Question 1

Which of the following statements best describes the Central Dogma of Molecular Biology?

Accepted Answer

Genetic information flows from DNA to RNA to protein.

Question 2

Carl Woese’s three-domain system is based primarily on the comparison of which molecular component?

Accepted Answer

16S ribosomal RNA gene sequences

Question 3

Which of the following is a unique characteristic of Archaea compared to Bacteria?

Accepted Answer

Ability to generate methane as a metabolic byproduct

Question 4

Which of the following best explains why Koch’s postulates cannot always be applied to identify the causative agent of a disease?

Accepted Answer

Some microorganisms cannot be grown in pure culture.

Question 5

Which of the following is NOT a function of ribosomes?

Accepted Answer

Replication of DNA

Question 6

Which of the following best describes the RNA World Hypothesis?

Accepted Answer

RNA molecules were the earliest biological molecules capable of storing, copying, and expressing genetic information.

Question 7

Which of the following is an example of an acellular infectious agent composed only of RNA?

Accepted Answer

Viroid

Question 8

Which of the following historical experiments provided the final blow to the theory of spontaneous generation?

Accepted Answer

Pasteur’s swan-neck flask experiment

Question 9

Which of the following best describes the process of endosymbiosis in the evolution of eukaryotic organelles?

Accepted Answer

A eukaryotic cell engulfed a prokaryote, which then evolved into an organelle such as a mitochondrion or chloroplast.

Question 10

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

Accepted Answer

Homo sapiens

Question 11

Which of the following is a plausible reason why viruses are not classified as living organisms?

Accepted Answer

They lack the ability to reproduce independently outside a host cell.

Question 12

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the unique set of genes, while phenotype is the observable traits and functions.

Question 13

Which of the following is a major contribution of Joseph Lister to microbiology?

Accepted Answer

Development of antiseptic surgery techniques

Question 14

Which of the following is a correct statement about the structure of prokaryotic cells?

Accepted Answer

They lack a membrane-bound nucleus.

Question 15

Which of the following is a real-world application of enrichment cultures and selective media, as pioneered by Winogradsky and Beijerinck?

Accepted Answer

Isolating nitrogen-fixing bacteria from soil samples

Question 16

Which of the following best explains why the energy currency of modern cells (ATP) supports the RNA World Hypothesis?

Accepted Answer

ATP is a ribonucleotide, suggesting an ancient role for RNA in metabolism.

Question 17

Which of the following is a limitation of using animal models to fulfill Koch’s postulates for human-specific diseases?

Accepted Answer

Some pathogens only infect humans and do not cause disease in animals.

Question 18

Which of the following is a correct sequence for the flow of genetic information according to the Central Dogma?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 19

Which of the following is a correct description of a microbial strain?

Accepted Answer

A population of microbes descended from a single pure culture that may differ biochemically or morphologically.

Question 20

Which of the following is a major field of applied microbiology?

Accepted Answer

Food microbiology, which studies microbes used in food production and spoilage.

Introduction and History of Microbiology: Study Notes for College Students

Study Guide - Practice Questions