Q: Which equation best represents the process by which mRNA vaccines induce an immune response?

$$\text{mRNA} \xrightarrow{\text{translation}} \text{Viral Protein} \xrightarrow{\text{APC presentation}} \text{Immune Response}$$

Question 1

Which of the following best describes the principle of herd immunity?

Accepted Answer

Immunity in most of the population, reducing the likelihood of disease outbreaks due to a lack of susceptible individuals.

Question 2

Which type of vaccine is most likely to confer lifelong immunity and why?

Accepted Answer

Attenuated vaccines, because the weakened pathogen replicates in the body, stimulating both humoral and cellular immunity.

Question 3

A 2-month-old infant is scheduled to receive a vaccine against Haemophilus influenzae type b. Which vaccine type is most appropriate and why?

Accepted Answer

Conjugated vaccine, because infants do not respond well to T-independent antigens like capsular polysaccharides.

Question 4

Which of the following statements about mRNA vaccines is CORRECT?

Accepted Answer

They use lipid nanoparticles to deliver mRNA encoding a viral antigen, which is then translated into protein by host cells.

Question 5

Which of the following is a potential risk associated with live attenuated vaccines?

Accepted Answer

The pathogen may revert to a virulent form and cause disease.

Question 6

A patient is given a vaccine containing inactivated tetanus toxin. What type of vaccine is this, and what is its main mechanism of action?

Accepted Answer

Toxoid vaccine; it induces immunity by stimulating antibody production against the inactivated toxin.

Question 7

Which of the following best explains why oral vaccines are favored for pathogens that enter through the gastrointestinal tract?

Accepted Answer

They stimulate mucosal immunity at the site of pathogen entry.

Question 8

A new vaccine is developed using a recombinant virus that expresses a gene from a pathogenic virus. What type of vaccine is this?

Accepted Answer

Recombinant vector vaccine

Question 9

Which of the following statements about monoclonal antibodies (Mabs) is TRUE?

Accepted Answer

They are produced by hybridomas, which are fusions of myeloma cells and antibody-producing B cells.

Question 10

Which equation best represents the process by which mRNA vaccines induce an immune response?

Accepted Answer

$$	ext{mRNA} \xrightarrow{	ext{translation}} 	ext{Viral Protein} \xrightarrow{	ext{APC presentation}} 	ext{Immune Response}$$

Question 11

Why are adjuvants such as alum or monophosphoryl lipid A added to some vaccines?

Accepted Answer

To enhance the innate immune response and improve vaccine effectiveness.

Question 12

Which of the following is a major reason why some vaccine-preventable diseases persist in certain regions?

Accepted Answer

Lower rates of vaccination due to poverty and lack of health infrastructure.

Question 13

A patient receives a vaccine containing purified polysaccharide from Streptococcus pneumoniae. Which statement is TRUE regarding this vaccine?

Accepted Answer

It is not very immunogenic in children under 2 years old.

Question 14

Which of the following best explains why conjugated vaccines are effective in infants?

Accepted Answer

They attach a polysaccharide antigen to a protein carrier, making the vaccine immunogenic in young children.

Question 15

Which of the following is a correct statement about the use of monoclonal antibodies in therapy?

Accepted Answer

They are used to treat diseases such as multiple sclerosis, Crohn’s disease, and COVID-19.

Question 16

Which of the following is a disadvantage of inactivated (killed) vaccines compared to live attenuated vaccines?

Accepted Answer

They require repeated booster doses to maintain immunity.

Question 17

Which of the following best describes the process of producing monoclonal antibodies?

Accepted Answer

Fusion of a myeloma cell with an antibody-producing B cell to create a hybridoma.

Question 18

Which of the following vaccines is recommended annually for all individuals over 6 months of age?

Accepted Answer

Influenza vaccine

Question 19

Which of the following equations best represents the process by which DNA vaccines induce immunity?

Accepted Answer

$$	ext{DNA} \xrightarrow{	ext{transcription}} 	ext{mRNA} \xrightarrow{	ext{translation}} 	ext{Protein Antigen} \xrightarrow{	ext{Immune Activation}} 	ext{Immunity}$$

Practical Applications of Immunology: Vaccines and Monoclonal Antibodies

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