Question 1

Which scientist is credited with disproving spontaneous generation by demonstrating that maggots come from flies, not meat?

Accepted Answer

Francesco Redi

Question 2

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

Accepted Answer

Prokaryotic cells lack a nucleus and membrane-bound organelles.

Question 3

A Gram-negative bacterium is stained using the Gram stain procedure. What color will it appear under the microscope, and why?

Accepted Answer

Pink, because it has a thin peptidoglycan layer and an outer membrane.

Question 4

Which of the following statements about Koch’s postulates is CORRECT?

Accepted Answer

They are used to link a specific microorganism to a specific disease.

Question 5

Which of the following best explains why penicillin is more effective against Gram-positive bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that penicillin targets.

Question 6

Which of the following is a correct application of the Endosymbiotic Theory?

Accepted Answer

Mitochondria and chloroplasts originated from engulfed prokaryotic cells.

Question 7

A student observes a cell under a microscope and notes the presence of chitin in its cell wall. Which type of microorganism is this most likely to be?

Accepted Answer

Fungus

Question 8

Which of the following best describes the function of a bacterial capsule?

Accepted Answer

It protects bacteria from phagocytosis and desiccation.

Question 9

Which of the following best describes the difference between simple diffusion and facilitated diffusion across a cell membrane?

Accepted Answer

Facilitated diffusion requires a protein channel, simple diffusion does not.

Question 10

Which of the following is a correct statement about the Gram stain procedure?

Accepted Answer

Crystal violet is the primary stain, and safranin is the counterstain.

Question 11

A microbiologist wants to observe live, unstained cells with high contrast. Which type of microscope should they use?

Accepted Answer

Phase contrast microscope

Question 12

Which of the following best describes the function of bacterial flagella?

Accepted Answer

Motility through rotation

Question 13

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

Accepted Answer

Escherichia coli

Question 14

Which of the following statements about endospores is TRUE?

Accepted Answer

Endospores are highly resistant structures formed by bacteria to survive harsh conditions.

Question 15

Which of the following best describes the difference between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Question 16

Which of the following is a correct description of osmosis?

Accepted Answer

Movement of water from high to low concentration across a selectively permeable membrane.

Question 17

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

Accepted Answer

Protection against osmotic lysis

Question 18

Which of the following best explains why acid-fast staining is used?

Accepted Answer

To identify bacteria with waxy cell walls containing mycolic acid

Question 19

Which of the following is a correct statement about the function of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria are the site of ATP production through cellular respiration.

Question 20

Which of the following best describes the role of a mordant in staining?

Accepted Answer

It increases the affinity of a dye for a specimen.

Microbiology Study Notes: The Microbial World, Microscopy, and Cell Structure

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