Q: A bacterial cell divides every 30 minutes. If you start with one cell, how many cells will there be after 2 hours? Use the formula $$N = N_0$ \times 2$$^{n}$$, where N_0$ is the initial number of cells and n$ is the number of generations.

$$N = 1 \times 2$$^{4}$$ = 16$$

Question 1

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

Accepted Answer

Bacteria are prokaryotic cells that can reproduce independently, while viruses require a host cell to replicate.

Question 2

A scientist isolates a microorganism that lacks a nucleus, contains peptidoglycan in its cell wall, and is approximately $$0.2\ \mu m in $$diameter. To which domain does this organism most likely belong?

Accepted Answer

Domain Bacteria

Question 3

Which of the following is NOT a correct practice when handling bacterial cultures using aseptic technique?

Accepted Answer

Leaving culture plates uncovered while preparing media.

Question 4

A bacterial colony is described as having a round form, raised elevation, smooth margin, and yellow color. Which aspect of characterization is being described?

Accepted Answer

Colony morphology

Question 5

Which of the following genera is correctly matched with its bacterial shape?

Accepted Answer

Vibrio – comma-shaped rod

Question 6

A patient sample is found to contain Gram-negative, coccus-shaped bacteria. Which organism is most likely present?

Accepted Answer

Neisseria gonorrhoeae

Question 7

Which of the following best explains why bacteria are considered ubiquitous?

Accepted Answer

They are present in almost every environment, including air, soil, and water.

Question 8

Which of the following is a correct example of binomial nomenclature for a bacterium?

Accepted Answer

Streptococcus pneumoniae

Question 9

A bacterial cell divides every 30 minutes. If you start with one cell, how many cells will there be after 2 hours? Use the formula $$N = N_0$ 	imes 2$$^{n}$$, where N_0$ is the initial number of cells and n$ is the number of generations.

Accepted Answer

$$N = 1 	imes 2$$^{4}$$ = 16$$

Question 10

Which of the following statements about Gram staining is correct?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer and appear purple.

Question 11

Which of the following best describes the shape and arrangement of Staphylococcus aureus as seen under the microscope?

Accepted Answer

Spherical, arranged in clusters

Question 12

Which of the following environments would you expect to be free of bacteria?

Accepted Answer

Sterilized surgical instruments

Question 13

A student observes a bacterial sample under 1000X magnification and notes spiral-shaped cells. Which genus is most likely being observed?

Accepted Answer

Borrelia

Question 14

Which of the following is a key feature that distinguishes bacteria from eukaryotes?

Accepted Answer

Lack of a defined nucleus

Question 15

Which of the following best describes binary fission?

Accepted Answer

A process where a bacterial cell divides into two identical daughter cells

Question 16

Which of the following is NOT a component used to describe colony morphology?

Accepted Answer

Gram stain reaction

Question 17

A laboratory technician finds that after 24 hours of incubation, a single bacterial cell has formed a visible colony on an agar plate. What does this observation demonstrate?

Accepted Answer

Bacteria replicate rapidly through binary fission.

Question 18

Which of the following is the correct order of taxonomic hierarchy from broadest to most specific?

Accepted Answer

Domain, Kingdom, Genus, Species

Question 19

Which of the following statements about normal flora is correct?

Accepted Answer

Normal flora are microorganisms that live on and in our bodies without causing harm.

Question 20

Which of the following best describes the shape of Bacillus subtilis?

Accepted Answer

Bacillus (rod-shaped)

Introduction to Bacteria: Structure, Classification, and Morphology

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