Section outline

  • Microscopic image showing Rickettsia rickettsii, the bacterium that causes Rocky Mountain spotted fever, infecting tick cells. Special staining techniques are used to make the bacteria visible.This module explores the diverse habitats, essential functions, and classification of prokaryotes, building on your foundational microbiology knowledge to deepen your understanding of bacteria and archaea. You will examine symbiotic relationships that influence human health and learn how Gram-positive and Gram-negative bacteria are classified and grouped based on staining patterns. By studying prokaryotic genetics and the unique characteristics of archaea, this module prepares you to recognize and respond effectively to infections—a critical skill for nursing practice. Mastering these concepts will enhance your ability to diagnose and manage microbial infections, while supporting your career development by equipping you with the knowledge needed to improve patient outcomes.

    Image: Gimenez stain of tick hemolymph cells infected with Rickettsia rickettsii, the causative agent of Rocky Mountain spotted fever. Source: (1979; CDC; Public Domain)

    Upon completion of this module, you will be able to:

    • Describe the major habitats of prokaryotes and how environmental factors shape their distribution (Linked COs: 1, 3).
    • Explain the diverse functions of prokaryotes, their vast abundance, and their ecological significance across various environments (Linked COs: 1, 4).
    • Identify and differentiate the types of symbiotic relationships involving microbes, including mutualism, commensalism, and parasitism (Linked COs: 1, 3).
    • Explain the ecological and biological significance of microbial symbioses in natural environments and host organisms (Linked COs: 1, 5).
    • Describe the diversity within Gram-negative bacteria, highlighting key characteristics of Proteobacteria (Linked COs: 1).
    • Explain the ecological roles and significance of different Proteobacteria groups (Linked COs: 1, 4).
    • Identify major Nonproteobacteria groups and summarize their unique features and functions (Linked COs: 1).
    • Differentiate between high G+C and low G+C Gram-positive bacteria based on their genetic and phenotypic characteristics (Linked COs: 1).
    • Describe the ecological roles and industrial or medical significance of Actinobacteria and other Gram-positive bacteria (Linked COs: 1, 5).
    • Compare the structural and genetic characteristics that distinguish Archaea from bacteria, including differences in cell membrane composition, cell wall structure, and genome complexity (Linked COs: 1).
    • Describe the diversity of Archaea, highlighting major phyla such as Crenarchaeota and Euryarchaeota, and explain their adaptations to extreme environments and unique metabolic processes like methanogenesis and sulfur oxidation (Linked COs: 1).
    • Explain how genetic material determines the genotype and how this translates into phenotype in prokaryotes through the processes of DNA replication, transcription, and translation (Linked COs: 1).
    • Describe the mechanisms of horizontal gene transfer in prokaryotes—transformation, transduction, and conjugation—and discuss their significance in genetic diversity and evolution (Linked COs: 1, 5).

    To achieve these objectives: 

    1. Read the Module 3 Introduction
    2. Read Chapter 3 in Medical Microbiology for Nursing and Allied Health: A Louisiana Perspective
    3. Complete the H5P questions in the chapter

    Module Pressbooks Resources and Activities

    You will find the following resources and activities in this module at the Pressbooks website. Click on the links below to access or complete each item.

Accessibility
Reset All

Background Colour Background Colour

Font Face Font Face

Font Kerning Font Kerning

Font Size Font Size

1

Image Visibility Image Visibility

Letter Spacing Letter Spacing

0

Line Height Line Height

1.2

Link Highlight Link Highlight

Text Colour Text Colour