Question 1

Which of the following scientists is correctly matched with their major contribution to microbiology?

Accepted Answer

Ignaz Semmelweis – Advocated handwashing to prevent puerperal fever

Question 2

Which experiment provided the most convincing evidence against the theory of spontaneous generation?

Accepted Answer

Louis Pasteur's swan-neck flask experiment

Question 3

A patient is diagnosed with tuberculosis. Which staining technique would be most useful for identifying the causative agent, and why?

Accepted Answer

Acid-fast stain, because Mycobacterium has a waxy cell wall that retains carbol fuchsin

Question 4

Which of the following best describes the difference between a bacterial endospore and a fungal spore?

Accepted Answer

Bacterial endospores are for survival under harsh conditions, while fungal spores are primarily for reproduction

Question 5

A microbiologist is using a compound light microscope with a 10x ocular lens and a 40x objective lens. What is the total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Question 6

Which of the following best explains why oil is used with the oil immersion lens in light microscopy?

Accepted Answer

Oil increases the refractive index, reducing light refraction and improving resolution

Question 7

Which of the following is a correct statement about the Gram stain procedure?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet-iodine complex

Question 8

Which of the following best describes mutualism in the context of human-microbe interactions?

Accepted Answer

Both the human host and the microbe benefit from the relationship

Question 9

A hospital patient develops a persistent infection on a catheter. Which microbial phenomenon is most likely responsible, and why is it difficult to treat?

Accepted Answer

Biofilm formation; biofilms protect microbes from antibiotics and immune responses

Question 10

Which of the following is NOT a correct pairing of macromolecule and its monomer?

Accepted Answer

Lipid – Nucleotide

Question 11

Which chemical reaction is responsible for joining two monosaccharides to form a disaccharide, and what is released during this process?

Accepted Answer

Dehydration synthesis; water is released

Question 12

A bacterial cell is placed in a hypertonic solution. Predict the outcome based on osmosis.

Accepted Answer

Water will leave the cell, causing it to shrink (plasmolysis)

Question 13

Which of the following best describes the endosymbiotic theory for the origin of mitochondria?

Accepted Answer

Mitochondria are remnants of ancient prokaryotic cells that were engulfed and became symbiotic within eukaryotic cells

Question 14

Which of the following is a distinguishing feature of archaea compared to bacteria?

Accepted Answer

Archaea have unique membrane lipids and lack peptidoglycan

Question 15

Which of the following is the correct way to write the scientific name for the bacterium that causes anthrax?

Accepted Answer

Bacillus anthracis (italicized or underlined)

Question 16

Which of the following best describes the function of bacterial pili?

Accepted Answer

Attachment to surfaces and DNA transfer during conjugation

Question 17

Which of the following is a correct sequence in the taxonomic hierarchy from most inclusive to least inclusive?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 18

Which of the following is NOT a best practice for aseptic technique in the microbiology lab?

Accepted Answer

Leaving petri plates open to the air for extended periods

Question 19

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modification, sorting, and packaging of proteins and lipids

Question 20

A student is asked to streak an agar plate for isolation. Which of the following best describes the purpose of this technique?

Accepted Answer

To obtain isolated colonies from a mixed culture

Microbiology Study Guide: Foundations (Chapters 1–4 & Lab Essentials)

Study Guide - Practice Questions

Study Guide - Flashcards