Question 1

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

Accepted Answer

They allow bacteria to survive harsh environmental conditions by entering a dormant state.

Question 2

A scientist isolates a bacterium with a thick peptidoglycan layer and teichoic acids in its cell wall, but no outer membrane. Which type of cell wall does this bacterium have?

Accepted Answer

Gram-positive

Question 3

Which of the following is a correct scientific name, following the rules of binomial nomenclature?

Accepted Answer

Escherichia coli

Question 4

Which scientist is credited with developing a set of postulates to establish a causative relationship between a microbe and a disease?

Accepted Answer

Koch

Question 5

A patient is diagnosed with tuberculosis. Which unique component in the cell wall of the causative agent helps it resist desiccation and many disinfectants?

Accepted Answer

Mycolic acid

Question 6

Which of the following best explains the endosymbiotic theory?

Accepted Answer

Eukaryotic organelles such as mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 7

Which of the following is NOT a characteristic of all living things?

Accepted Answer

Ability to form endospores

Question 8

A virus with a single-stranded RNA genome and an envelope infects a human cell. Which of the following structures is NOT found in this virus?

Accepted Answer

70S ribosomes

Question 9

Which of the following best describes the lytic cycle of a bacteriophage?

Accepted Answer

The phage replicates inside the host cell and causes cell lysis, releasing new phages.

Question 10

Which enzyme allows aerobic bacteria to neutralize hydrogen peroxide, a toxic byproduct of oxygen metabolism?

Accepted Answer

Catalase

Question 11

A microbiologist observes a chain of spherical bacteria under the microscope. What is the correct term for this arrangement and shape?

Accepted Answer

Streptococcus

Question 12

Which of the following is a distinguishing feature of Gram-negative bacteria?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharide (LPS)

Question 13

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

Accepted Answer

Protein synthesis

Question 14

Which of the following eukaryotic organelles is most directly involved in the synthesis and modification of proteins for export?

Accepted Answer

Golgi apparatus

Question 15

A patient presents with a fungal infection. Which of the following characteristics is unique to fungi among eukaryotic microbes?

Accepted Answer

Cell walls containing chitin

Question 16

Which of the following best describes a prion?

Accepted Answer

An infectious protein that lacks nucleic acids

Question 17

Which of the following best explains why mitochondria and chloroplasts are considered evidence for the endosymbiotic theory?

Accepted Answer

They contain their own circular DNA and 70S ribosomes, similar to prokaryotes.

Question 18

A bacterium is classified as an obligate anaerobe. Which of the following statements is true about its metabolism?

Accepted Answer

It cannot survive in the presence of oxygen because it lacks enzymes such as superoxide dismutase and catalase.

Question 19

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

Accepted Answer

Prokaryotic ribosomes are 70S, while eukaryotic ribosomes are 80S.

Question 20

A virus is cultivated in a laboratory using a bacterial culture. What is the most likely type of virus being studied?

Accepted Answer

Bacteriophage

Unit 1 Study Guide: Microbiology Fundamentals (Chapters 1, 3, 4, 5, 6)

Study Guide - Practice Questions

Study Guide - Flashcards