Department of microbiology.
MCB201(100lv/200lv)
This article contain a summary of all you need to know in your 100 and 200lv microbiology and
is also for students in other medical courses as well.
INTRODUCTION:1. Introduction to Microbiology
Definition: Microbiology is the study of microorganisms—tiny life forms too small to be seen with the naked
eye. This includes bacteria, viruses, fungi, protozoa, and algae.
Brief History: Pioneers like Anton van Leeuwenhoek (first observed microbes), Louis Pasteur (germ theory,
pasteurization), and Robert Koch (Koch's postulates) contributed to microbiology's foundations.
Branches of Microbiology.
Bacteriology – study of bacteria
Virology – study of viruses
Mycology – study of fungi
Parasitology – study of parasites
Immunology – study of immune system interactions with microbes
Microbial genetics and molecular biology
2. Microbial Structure and Function
Prokaryotes vs. Eukaryotes:
Prokaryotes: No nucleus, include bacteria and archaea
Eukaryotes: Have a nucleus, include fungi, protozoa, and algae
Cell Structures:
Bacteria: Cell wall (peptidoglycan), plasma membrane, ribosomes, flagella, pili
Fungi: Cell walls made of chitin
, Viruses: Composed of DNA or RNA and a protein coat (capsid), sometimes an envelope
3. Microbial Growth and Metabolism
Nutritional Types: Autotrophs (make their own food) and heterotrophs (depend on others)
Environmental Factors: Temperature, pH, oxygen availability, and salinity influence growth
Growth Curve: Lag, log (exponential), stationary, and death phases
Metabolism: Includes catabolism (breaking down molecules) and anabolism (building molecules)
4. Microbial Genetics
DNA Replication, Transcription, and Translation
Plasmids: Small DNA molecules in bacteria, often carry antibiotic resistance genes
Gene Transfer Mechanisms:
Transformation: Uptake of DNA from the environment
Transduction: Transfer of DNA by viruses
Conjugation: Transfer of DNA via direct contact (pilus)
Mutation and Genetic Engineering: Used in biotechnology and research
5. Virology
Structure of Viruses: DNA or RNA core, protein coat, and sometimes a lipid envelope
Virus Life Cycles:
Lytic cycle: Immediate replication and destruction of host
Lysogenic cycle: Viral DNA integrates into host genome
Types of Viruses: Animal viruses, plant viruses, bacteriophages
Vaccines and Antiviral Drugs: Key in prevention and treatment
6. Immunology
Innate Immunity: Non-specific, first line of defense (skin, mucous, phagocytes)
Adaptive Immunity: Specific, involves lymphocytes (B cells and T cells)
Antigens and Antibodies: Antibodies bind to specific antigens to neutralize them
Immunization: Active (vaccines) and passive (antibody transfer)
Immune Disorders: Autoimmunity, immunodeficiency, hypersensitivity
MCB201(100lv/200lv)
This article contain a summary of all you need to know in your 100 and 200lv microbiology and
is also for students in other medical courses as well.
INTRODUCTION:1. Introduction to Microbiology
Definition: Microbiology is the study of microorganisms—tiny life forms too small to be seen with the naked
eye. This includes bacteria, viruses, fungi, protozoa, and algae.
Brief History: Pioneers like Anton van Leeuwenhoek (first observed microbes), Louis Pasteur (germ theory,
pasteurization), and Robert Koch (Koch's postulates) contributed to microbiology's foundations.
Branches of Microbiology.
Bacteriology – study of bacteria
Virology – study of viruses
Mycology – study of fungi
Parasitology – study of parasites
Immunology – study of immune system interactions with microbes
Microbial genetics and molecular biology
2. Microbial Structure and Function
Prokaryotes vs. Eukaryotes:
Prokaryotes: No nucleus, include bacteria and archaea
Eukaryotes: Have a nucleus, include fungi, protozoa, and algae
Cell Structures:
Bacteria: Cell wall (peptidoglycan), plasma membrane, ribosomes, flagella, pili
Fungi: Cell walls made of chitin
, Viruses: Composed of DNA or RNA and a protein coat (capsid), sometimes an envelope
3. Microbial Growth and Metabolism
Nutritional Types: Autotrophs (make their own food) and heterotrophs (depend on others)
Environmental Factors: Temperature, pH, oxygen availability, and salinity influence growth
Growth Curve: Lag, log (exponential), stationary, and death phases
Metabolism: Includes catabolism (breaking down molecules) and anabolism (building molecules)
4. Microbial Genetics
DNA Replication, Transcription, and Translation
Plasmids: Small DNA molecules in bacteria, often carry antibiotic resistance genes
Gene Transfer Mechanisms:
Transformation: Uptake of DNA from the environment
Transduction: Transfer of DNA by viruses
Conjugation: Transfer of DNA via direct contact (pilus)
Mutation and Genetic Engineering: Used in biotechnology and research
5. Virology
Structure of Viruses: DNA or RNA core, protein coat, and sometimes a lipid envelope
Virus Life Cycles:
Lytic cycle: Immediate replication and destruction of host
Lysogenic cycle: Viral DNA integrates into host genome
Types of Viruses: Animal viruses, plant viruses, bacteriophages
Vaccines and Antiviral Drugs: Key in prevention and treatment
6. Immunology
Innate Immunity: Non-specific, first line of defense (skin, mucous, phagocytes)
Adaptive Immunity: Specific, involves lymphocytes (B cells and T cells)
Antigens and Antibodies: Antibodies bind to specific antigens to neutralize them
Immunization: Active (vaccines) and passive (antibody transfer)
Immune Disorders: Autoimmunity, immunodeficiency, hypersensitivity
