Question 1

Which of the following best describes the main structural difference between bacteria and viruses?

Accepted Answer

Bacteria have a rigid cell wall and plasma membrane, while viruses consist of genetic material surrounded by a protein coat.

Question 2

Which of the following is NOT a factor used to determine how dangerous a pathogen is?

Accepted Answer

Incubation period

Question 3

A patient develops a neurological disorder after eating beef from cattle infected with BSE. Which type of pathogen is most likely responsible?

Accepted Answer

Prion

Question 4

Which of the following best explains why antibiotics are ineffective against viral infections?

Accepted Answer

Viruses lack the cellular structures targeted by antibiotics.

Question 5

Which of the following diseases is caused by a prion?

Accepted Answer

Variant Creutzfeldt-Jakob disease (vCJD)

Question 6

A spiral-shaped bacterium is observed under a microscope. Which disease could this bacterium most likely cause?

Accepted Answer

Food poisoning

Question 7

Which of the following best describes how prions cause disease?

Accepted Answer

They induce misfolding of normal neural proteins, leading to cell death.

Question 8

Which of the following is a correct sequence for how a virus infects a host cell?

Accepted Answer

Attachment to cell membrane, injection of genetic material, host cell produces viral copies.

Question 9

Which of the following statements about prions is TRUE?

Accepted Answer

Prions are resistant to cooking, drying, and freezing.

Question 10

A new pathogen is discovered that is highly transmissible, spreads through airborne droplets, and causes severe tissue damage. According to the three factors of pathogen danger, how would you classify this pathogen?

Accepted Answer

Highly dangerous due to high transmissibility, airborne mode of transmission, and high virulence.

Question 11

Which of the following best describes the role of the immune system in defending against pathogens?

Accepted Answer

It uses a combination of cells, proteins, and lymphatic structures to recognize and eliminate pathogens.

Question 12

Which of the following is a common misconception about bacteria?

Accepted Answer

All bacteria are harmful and cause disease.

Question 13

A patient is diagnosed with pneumonia. Which type of pathogen is most likely responsible, and what is the typical treatment?

Accepted Answer

Bacterium; treated with antibiotics.

Question 14

Which of the following equations best represents the relationship between surface area (SA) and volume (V) for a spherical bacterium, and why is this relationship important?

Accepted Answer

$$SA = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$; a high surface-to-volume ratio allows efficient exchange of materials and wastes.$

Question 15

Which of the following best explains why prion diseases are difficult to control in the food supply?

Accepted Answer

Prions are resistant to standard food preparation methods such as cooking and freezing.

Question 16

Which of the following is a real-world example of a disease caused by a virus?

Accepted Answer

Chicken pox

Question 17

A scientist is studying a pathogen that consists only of a protein coat and RNA. Which type of pathogen is this?

Accepted Answer

Virus

Question 18

Which of the following best describes the process by which a virus replicates inside a host cell?

Accepted Answer

The host cell produces thousands of copies of the viral genetic material instead of its own.

Question 19

Which of the following is the best strategy to prevent prion diseases in humans?

Accepted Answer

Limiting the spread of BSE in cattle populations.

Question 20

Which of the following is a distinguishing feature of prokaryotic cells such as bacteria?

Accepted Answer

They lack a membrane-bound nucleus.

Pathogenic Organisms and Their Impact on Human Health

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