Ch. 14 - Biomedical Applications: Vaccines, Diagnostics, Therapeutics, and Molecular Method

Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition

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Norman-McKay 2nd Edition

Ch. 14 - Biomedical Applications: Vaccines, Diagnostics, Therapeutics, and Molecular Method

Problem 11

Chapter 14, Problem 11

Select the true statements about mRNA vaccines. Select all that apply.
a. These vaccines contain a type of nucleic acid
b. These vaccines can alter cellular DNA
c. These vaccines often require a booster dose
d. These vaccines do not require adjuvants
e. These vaccines require an engineered virus to deliver the mRNA to a target cell

Verified step by step guidance

Step 1: Understand what mRNA vaccines are. mRNA vaccines use messenger RNA, a type of nucleic acid, to instruct cells to produce a protein that triggers an immune response. This relates directly to option (a).

Step 2: Evaluate whether mRNA vaccines can alter cellular DNA. Since mRNA operates in the cytoplasm and does not enter the nucleus where DNA resides, it cannot integrate or alter the host's DNA, addressing option (b).

Step 3: Consider the dosing requirements of mRNA vaccines. Many mRNA vaccines require booster doses to maintain or enhance immunity over time, which relates to option (c).

Step 4: Analyze the need for adjuvants in mRNA vaccines. Unlike some traditional vaccines, mRNA vaccines typically do not require adjuvants because the mRNA itself stimulates a strong immune response, relevant to option (d).

Step 5: Assess the delivery mechanism of mRNA vaccines. mRNA vaccines use lipid nanoparticles, not engineered viruses, to deliver mRNA into cells, so option (e) is incorrect.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

mRNA Vaccine Composition

mRNA vaccines contain messenger RNA, a type of nucleic acid that encodes the antigen protein. This mRNA instructs cells to produce the antigen, triggering an immune response without using live virus particles.

Mechanism of mRNA Vaccines and DNA Interaction

mRNA vaccines do not integrate into or alter the recipient's DNA because mRNA operates in the cytoplasm and is transient. It is degraded after protein synthesis, ensuring no changes to the cellular genome.

Vaccine Delivery and Booster Requirements

mRNA vaccines typically use lipid nanoparticles, not engineered viruses, to deliver mRNA into cells. They often require booster doses to maintain immunity, and unlike traditional vaccines, they usually do not need adjuvants to enhance immune response.

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