Q: If a scientist wants to calculate the concentration of bacteria in a liquid sample, which formula should they use?

$$CFU\/ml = \frac{\text{Number of colonies}}{\text{Volume plated (ml)}}$$

Question 1

Which scientist is credited with disproving the theory of spontaneous generation by demonstrating that bacteria must come from other bacteria?

Accepted Answer

Louis Pasteur

Question 2

What is the primary function of flagella in bacteria?

Accepted Answer

Long whip-like movement for motility

Question 3

Which of the following is NOT a characteristic required for an organism to be considered living?

Accepted Answer

Ability to photosynthesize

Question 4

A virus is described as acellular and must be viewed with an electron microscope. Which property distinguishes viruses from bacteria?

Accepted Answer

Viruses have a protein coat and lack cellular structure

Question 5

Which process is used to kill bacteria in liquids to prevent food spoilage, as discovered by Pasteur?

Accepted Answer

Pasteurization

Question 6

John Snow is known as the father of epidemiology for his work in stopping which disease outbreak?

Accepted Answer

Cholera

Question 7

Which of the following best describes Koch’s accomplishment in microbiology?

Accepted Answer

He developed methods for isolating and counting bacteria using colony forming units (CFU/ml)

Question 8

Which of the following statements about anti-virulent pathogens is correct?

Accepted Answer

They do not have variance and do not cause sickness in people

Question 9

Which of the following is a correct application of the germ theory of disease?

Accepted Answer

Pathogenic microorganisms are responsible for causing disease

Question 10

A scientist observes that yeast produces alcohol and carbon dioxide when sugar is present. What process is being observed?

Accepted Answer

Fermentation

Question 11

Which of the following statements about viruses is FALSE?

Accepted Answer

Viruses are composed of cells

Question 12

Which tool did Leeuwenhoek use to discover the microbial world, including bacteria and protozoa?

Accepted Answer

Microscope

Question 13

A researcher uses a ceramic filter to separate bacteria from viruses. What property of viruses allows this separation?

Accepted Answer

Viruses are smaller than bacteria

Question 14

Which of the following is an example of an aseptic technique in microbiology?

Accepted Answer

Preventing contamination during experiments

Question 15

If a scientist wants to calculate the concentration of bacteria in a liquid sample, which formula should they use?

Accepted Answer

$$CFU/ml = \frac{	ext{Number of colonies}}{	ext{Volume plated (ml)}}$$

Question 16

Which of the following structures is used by protozoa for movement and is described as a 'fake foot'?

Accepted Answer

Pseudopod

Question 17

A patient is diagnosed with malaria. Which microorganism and structure are involved in the transmission of this disease?

Accepted Answer

Plasmodium species transmitted by mosquitoes

Question 18

Which of the following statements best explains why viruses are considered obligate parasites?

Accepted Answer

They require a host cell to reproduce

Question 19

Which scientist first used a potato slice as a medium to grow bacteria, leading to the development of the Petri dish?

Accepted Answer

Koch

Question 20

A student observes tiny animals, fungi, algae, and single-celled protozoa under a microscope. Who is credited with first discovering these 'beasties'?

Accepted Answer

Antonie van Leeuwenhoek

Foundations of Microbiology: Key Concepts, Discoveries, and Microorganisms

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