Question 1

Which of the following best describes the function of plasmids in bacterial cells?

Accepted Answer

They often carry genes that confer advantages such as antibiotic resistance.

Question 2

A microbiologist observes a colony on an agar plate and infers that it originated from a single cell. What is the term for this original cell?

Accepted Answer

Colony forming unit (CFU)

Question 3

Which of the following is a property shared by all microbial cells?

Accepted Answer

Metabolism, growth, and evolution

Question 4

A spherical bacterial cell has a radius of $$r = 2\ \mu m. $$What is its surface area to volume ratio?

Accepted Answer

$$1.5$$

Question 5

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotes have mitochondria and Golgi apparatus, while prokaryotes do not.

Question 6

Which of the following best explains why smaller microbial cells can grow and divide faster than larger ones?

Accepted Answer

They have a higher surface area to volume ratio, allowing for more efficient nutrient uptake.

Question 7

Which of the following is NOT a correct match between a microbial structure and its function?

Accepted Answer

Mitochondria – site of DNA replication

Question 8

A scientist is studying a microorganism that thrives at 100°C in deep-sea hydrothermal vents. Which term best describes this organism?

Accepted Answer

Hyperthermophile

Question 9

Which of the following best describes the main conclusion of Pasteur’s swan-necked flask experiment?

Accepted Answer

Sterile liquid remains free of microbial growth unless exposed to pre-existing microorganisms.

Question 10

Which of the following is NOT one of Koch’s postulates for proving the cause of an infectious disease?

Accepted Answer

The suspected pathogen must be able to survive outside the host for at least 24 hours.

Question 11

Which of the following best explains why Gram staining is important in microbiology?

Accepted Answer

It differentiates bacteria based on differences in their cell wall structure.

Question 12

A researcher is using a microscope to observe a sample of bacteria. Which of the following would provide the highest resolution for viewing internal cell structures?

Accepted Answer

Transmission electron microscopy

Question 13

Which of the following is an example of an anabolic pathway in microbial metabolism?

Accepted Answer

Protein synthesis from amino acids

Question 14

A bacterial cell is observed to have a spiral shape. Which term best describes its morphology?

Accepted Answer

Spirillum

Question 15

Which of the following best describes the role of microbes in the nitrogen cycle in agriculture?

Accepted Answer

They fix atmospheric nitrogen into ammonia, making it available to plants.

Question 16

Which of the following is a correct statement about the evolutionary relationships among the three domains of life?

Accepted Answer

Archaea and Eukarya share a more recent common ancestor with each other than with Bacteria.

Question 17

Which of the following is a real-world application of industrial microbiology?

Accepted Answer

Producing antibiotics and enzymes using genetically modified microbes

Question 18

A microbiologist is studying a sample from a hot spring with a pH of 2. Which type of extremophile is most likely to be found in this environment?

Accepted Answer

Acidophile

Question 19

Which of the following best explains the decrease in deaths from infectious diseases in the United States from 1900 to today?

Accepted Answer

Increased use of antibiotics, improved sanitation, and vaccination programs

Question 20

Which of the following best describes the process of fermentation in food production?

Accepted Answer

Conversion of glucose to lactic acid, ethanol, or acetic acid by microbes in the absence of oxygen

Introduction to the Microbial World: Structure, Diversity, and Impact

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