Microbiology Exam 3 Review – Guided Study Notes

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Q1. In ________, a systemic allergic reaction causes symptoms such as hypotension, shock, nausea, vomiting, hives, and swelling of the throat.

Background

Topic: Hypersensitivity Reactions (Type I)

This question tests your understanding of severe allergic reactions and their clinical manifestations.

Key Terms:

Systemic allergic reaction: A body-wide response to an allergen.
Hypotension: Abnormally low blood pressure.
Shock: A life-threatening condition due to inadequate blood flow.

Step-by-Step Guidance

Recall the four types of hypersensitivity reactions and their characteristics.
Identify which type is associated with rapid, systemic symptoms after allergen exposure.
Think about the term used for a severe, rapid-onset allergic reaction that can be life-threatening.

Try solving on your own before revealing the answer!

Q2. When a self-antigen causes a type II hypersensitivity reaction, the reaction can be described as a(n) ________ disorder.

Background

Topic: Autoimmunity and Hypersensitivity

This question is about immune responses against the body's own tissues.

Key Terms:

Self-antigen: A molecule from the host's own body recognized by the immune system.
Type II hypersensitivity: Antibody-mediated cytotoxic reactions.

Step-by-Step Guidance

Review what happens when the immune system targets self-antigens.
Recall the term for diseases where the immune system attacks the body's own cells.
Connect this concept to type II hypersensitivity reactions.

Try solving on your own before revealing the answer!

Q3. Although they may be measured during diagnosis, measurement of serum ________ levels is not sufficient to confirm allergic disease.

Background

Topic: Immunoglobulins and Allergy Diagnosis

This question focuses on the role of antibodies in allergy testing.

Key Terms:

Serum: The liquid part of blood without cells or clotting factors.
Immunoglobulin: Antibody proteins (e.g., IgG, IgM, IgE, etc.).

Step-by-Step Guidance

Recall which immunoglobulin is most associated with allergic reactions.
Consider why measuring this antibody alone may not confirm an allergy.
Think about other diagnostic criteria for allergic diseases.

Try solving on your own before revealing the answer!

Q4. The first treatment for life-threatening anaphylaxis is an injection of ________.

Background

Topic: Emergency Treatment of Allergic Reactions

This question tests your knowledge of immediate interventions for severe allergic reactions.

Key Terms:

Anaphylaxis: Severe, rapid-onset allergic reaction.
First-line treatment: The initial and most important intervention.

Step-by-Step Guidance

Recall the physiological effects of anaphylaxis (e.g., airway constriction, hypotension).
Think about which medication rapidly reverses these effects.
Remember the standard emergency protocol for anaphylactic reactions.

Try solving on your own before revealing the answer!

Q5. Rh− mothers who carry Rh+ fetuses and who then become pregnant with another Rh+ fetus are given injections of ________ during the 28th week of pregnancy and after delivery.

Background

Topic: Hemolytic Disease of the Newborn (HDN) and Immunoprophylaxis

This question is about preventing maternal immune responses against fetal red blood cells.

Key Terms:

Rh factor: An antigen on red blood cells (Rh+ or Rh−).
Immunoprophylaxis: Prevention of immune response by administration of antibodies.

Step-by-Step Guidance

Recall what happens if an Rh− mother is exposed to Rh+ fetal blood.
Think about the medication given to prevent maternal sensitization.
Remember the timing of administration during pregnancy and after delivery.

Try solving on your own before revealing the answer!

Q6. TSH-receptor antibody (thyroid-stimulating immunoglobulin) is produced by individuals with ________.

Background

Topic: Autoimmune Endocrine Disorders

This question focuses on the disease associated with antibodies that stimulate the thyroid gland.

Key Terms:

TSH-receptor antibody: An antibody that binds to and activates the thyroid-stimulating hormone receptor.
Autoimmune disease: A disorder where the immune system attacks self-tissues.

Step-by-Step Guidance

Recall which disease is characterized by overproduction of thyroid hormones due to autoantibodies.
Think about the symptoms of hyperthyroidism and which disease is most common.
Connect the presence of TSH-receptor antibodies to the disease name.

Try solving on your own before revealing the answer!

Q7. The production of antibodies that target acetylcholine receptors causes ________, resulting in muscle weakness that can be severe and life threatening.

Background

Topic: Autoimmune Neuromuscular Disorders

This question is about diseases caused by antibodies interfering with nerve-muscle communication.

Key Terms:

Acetylcholine receptor: A protein on muscle cells that receives nerve signals.
Autoantibody: An antibody directed against self-antigens.

Step-by-Step Guidance

Recall which disease is caused by antibodies blocking acetylcholine receptors at the neuromuscular junction.
Think about the clinical presentation: muscle weakness, especially with activity.
Remember the name of this autoimmune disorder.

Try solving on your own before revealing the answer!

Q8. How does the ABO blood group system show codominance?

Background

Topic: Genetics of Blood Types

This question tests your understanding of inheritance patterns in blood groups.

Key Terms:

Codominance: Both alleles are fully expressed in the phenotype.
ABO blood group: Determined by the presence of A and B antigens on red blood cells.

Step-by-Step Guidance

Recall what codominance means in genetics.
Think about what happens when an individual inherits one A allele and one B allele.
Describe how both antigens are expressed on the cell surface.

Try solving on your own before revealing the answer!

Q9. What types of symptoms occur if someone is accidentally given a transfusion with the wrong blood type?

Background

Topic: Transfusion Reactions

This question is about the immune response to incompatible blood transfusions.

Key Terms:

Transfusion reaction: Immune response to foreign blood antigens.
Hemolysis: Destruction of red blood cells.

Step-by-Step Guidance

Recall what happens when incompatible blood is transfused (antigen-antibody reaction).
List the common symptoms associated with acute hemolytic transfusion reactions.
Consider both mild and severe symptoms, including those that can be life-threatening.

Try solving on your own before revealing the answer!

Q10. Colitis: Answer the following questions:

a) What is colitis?

b) Name a bacterial pathogen that causes colitis.

c) Describe the bacterial pathogen (cell shape, cell envelope, oxygen requirements) that causes colitis.

d) How can colitis be treated using the microbiome?

Background

Topic: Gastrointestinal Infections and Microbiome Therapy

This question covers the causes, characteristics, and treatment of colitis, especially focusing on the role of the microbiome.

Key Terms:

Colitis: Inflammation of the colon.
Microbiome: The community of microorganisms living in the human body.
Fecal transplant: Transfer of stool from a healthy donor to restore normal microbiota.

Step-by-Step Guidance

Define colitis and its main symptoms.
Identify a common bacterial cause of colitis (think about hospital-acquired infections).
Describe the bacterium's shape, Gram reaction, and oxygen requirements.
Explain how restoring the microbiome can help treat colitis.

Try solving on your own before revealing the answer!

Q11. Describe what the innate immune system does after someone stabs their finger with a thorn contaminated with a bacterial pathogen.

Background

Topic: Innate Immunity and Inflammatory Response

This question tests your understanding of the sequence of events in the innate immune response to injury and infection.

Key Terms:

Vasoconstriction: Narrowing of blood vessels.
Histamine: A chemical released by mast cells that increases blood flow and vascular permeability.
Diapedesis: Movement of leukocytes out of blood vessels into tissues.

Step-by-Step Guidance

Describe the immediate vascular response to injury (vasoconstriction, then vasodilation).
Explain the role of mast cells and histamine in inflammation.
Discuss how immune cells migrate to the site of infection (chemotaxis, diapedesis).
Summarize how leukocytes eliminate pathogens at the wound site.

Try solving on your own before revealing the answer!

Q12. Explain how skin acts as both a barrier and a portal of entry for pathogens.

Background

Topic: Physical Barriers in Innate Immunity

This question is about the dual role of skin in host defense and infection.

Key Terms:

Keratin: A tough protein in skin cells.
Portal of entry: A site where pathogens can enter the body.

Step-by-Step Guidance

Describe the structural and chemical features of skin that prevent infection.
Explain how breaks in the skin can allow pathogens to enter.
Discuss the importance of skin integrity in preventing disease.

Try solving on your own before revealing the answer!

Q13. How does the microbiome act as a physical and chemical barrier of the innate immune system?

Background

Topic: Role of the Microbiome in Host Defense

This question focuses on how normal flora protect against pathogens.

Key Terms:

Physical barrier: Competition for space and nutrients.
Chemical barrier: Production of antimicrobial substances.

Step-by-Step Guidance

Explain how the microbiome competes with pathogens for colonization sites.
Describe how the microbiome produces chemicals that inhibit pathogen growth.
Give examples of antimicrobial compounds produced by normal flora.

Try solving on your own before revealing the answer!

Q14. How do interferons function?

Background

Topic: Antiviral Defense Mechanisms

This question is about the role of interferons in the immune response to viral infections.

Key Terms:

Interferon: A cytokine produced in response to viral infection.
Antiviral state: Cellular changes that inhibit viral replication.

Step-by-Step Guidance

Describe when and why cells produce interferons.
Explain how interferons affect neighboring cells to prevent viral spread.
Discuss the role of interferons in activating immune cells.

Try solving on your own before revealing the answer!

Q15. Name the five functions of antibodies.

Background

Topic: Humoral Immunity

This question tests your knowledge of the various roles antibodies play in immune defense.

Key Terms:

Antibody: A protein produced by B cells that binds antigens.
Opsonization, neutralization, agglutination, complement activation, ADCC (antibody-dependent cell-mediated cytotoxicity).

Step-by-Step Guidance

List the main ways antibodies help eliminate pathogens.
Briefly define each function (e.g., neutralization, opsonization, etc.).
Connect each function to its role in immune defense.

Try solving on your own before revealing the answer!

Q16. Briefly discuss the two primary characteristics of the adaptive immune system.

Background

Topic: Adaptive Immunity

This question is about the unique features that distinguish adaptive immunity from innate immunity.

Key Terms:

Specificity: Ability to target specific antigens.
Memory: Ability to respond more rapidly upon re-exposure to the same antigen.

Step-by-Step Guidance

Define specificity in the context of adaptive immunity.
Explain the concept of immunological memory.
Discuss why these features are important for long-term protection.

Try solving on your own before revealing the answer!

Q17. ________ pathogens can cause disease when the host is immunocompromised.

Background

Topic: Types of Pathogens

This question is about pathogens that only cause disease under certain conditions.

Key Terms:

Immunocompromised: Having a weakened immune system.
Opportunistic pathogen: A microbe that causes disease when host defenses are impaired.

Step-by-Step Guidance

Recall the term for pathogens that are normally harmless but can cause disease in vulnerable hosts.
Think about examples of situations where these pathogens become problematic.

Try solving on your own before revealing the answer!

Q18. ________ permit pathogens to cause disease.

Background

Topic: Pathogenicity and Virulence

This question is about the factors that enable microbes to infect and damage the host.

Key Terms:

Virulence factors: Molecules produced by pathogens that contribute to their ability to cause disease.

Step-by-Step Guidance

Recall what features or molecules allow pathogens to invade, evade, or damage the host.
Think about examples such as toxins, adhesins, or enzymes.

Try solving on your own before revealing the answer!

Q19. ________ are anatomic locations where pathogens can pass into host tissue.

Background

Topic: Infection and Entry Sites

This question is about the entry points for pathogens into the body.

Key Terms:

Portal of entry: A site where pathogens can enter the host.

Step-by-Step Guidance

Recall the term for anatomical sites where infection can begin (e.g., skin, mucous membranes).
Think about examples of portals of entry.

Try solving on your own before revealing the answer!

Q20. A(n) ________ is a biological poison produced by certain pathogens.

Background

Topic: Microbial Toxins

This question is about substances produced by microbes that cause harm to the host.

Key Terms:

Toxin: A poisonous substance produced by living organisms.

Step-by-Step Guidance

Recall the general term for microbial poisons.
Think about examples such as botulinum toxin or diphtheria toxin.

Try solving on your own before revealing the answer!

Q21. Why must the flu vaccine (flu shot) be given every year?

Background

Topic: Influenza Virus Evolution and Immunity

This question is about antigenic variation and vaccine effectiveness.

Key Terms:

Antigenic drift: Small genetic changes in viral antigens.
Antigenic shift: Major genetic reassortment leading to new viral strains.

Step-by-Step Guidance

Explain how the influenza virus changes over time.
Discuss why these changes affect immune recognition.
Connect this to the need for annual vaccination.

Try solving on your own before revealing the answer!

Q22. Explain how Candida albicans, a fungus that is part of the normal flora/microbiota, is an opportunistic pathogen and can cause disease. What diseases can it cause?

Background

Topic: Opportunistic Fungal Infections

This question is about how normal flora can become pathogenic under certain conditions.

Key Terms:

Opportunistic pathogen: Causes disease when host defenses are compromised.
Candida albicans: A yeast that is part of the normal microbiota.

Step-by-Step Guidance

Describe the normal role of C. albicans in the body.
List factors that can lead to overgrowth and disease.
Name common diseases caused by C. albicans.
Discuss the virulence factors that contribute to its pathogenicity.

Try solving on your own before revealing the answer!

Q23. During which periods of disease progression can an active carrier transmit disease?

Background

Topic: Disease Transmission and Carriers

This question is about the stages of infectious disease and when transmission can occur.

Key Terms:

Active carrier: An individual who can transmit a pathogen to others.
Stages of disease: Incubation, prodromal, illness, decline, convalescence.

Step-by-Step Guidance

List the stages of infectious disease progression.
Consider whether transmission is possible during each stage.
Think about examples of diseases where carriers are infectious before, during, or after symptoms.

Try solving on your own before revealing the answer!

Q24. What is the difference between mechanical and biological vectors?

Background

Topic: Disease Transmission by Vectors

This question is about how infectious agents are transmitted by animals.

Key Terms:

Vector: An organism that transmits pathogens between hosts.
Mechanical vector: Transports pathogens without being infected.
Biological vector: Pathogen develops or multiplies within the vector.

Step-by-Step Guidance

Define mechanical and biological vectors.
Compare and contrast their roles in disease transmission.
Give examples of each type of vector.

Try solving on your own before revealing the answer!

Q25. How is the overuse of antibiotics contributing to the reemergence of some infectious diseases?

Background

Topic: Antibiotic Resistance

This question is about the consequences of widespread antibiotic use.

Key Terms:

Antibiotic resistance: The ability of bacteria to survive and multiply despite antibiotic treatment.
Reemergence: The return of diseases that were previously under control.

Step-by-Step Guidance

Explain how antibiotic use selects for resistant bacteria.
Discuss the impact of resistance on disease treatment and control.
Connect this to the reemergence of infectious diseases.

Try solving on your own before revealing the answer!

Q26. What is the definition of a nosocomial disease?

Background

Topic: Healthcare-Associated Infections

This question is about infections acquired in clinical settings.

Key Terms:

Nosocomial: Originating in a hospital or healthcare facility.
Healthcare-associated infection (HAI): An infection acquired during the course of receiving healthcare treatment.

Step-by-Step Guidance

Define what makes an infection "nosocomial."
Explain how nosocomial diseases differ from community-acquired infections.
Think about examples of common nosocomial infections.