Question 1

Which of the following best describes the significance of Carl Woese and George Fox's discovery in microbiology?

Accepted Answer

They revealed that Archaea constitute a distinct domain of life, separate from Bacteria and Eukarya, based on ribosomal RNA analysis.

Question 2

Which structural feature is unique to prokaryotic cells and distinguishes them from eukaryotic cells?

Accepted Answer

Cell wall composed of peptidoglycan (in most bacteria)

Question 3

A scientist observes a prokaryotic cell that is spherical in shape. Which term best describes this cell shape?

Accepted Answer

Coccus

Question 4

Binary fission in prokaryotes is best described as:

Accepted Answer

An asexual process where a single cell divides into two genetically identical daughter cells.

Question 5

Which of the following mechanisms does NOT contribute to genetic variation in prokaryotes?

Accepted Answer

Binary fission

Question 6

Horizontal gene transfer (HGT) in prokaryotes can occur through several mechanisms. Which process involves the uptake of naked DNA from the environment?

Accepted Answer

Transformation

Question 7

Which of the following statements about peptidoglycan is correct?

Accepted Answer

It is a complex polymer found in the cell walls of most Bacteria.

Question 8

Which group of prokaryotes is known for its ability to live in extreme environments, such as high temperature or high salinity?

Accepted Answer

Archaea

Question 9

A patient is diagnosed with a bacterial infection. The bacteria are found to have a thick peptidoglycan layer and retain the crystal violet stain in a Gram stain test. Which type of bacteria is most likely responsible?

Accepted Answer

Gram-positive bacteria

Question 10

Which of the following best describes the function of fermentation in prokaryotes?

Accepted Answer

It produces ATP in the absence of oxygen by substrate-level phosphorylation.

Question 11

Which phylum of Bacteria is primarily responsible for oxygenic photosynthesis in aquatic environments?

Accepted Answer

Cyanobacteria

Question 12

Which of the following is a defining feature of Archaea that distinguishes them from Bacteria?

Accepted Answer

Membrane lipids with ether bonds

Question 13

Which of the following is NOT a mechanism of horizontal gene transfer in prokaryotes?

Accepted Answer

Binary fission

Question 14

A researcher isolates a microbe from a hot spring with temperatures above 80°C. Which term best describes this organism?

Accepted Answer

Thermophile

Question 15

Which of the following statements about Koch's postulates is correct?

Accepted Answer

They are a set of criteria to establish a causative relationship between a microbe and a disease.

Question 16

Which of the following best describes a monophyletic group?

Accepted Answer

A group that includes all descendants of a common ancestor.

Question 17

Which of the following is a correct description of the Gram-negative bacterial cell wall?

Accepted Answer

It contains a thin peptidoglycan layer and an outer membrane.

Question 18

Which of the following is a major difference between Bacteria and Archaea?

Accepted Answer

Bacteria have peptidoglycan in their cell walls, while Archaea do not.

Question 19

Which of the following best describes the role of the microbiome in human health?

Accepted Answer

It consists of all the microorganisms living in and on the human body, many of which contribute to health and disease prevention.

Question 20

Which of the following best explains why prokaryotic cells are typically small and have a high surface-area-to-volume ratio?

Accepted Answer

To maximize the rate of diffusion of nutrients and waste products across the cell membrane.

Prokaryotic Diversity, Structure, and Evolution: Bacteria and Archaea

Study Guide - Practice Questions

Study Guide - Flashcards