Question 1

Which scientist is credited with disproving the theory of spontaneous generation by demonstrating that microorganisms do not arise from nonliving matter in boiled broth, provided the container is properly sealed?

Accepted Answer

Spallanzani

Question 2

Which of the following statements best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus and internal membrane-bound organelles.

Question 3

A bacterial cell is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

The cell will shrink as water moves out.

Question 4

Which of the following is NOT a function of the bacterial capsule?

Accepted Answer

Serves as the site of ATP synthesis

Question 5

Which type of microorganism is classified as a eukaryote, can be unicellular or multicellular, and is known for decomposing organic matter?

Accepted Answer

Fungi

Question 6

During Gram staining, what color does a Gram-negative bacterium appear after the application of safranin?

Accepted Answer

Pink/red

Question 7

Which of the following is a correct description of the function of flagella in bacteria?

Accepted Answer

Flagella are responsible for movement by rotating 360°.

Question 8

Which of the following statements about NAD and FAD is correct?

Accepted Answer

NAD and FAD are electron carriers involved in cellular respiration.

Question 9

A scientist wants to calculate the concentration of viable bacteria in a sample using serial dilution and plating. If 0.1 mL of a $10^{-5}$ dilution yields 50 colonies, what is the concentration of bacteria in the original sample (CFU/mL)?

Accepted Answer

$5 	imes 10^{6}$ CFU/mL

Question 10

Which of the following is true regarding the energy yield from substrate-level phosphorylation and oxidative phosphorylation from one glucose molecule in aerobic respiration?

Accepted Answer

Oxidative phosphorylation produces more ATP than substrate-level phosphorylation.

Question 11

Which physical factor is most likely to inhibit bacterial growth by causing proteins to denature and membranes to become nonfunctional?

Accepted Answer

High temperature

Question 12

Which of the following best describes the role of superoxide dismutase in bacterial cells?

Accepted Answer

It detoxifies superoxide anion ($O_2^-$) by converting it to hydrogen peroxide.

Question 13

Which of the following is a correct statement about Mycoplasma pneumoniae?

Accepted Answer

It is a bacterium that lacks a cell wall.

Question 14

Which of the following is NOT a mechanism by which substances can cross a cell membrane?

Accepted Answer

Protein synthesis

Question 15

Which of the following best describes the function of the slime layer in bacteria?

Accepted Answer

It is a loosely organized glycocalyx that helps bacteria adhere to surfaces.

Question 16

Which scientist is known as the 'Father of Epidemiology' for his work tracing the source of a cholera outbreak in London?

Accepted Answer

John Snow

Question 17

Which of the following is a correct statement about the function of cilia in protozoa?

Accepted Answer

Cilia are numerous, short, hair-like protrusions that propel organisms through their environment.

Question 18

Which of the following is a correct conversion in the metric system?

Accepted Answer

1 cm = 10 mm

Question 19

Which of the following is a property of an isotonic solution when a cell is placed in it?

Accepted Answer

There is no net movement of water across the membrane.

Question 20

Which of the following is a correct statement about the composition of bacterial cell walls?

Accepted Answer

Bacterial cell walls contain peptidoglycan.

Comprehensive Study Guide: Foundations of Microbiology

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