Q: Which of the following is the correct formula for calculating the total magnification of a specimen viewed under a compound microscope?

$$\text{Total Magnification} = \text{Objective Lens Magnification} \times \text{Ocular Lens Magnification}$$

Q: Which of the following is the correct definition of a catalyst, and what is the general equation for a catalyzed reaction?

A catalyst speeds up a reaction without being consumed; $$\text{Reactants} + \text{Catalyst} \rightarrow \text{Products} + \text{Catalyst}$$

Question 1

Which of the following scientists is credited with disproving the hypothesis of spontaneous generation using a swan-neck flask experiment?

Accepted Answer

Louis Pasteur

Question 2

A patient develops an infection after surgery that was not present at the time of admission. What is the term for this type of infection?

Accepted Answer

Nosocomial infection

Question 3

Which of the following best describes the function of a buffer in a biological system?

Accepted Answer

To maintain a stable pH by neutralizing acids and bases

Question 4

A scientist observes a microbe with a thick, waxy cell wall that stains pink after an acid-fast stain. Which genus is most likely being observed?

Accepted Answer

Mycobacterium

Question 5

Which of the following best explains why Gram-negative bacteria are less susceptible to penicillin than Gram-positive bacteria?

Accepted Answer

They have an outer membrane that restricts entry of penicillin

Question 6

Which of the following is the correct formula for calculating the total magnification of a specimen viewed under a compound microscope?

Accepted Answer

$$	ext{Total Magnification} = 	ext{Objective Lens Magnification} 	imes 	ext{Ocular Lens Magnification}$$

Question 7

Which of the following best describes the relationship between humans and their normal microbiota?

Accepted Answer

Mutualism and commensalism

Question 8

A researcher is studying a molecule that has both hydrophobic and hydrophilic regions. What is the term for this type of molecule, and which of the following is an example?

Accepted Answer

Amphipathic; phospholipid

Question 9

Which scientist is credited with the discovery of penicillin, the first true antibiotic?

Accepted Answer

Alexander Fleming

Question 10

Which of the following best describes the function of ribosomes in both prokaryotic and eukaryotic cells?

Accepted Answer

Protein synthesis

Question 11

A bacterial cell is placed in a solution with a lower solute concentration than the cytoplasm. What process will occur, and what is the direction of water movement?

Accepted Answer

Osmosis; water moves into the cell

Question 12

Which of the following is NOT a characteristic of prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 13

Which of the following best describes the main function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Modification, sorting, and packaging of proteins and lipids

Question 14

A scientist is using the streak plate technique. What is the primary goal of this method?

Accepted Answer

To isolate pure colonies from a mixed culture

Question 15

Which of the following best explains why immersion oil is used with the 100x objective lens in light microscopy?

Accepted Answer

It increases the numerical aperture by reducing light refraction

Question 16

Which of the following is the correct definition of a catalyst, and what is the general equation for a catalyzed reaction?

Accepted Answer

A catalyst speeds up a reaction without being consumed; $$	ext{Reactants} + 	ext{Catalyst} ightarrow 	ext{Products} + 	ext{Catalyst}$$

Question 17

Which of the following best describes the difference between dehydration synthesis and hydrolysis reactions?

Accepted Answer

Dehydration synthesis joins monomers by removing water; hydrolysis breaks polymers by adding water

Question 18

Which of the following is a correct example of binomial nomenclature, and who developed this system?

Accepted Answer

Escherichia coli; Carl Linnaeus

Question 19

Which of the following best describes the function of bacterial capsules in pathogenicity?

Accepted Answer

They help bacteria evade phagocytosis and adhere to surfaces

Question 20

A patient is diagnosed with a fungal infection called tinea pedis. Which of the following is a common name for this infection, and what is the most common genus that causes it?

Accepted Answer

Athlete's foot; Trichophyton

Comprehensive Study Guide for College Microbiology: Chapters 1-4

Study Guide - Practice Questions

Study Guide - Flashcards