BIOL 271 / BIOL271
Microbiology — Module 1
Enhanced Exam-Oriented Study Guide • 2026/2027 Edition
Original study resource. Created from the public preview of the referenced Stuvia listing and related public Module 1 topic
information. It does not reproduce the paid document or protected exam questions.
How to Use This Guide
• Master concepts rather than memorizing isolated answers.
• Use the sequence structure → function → identification → clinical/lab significance when studying microbes.
• Practice distinguishing terms that look similar: prokaryote/eukaryote, sterilization/disinfection, bactericidal/bacteriostatic,
magnification/resolution, endemic/epidemic/pandemic/sporadic.
• When a question gives a laboratory method, ask what it is designed to reveal or remove.
• Use the practice section after reviewing the content; explain why each distractor is wrong.
Module 1 High-Yield Map
Area Must Know
History Leeuwenhoek, Pasteur, germ theory and spontaneous generation
Cell biology Prokaryotic vs eukaryotic structure and functions
Genetics DNA/RNA, chromosomes, plasmids and basic information flow
Classification Taxonomy, domains, scientific naming and microbial groups
Microscopy Magnification, resolution, contrast and major microscope types
Staining Simple stain, differential stains and Gram-stain logic
Control Sterilization, disinfection, antisepsis, sanitation and aseptic technique
Microbial ecology Normal microbiota, disease terminology and transmission concepts
Lab safety Contamination prevention, PPE, aseptic handling and disposal
1. Introduction to Microbiology & the Microbial World
Leeuwenhoek
Often called the Father of Microbiology because his simple microscopes allowed him to observe living microorganisms.
Pasteur
His swan-neck flask work provided strong evidence against spontaneous generation of microorganisms and supported biogenesis.
Germ theory
Disease can be caused by microorganisms; this transformed infection control, sanitation and medical practice.
Koch
Developed classic criteria connecting particular microorganisms with particular diseases and advanced the laboratory study of
pathogens.
Microbial diversity
Microorganisms include bacteria, archaea, fungi, protozoa, algae and acellular infectious agents such as viruses.
BIOL 271 / BIOL271 Microbiology Module 1 — Enhanced Study Guide Page 1
, 2. Prokaryotic vs Eukaryotic Cells
Feature Prokaryotic Eukaryotic
Nucleus No membrane-bound nucleus Membrane-bound nucleus
DNA Usually a main circular chromosome; may have plasmids Multiple linear chromosomes
Organelles No membrane-bound organelles Many membrane-bound organelles
Ribosomes 70S 80S cytoplasmic ribosomes
Typical size Generally smaller Generally larger
Examples Bacteria and archaea Fungi, protozoa, algae, plants, animals
Capsule
External layer that can promote adherence and help some bacteria evade host defenses or desiccation.
Cell wall
Provides structural support and helps prevent osmotic lysis. Bacterial walls commonly contain peptidoglycan.
Plasma membrane
Selective barrier involved in transport and energy-related processes.
Flagella
Structures used for motility in many bacteria.
Fimbriae
Short appendages commonly associated with attachment.
Pili
Some pili mediate attachment; specialized sex pili can participate in conjugation.
Endospore
Highly resistant dormant structure formed by some bacterial genera under unfavorable conditions; it is not a reproductive
mechanism.
Ribosomes
Sites of protein synthesis; bacterial ribosomes are an important antibiotic target.
3. Microbial Genetics & Information Flow
DNA
Stores hereditary information and is capable of replication.
RNA
Participates in gene expression and can have multiple functional forms, including mRNA, rRNA and tRNA.
Chromosome
The major DNA molecule carrying essential genetic information.
Plasmid
Usually a small extrachromosomal DNA molecule capable of independent replication; may carry advantageous genes such as
resistance determinants.
Central dogma
BIOL 271 / BIOL271 Microbiology Module 1 — Enhanced Study Guide Page 2
Microbiology — Module 1
Enhanced Exam-Oriented Study Guide • 2026/2027 Edition
Original study resource. Created from the public preview of the referenced Stuvia listing and related public Module 1 topic
information. It does not reproduce the paid document or protected exam questions.
How to Use This Guide
• Master concepts rather than memorizing isolated answers.
• Use the sequence structure → function → identification → clinical/lab significance when studying microbes.
• Practice distinguishing terms that look similar: prokaryote/eukaryote, sterilization/disinfection, bactericidal/bacteriostatic,
magnification/resolution, endemic/epidemic/pandemic/sporadic.
• When a question gives a laboratory method, ask what it is designed to reveal or remove.
• Use the practice section after reviewing the content; explain why each distractor is wrong.
Module 1 High-Yield Map
Area Must Know
History Leeuwenhoek, Pasteur, germ theory and spontaneous generation
Cell biology Prokaryotic vs eukaryotic structure and functions
Genetics DNA/RNA, chromosomes, plasmids and basic information flow
Classification Taxonomy, domains, scientific naming and microbial groups
Microscopy Magnification, resolution, contrast and major microscope types
Staining Simple stain, differential stains and Gram-stain logic
Control Sterilization, disinfection, antisepsis, sanitation and aseptic technique
Microbial ecology Normal microbiota, disease terminology and transmission concepts
Lab safety Contamination prevention, PPE, aseptic handling and disposal
1. Introduction to Microbiology & the Microbial World
Leeuwenhoek
Often called the Father of Microbiology because his simple microscopes allowed him to observe living microorganisms.
Pasteur
His swan-neck flask work provided strong evidence against spontaneous generation of microorganisms and supported biogenesis.
Germ theory
Disease can be caused by microorganisms; this transformed infection control, sanitation and medical practice.
Koch
Developed classic criteria connecting particular microorganisms with particular diseases and advanced the laboratory study of
pathogens.
Microbial diversity
Microorganisms include bacteria, archaea, fungi, protozoa, algae and acellular infectious agents such as viruses.
BIOL 271 / BIOL271 Microbiology Module 1 — Enhanced Study Guide Page 1
, 2. Prokaryotic vs Eukaryotic Cells
Feature Prokaryotic Eukaryotic
Nucleus No membrane-bound nucleus Membrane-bound nucleus
DNA Usually a main circular chromosome; may have plasmids Multiple linear chromosomes
Organelles No membrane-bound organelles Many membrane-bound organelles
Ribosomes 70S 80S cytoplasmic ribosomes
Typical size Generally smaller Generally larger
Examples Bacteria and archaea Fungi, protozoa, algae, plants, animals
Capsule
External layer that can promote adherence and help some bacteria evade host defenses or desiccation.
Cell wall
Provides structural support and helps prevent osmotic lysis. Bacterial walls commonly contain peptidoglycan.
Plasma membrane
Selective barrier involved in transport and energy-related processes.
Flagella
Structures used for motility in many bacteria.
Fimbriae
Short appendages commonly associated with attachment.
Pili
Some pili mediate attachment; specialized sex pili can participate in conjugation.
Endospore
Highly resistant dormant structure formed by some bacterial genera under unfavorable conditions; it is not a reproductive
mechanism.
Ribosomes
Sites of protein synthesis; bacterial ribosomes are an important antibiotic target.
3. Microbial Genetics & Information Flow
DNA
Stores hereditary information and is capable of replication.
RNA
Participates in gene expression and can have multiple functional forms, including mRNA, rRNA and tRNA.
Chromosome
The major DNA molecule carrying essential genetic information.
Plasmid
Usually a small extrachromosomal DNA molecule capable of independent replication; may carry advantageous genes such as
resistance determinants.
Central dogma
BIOL 271 / BIOL271 Microbiology Module 1 — Enhanced Study Guide Page 2
