Biology ยท General Awareness

Vaccination and Immunity

997 Questions

This hub presents questions focused on vaccination and human immunity. It covers essential topics such as herd immunity, non-specific immunity, antigens, and historical vaccine developments. These concepts are crucial for general science sections in medical and civil service exams.

Herd immunity functionsNon-specific immunitySmallpox vaccinationInterferon proteinsAntigen propertiesImmunological amnesia

Vaccination and Immunity Questions

Multiple choice

Which of the following is an example of a recombinant DNA vaccine?

  1. Hepatitis B vaccine

  2. Human papillomavirus vaccine

  3. Measles vaccine

  4. Polio vaccine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Recombinant DNA vaccines are produced using genetic engineering techniques to insert specific genes from the pathogen into a harmless carrier organism.

Multiple choice

Which cultural practice is commonly used to reduce the risk of disease transmission in livestock?

  1. Vaccinating animals

  2. Providing adequate ventilation in livestock housing

  3. Maintaining proper sanitation and hygiene

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vaccination, proper ventilation, and maintaining good sanitation and hygiene are all important cultural practices that can help reduce the risk of disease transmission in livestock.

Multiple choice

What is the primary goal of vaccination in livestock production?

  1. To prevent disease outbreaks

  2. To treat diseases

  3. To improve animal growth and performance

  4. To reduce the need for chemical antibiotics
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vaccination is primarily used to prevent disease outbreaks by stimulating the animal's immune system to develop immunity against specific diseases.

Multiple choice

What is the role of Memory T cells in the immune response?

  1. Providing long-term immunity

  2. Recognizing and killing infected cells

  3. Producing antibodies

  4. Suppressing immune responses
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Memory T cells are long-lived T cells that provide long-term immunity against pathogens. They can quickly respond to a secondary infection by the same pathogen, leading to a faster and more robust immune response.

Multiple choice

What was the name of the vaccine developed to combat COVID-19?

  1. Pfizer-BioNTech

  2. Moderna

  3. Johnson & Johnson

  4. AstraZeneca
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Pfizer-BioNTech, Moderna, Johnson & Johnson, and AstraZeneca are all vaccines developed to combat COVID-19.

Multiple choice

Which type of vaccine contains live, attenuated pathogens?

  1. Inactivated vaccines

  2. Live attenuated vaccines

  3. Toxoid vaccines

  4. Subunit vaccines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Live attenuated vaccines contain weakened forms of the pathogen that are still capable of replicating, but are unable to cause disease. They provide long-lasting immunity and are commonly used for diseases such as measles, mumps, and rubella.

Multiple choice

What is the mechanism of action of a toxoid vaccine?

  1. It stimulates the production of antibodies against toxins

  2. It prevents the replication of the pathogen

  3. It enhances the activity of phagocytes

  4. It directly kills the pathogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Toxoid vaccines contain inactivated toxins produced by bacteria. They induce the immune system to produce antibodies that neutralize the toxins, preventing the development of disease symptoms.

Multiple choice

Which type of vaccine is composed of purified components of a pathogen?

  1. Inactivated vaccines

  2. Live attenuated vaccines

  3. Toxoid vaccines

  4. Subunit vaccines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Subunit vaccines contain purified components, such as proteins or polysaccharides, derived from the pathogen. They are less likely to cause adverse reactions compared to live attenuated vaccines and are commonly used for diseases such as hepatitis B and influenza.

Multiple choice

Which type of immunotherapy involves the use of monoclonal antibodies?

  1. Adoptive cell therapy

  2. Immune checkpoint inhibitors

  3. Cancer vaccines

  4. Antibody-drug conjugates
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibody-drug conjugates are a type of immunotherapy that combines a monoclonal antibody with a cytotoxic drug. The antibody targets specific molecules on cancer cells, delivering the drug directly to the cancer cells, resulting in their destruction.

Multiple choice

What is the mechanism of action of immune checkpoint inhibitors?

  1. They stimulate the production of antibodies against cancer cells

  2. They enhance the activity of phagocytes

  3. They block inhibitory signals on immune cells, unleashing their anti-tumor response

  4. They directly kill cancer cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Immune checkpoint inhibitors work by blocking inhibitory signals on immune cells, such as PD-1 and CTLA-4. This allows the immune cells to become more active and effectively target and destroy cancer cells.

Multiple choice

Which type of immunotherapy involves the modification of a patient's own T cells to enhance their anti-tumor activity?

  1. Adoptive cell therapy

  2. Immune checkpoint inhibitors

  3. Cancer vaccines

  4. Antibody-drug conjugates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adoptive cell therapy involves collecting and modifying a patient's own T cells, genetically engineering them to recognize and attack cancer cells, and then re-infusing them into the patient's body.

Multiple choice

Which type of immunotherapy involves the use of oncolytic viruses?

  1. Adoptive cell therapy

  2. Immune checkpoint inhibitors

  3. Virotherapy

  4. Antibody-drug conjugates
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Virotherapy involves the use of oncolytic viruses, which are engineered to selectively infect and kill cancer cells while sparing healthy cells. The viruses replicate within cancer cells, causing their destruction and stimulating an immune response against cancer.

Multiple choice

What is the primary function of adjuvant in vaccine formulation?

  1. To enhance the immunogenicity of the vaccine

  2. To reduce the risk of adverse reactions

  3. To stabilize the vaccine components

  4. To inactivate the pathogen in the vaccine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adjuvants are substances added to vaccines to enhance the immune response. They stimulate the immune system to produce stronger and longer-lasting immunity against the pathogen.

Multiple choice

Which type of vaccine is administered orally?

  1. Inactivated vaccines

  2. Live attenuated vaccines

  3. Toxoid vaccines

  4. Oral vaccines
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oral vaccines are administered through the mouth. They are typically used for diseases that are transmitted through the gastrointestinal tract, such as rotavirus and polio.

Multiple choice

What is the primary function of herd immunity in the context of vaccination?

  1. To protect individuals who cannot be vaccinated

  2. To reduce the overall incidence of a disease in a population

  3. To stimulate the production of antibodies against a pathogen

  4. To prevent the emergence of new strains of a pathogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Herd immunity occurs when a large proportion of a population is vaccinated, creating an indirect protection for individuals who are not vaccinated or cannot be vaccinated due to medical reasons. This reduces the overall incidence of the disease in the population.