Q: Which equation best represents the process of lactic acid fermentation performed by lactic acid bacteria?

$$\text{C}_6\text{H}_{12}\text{O}_6 \rightarrow 2\text{CH}_3\text{CH}(\text{OH})\text{COOH}$$

Question 1

Which of the following statements best explains why microbiologists group bacteria, archaea, algae, fungi, protozoa, and viruses together, despite their differences?

Accepted Answer

They are all microorganisms, meaning they are too small to be seen without a microscope.

Question 2

Which of the following is TRUE regarding viruses?

Accepted Answer

Viruses are acellular and not made of cells.

Question 3

A patient with AIDS develops Pneumocystis pneumonia. This is best described as:

Accepted Answer

An opportunistic infectious disease caused by a fungus.

Question 4

Which of the following is a benefit provided by resident microbiota through mutualism?

Accepted Answer

Synthesis of vitamin K and some B vitamins utilized by the human host.

Question 5

Which of the following is NOT a characteristic of bacteria?

Accepted Answer

They are eukaryotic.

Question 6

A scientist observes a microorganism with pseudopodia. Which subgroup does this organism most likely belong to?

Accepted Answer

Protozoa

Question 7

Which of the following is an example of a chemical barrier in innate immunity?

Accepted Answer

Hydrochloric acid secreted by the stomach

Question 8

Which equation best represents the process of lactic acid fermentation performed by lactic acid bacteria?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 ightarrow 2	ext{CH}_3	ext{CH}(	ext{OH})	ext{COOH}$$

Question 9

Which of the following best describes the function of pyrogen in fever development?

Accepted Answer

Pyrogen resets the hypothalamic thermostat to a higher setting.

Question 10

Which of the following is an example of an exogenous pyrogen?

Accepted Answer

Toxins released by pathogenic intruders

Question 11

Which of the following is a plausible reason why zoonoses are difficult to control?

Accepted Answer

Animal reservoirs are widespread and often asymptomatic, making it hard to eliminate the source.

Question 12

Which of the following is a correct example of a communicable infectious disease?

Accepted Answer

Influenza

Question 13

Which of the following best describes the role of lysozyme in innate immunity?

Accepted Answer

Lysozyme digests bacterial cell walls, providing a chemical barrier.

Question 14

Which of the following is a plausible mechanism by which a pathogen evades phagocytosis?

Accepted Answer

By forming a slippery capsule around itself.

Question 15

Which of the following is TRUE about Koch’s postulates?

Accepted Answer

They demonstrate that a specific microorganism causes a specific disease.

Question 16

Which of the following is an example of a mechanical barrier in innate immunity?

Accepted Answer

Mucociliary movement in the respiratory tract

Question 17

Which of the following equations best represents alcohol fermentation performed by yeast?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 ightarrow 2	ext{C}_2	ext{H}_5	ext{OH} + 2	ext{CO}_2$$

Question 18

Which of the following is a correct example of a chronic carrier as a human reservoir?

Accepted Answer

A person who has recovered from hepatitis B but still harbors the virus.

Question 19

Which of the following is a plausible benefit of vascular changes during inflammation?

Accepted Answer

They increase the permeability of blood vessels, allowing immune cells to reach the site of infection.

Question 20

Which of the following is an example of an infectious disease caused by pathogenic bacteria that produce exotoxin?

Accepted Answer

Tetanus

Microbiology Exam 1 Study Guide: Introduction, Infection, and Innate Immunity

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