Question 1

Which of the following best describes variolation, and how does it differ from Edward Jenner's smallpox vaccination?

Accepted Answer

Variolation involved exposing individuals to material from smallpox lesions, whereas Jenner's vaccination used cowpox virus to induce immunity.

Question 2

Which principle underlies the effectiveness of most vaccines?

Accepted Answer

Vaccines introduce antigens that stimulate the adaptive immune system to produce memory cells.

Question 3

Which of the following is a key advantage of attenuated vaccines compared to inactivated vaccines?

Accepted Answer

Attenuated vaccines can replicate in the host, providing longer-lasting immunity.

Question 4

A patient receives a subunit vaccine for hepatitis B. Which of the following best describes a subunit vaccine?

Accepted Answer

It contains only specific antigens from the pathogen, not the whole organism.

Question 5

Which of the following is a disadvantage of inactivated vaccines?

Accepted Answer

They often require multiple doses to achieve effective immunity.

Question 6

Which laboratory technique is commonly used to determine blood type by detecting antigen-antibody reactions?

Accepted Answer

Agglutination assay

Question 7

A scientist wants to detect the presence of HIV antibodies in a patient's serum. Which test should they use?

Accepted Answer

ELISA (Enzyme-Linked Immunosorbent Assay)

Question 8

Which of the following best describes the principle of the ELISA test?

Accepted Answer

It uses antigen-antibody binding and an enzyme-linked indicator to produce a measurable color change.

Question 9

Which formula correctly represents the amplification of DNA during PCR after $n$ cycles, starting with one copy?

Accepted Answer

$2^n$

Question 10

A forensic scientist needs to amplify a small amount of DNA from a crime scene. Which technique should they use?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 11

Which of the following is a correct application of PCR in medical diagnostics?

Accepted Answer

Detecting the presence of specific viral DNA in patient samples

Question 12

Which method is commonly used to create recombinant DNA constructs for gene therapy?

Accepted Answer

Restriction enzymes and DNA ligase are used to insert a gene into a plasmid vector.

Question 13

Which of the following is a major difference between direct and indirect ELISA methods?

Accepted Answer

Direct ELISA detects antigens, while indirect ELISA detects antibodies.

Question 14

A patient is suspected of having an autoimmune disease. Which laboratory test would best help confirm the presence of autoantibodies?

Accepted Answer

Indirect ELISA

Question 15

Which of the following is a critical step in the process of making recombinant DNA?

Accepted Answer

Cutting DNA at specific sequences using restriction enzymes

Question 16

In a real-world scenario, why is it important to use controls in an ELISA test?

Accepted Answer

Controls help ensure the accuracy and reliability of the test results by identifying false positives and negatives.

Question 17

Which of the following scenarios best illustrates the use of agglutination reactions in clinical diagnostics?

Accepted Answer

Determining a patient's blood type by mixing blood with specific antibodies and observing clumping

Question 18

A researcher wants to compare the effectiveness of two different vaccines. Which experimental design would best allow for this comparison?

Accepted Answer

Randomized controlled trial with two groups receiving different vaccines

Question 19

Which of the following is a potential disadvantage of using recombinant DNA technology in medicine?

Accepted Answer

It may introduce unintended genetic changes or immune responses in patients.

Question 20

Which equation best represents the relationship between the number of DNA molecules after $n$ cycles of PCR, starting with $N_0$ molecules?

Accepted Answer

$N = N_0 	imes 2^n$

Chapter 14: Biomedical Applications – Vaccines, Diagnostics, Therapeutics, and Molecular Methods (Homework Questions Study Guide)

Study Guide - Practice Questions