria result from this activity.

Accepted Answer

A)  Sporozoite infection of the liver. 
B)  Sporozoite infection of muscle. 
C)  Lysis of red blood cells by merozoites. 
D)  Infection of white-blood cells by merozoites. 
E)  Parasite infection of the brain cells. 
A)  Sporozoite infection of the liver. 
B)  Sporozoite infection of muscle. 
C)  Lysis of red blood cells by merozoites. 
D)  Infection of white-blood cells by merozoites. 
E)  Parasite infection of the brain cells.

Question 19

Trypanosomes have a complex life cycle that involves both an insect and mammal host.

Accepted Answer

A) True 
 B)False

Question 20

What is the causative agent of malaria?

Accepted Answer

A)  a fungus 
B)  a virus 
C)  a bacterium 
D)  a protozoan 
E)  a helminth 
A)  a fungus 
B)  a virus 
C)  a bacterium 
D)  a protozoan 
E)  a helminth

Exam 23: Eukaryal Microbe Pathogenesis

The life cycle form of the malaria parasite Plasmodium falciparum that is transferred from the mosquito to a human is called a(n)_____________________.

The parasite Trypanosoma brucei is able to avoid host defense mechanisms through the production of a potent exotoxin.

Why are individuals who are heterozygous for the sickle cell trait partially protected from developing malaria?

AIDS patients are more susceptible to developing pneumonia caused by ___________ than individuals with a normal functioning immune system.

Which of these is an example of an opportunistic disease-causing protozoan in AIDS patients?

Some eukaryal pathogens have influenced the evolution of their human host.

Trypanosoma brucei gambiense is the causative agent of what disease?

The fungus Pneumocystis jiroveci primarily causes disease in immunocompromised individuals.

What is the key mechanism in establishing giardial diarrhea?

The female Anopheles mosquito serves as the definitive host in the life cycle of the malarial pathogen Plasmodium falciparum.

Describe the life cycle of the parasite Giardia lamblia.

The merozoite form of Plasmodium sp.specializes in the digestion and use of _____________ as its primary nutrient source.

When an Anopheles mosquito feeds on a person with malaria,it ingests the ___________ form of the parasite.

How do many phytopathogenic fungi obtain nutrients from plant host cells?

The fungus Pyrenophora tritici-repentis causes disease in wheat.Only strains of P.tritici-repentis that contain the ToxA gene are able to cause disease; other strains are avirulent.The appearance of the toxin gene is recent; how does research indicate this gene was acquired?

People develop giardiasis by consuming water containing Giardia lamblia ____________.

Which of these may result in Candida albicans causing disease in immunocompetent people?

Most of the clinical symptoms observed in an individual with malaria result from this activity.

Trypanosomes have a complex life cycle that involves both an insect and mammal host.

What is the causative agent of malaria?

The Microbial World

Bacteria

Eukaryal Microbes

Archaea

Viruses

Cultivating Microorganisms

DNA Replication and Gene Expression

Viral Replication Strategies

Bacterial Genetic Analysis

Microbial Genomics

Regulation of Gene Expression

Microbial Biotechnology

Metabolism

Biogeochemical Cycles

Microbial Ecosystems

The Microbiology of Food and Water

Microbial Symbionts

Introduction to Infectious Diseases

Innate Host Defenses Against Microbial Invasion

Adaptive Immunity

Survival in the Host

Viral Pathogenesis

Control of Infectious Diseases

Filters