Question 1

Which of the following best describes a eukaryotic microorganism?

Accepted Answer

An organism with a nucleus and membrane-bound organelles

Question 2

Which of the following is NOT considered a microorganism?

Accepted Answer

Plants

Question 3

Which statement best explains why viruses are not classified as living organisms?

Accepted Answer

They do not have a cellular structure and cannot reproduce independently

Question 4

Which of the following is a correct example of a prokaryotic microorganism?

Accepted Answer

Bacillus subtilis

Question 5

Which of the following is a function of the bacterial cell wall?

Accepted Answer

Protection against osmotic pressure

Question 6

Which method is most appropriate for sterilizing heat-sensitive medical equipment?

Accepted Answer

Filtration using a $$0.22\ \mu\mathrm{m}$$ membrane

Question 7

Which of the following best describes the Gram stain technique?

Accepted Answer

A method to differentiate bacteria based on cell wall composition

Question 8

Which of the following is a key difference between bacteria and archaea?

Accepted Answer

Bacteria have ester-linked membrane lipids, while archaea have ether-linked membrane lipids

Question 9

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They reproduce independently outside host cells

Question 10

Which of the following statements about fungi is correct?

Accepted Answer

Fungi can be both unicellular (yeasts) and multicellular (molds)

Question 11

A patient presents with a fever and cough. Laboratory tests reveal the presence of a microorganism that lacks a cell wall and is sensitive to osmotic pressure. Which type of microorganism is most likely responsible?

Accepted Answer

Mycoplasma

Question 12

Which of the following is the best method to enumerate viable bacteria in a sample?

Accepted Answer

Serial dilution and plate count

Question 13

Which of the following is a chemical method of microbial control?

Accepted Answer

Use of phenol

Question 14

Which macromolecule is most abundant in the bacterial cell wall?

Accepted Answer

Peptidoglycan

Question 15

Which of the following statements about sterilization is correct?

Accepted Answer

Sterilization eliminates all forms of microbial life, including spores

Question 16

A laboratory technician needs to sterilize a solution that cannot be heated. Which method should be used?

Accepted Answer

Filtration through a $$0.22\ \mu\mathrm{m}$$ membrane

Question 17

Which of the following is a limitation of using UV radiation for sterilization?

Accepted Answer

It cannot penetrate surfaces or liquids

Question 18

Which of the following best describes the role of enzymes in microbial metabolism?

Accepted Answer

Enzymes act as biological catalysts to speed up chemical reactions

Question 19

Which of the following is the correct order of steps in the Gram stain procedure?

Accepted Answer

Crystal violet, iodine, alcohol, safranin

Question 20

A sample contains both Gram-positive and Gram-negative bacteria. After Gram staining, what color will the Gram-negative bacteria appear under the microscope?

Accepted Answer

Pink/red

Microbiology Exam Study Guide: Lecture 5 – Viruses, Bacteriophages, and Viral Classification

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