BACTERIA.

Slides:



Advertisements
Similar presentations
Prokaryotes. Prokaryotes Classification of prokaryotes has dramatically changed due to analysis of the genomes of various types of cells:Classification.
Advertisements

And Bacterial Creepers I study the lives on a leaf:the little Sleepers, numb nudgers in cold dimensions Beetles in caves, newts, stone-deaf fishes, Lice.
Kingdom Monera (Bacteria and Archaebacteria)
Classification and Taxonomy. Phylogeny The most recent model for the basic divisions of life is the “three domain model”, first put forth by Carl Woese.
Bacteria & Viruses Also Known As… Why We Beat the Aliens at the End of “War of the Worlds”
Eukaryotes vs Prokaryotes And Bacteria SBI 3C: OCTOBER 2012.
Bacteria §Cells are prokaryotic and amongst the smallest known cells ( length µm ). §No membrane bound nucleus. §Have ribosomes,but no other.
Bacteria Ch.19-1 By: A. Cortez. Classifying Prokaryotes Thanks to Robert Hooke and Anton van Leeuwenhoek, the invention of the microscope opened our eyes.
Prokaryote: no nucleus or organelles –Chromosome & plasmids float freely in cytoplasm Ribosomes: create proteins Flagella: used in movement Pili: act.
Prokaryotic life Characteristics, Classification, Evolution.
Bacteria. Prokaryotes Single-celled organisms that lack a nucleus, usually very small Also known as bacteria.
Chapter 23: Bacteria Archaea and Bacteria. Kingdom Archaebacteria – the most primitive organisms (archae = ancient) live in harsh conditions including.
Kingdom Monera Chapter Bacteria  Bacteria or one-celled prokaryotes are cells without a nucleus and they’re found everywhere!  Bacteria are very.
KINGDOM MONERA.
Chapter 18 Bacteria.
Bacteria What you need to know!!!!. What are Bacteria? They are prokaryotes that have cell walls containing peptidoglycans. Prokaryotes: Organisms who’s.
Bacteria Classification and Characteristics By: Sarah Haudrich, Kiley Plenderl eith and Jimmy Livingston.
Prokaryotes: Bacteria. Bacteria Found on almost every square cm of Earth Bacteria = prokaryotes –Remember: no nucleus and no membrane bound organelles.
Five-Kingdom Survey Taxonomy – Categories called taxa (singular = taxon) Kingdom Phylum Class Order Family Genus Species.
Bacteria. VOCABULARY Spirilla Bacilli Cocci Flagella Fission Aerobes Anaerobe Facultative Anaerobe Antibiotics Saprophytes Nitrogen-Fixing Bacteria Pathogen.
BACTERIA. Bacteria Most numerous organisms on earth Earliest life forms (fossils: 2.5 billion years old) Contain ribosomes Surrounded by protective cell.
Kingdom Archaea Formerly known as the Archaeabacteria.
Bacteria & Archaea Eukarya Bacteria Archaea.
Copyright Pearson Prentice Hall
Bacteria: Classification
Chapter 12.1 The Prokaryotes: Kingdom Archae and Bacteria
Domains (and Kingdoms) Archaea and Eubacteria
General Animal Biology
Chapter #20 : Bacteria and Viruses
Three Domains of Living Things
Copyright Pearson Prentice Hall
Most environments (most abundant)
Most environments (most abundant)
By: Daniel Ospina and Nicolle Rodriguez
2.2 Bacteria.
Prokaryotic Cells.
Bacteria Biology 20 Blue Green Algae Diagram of Bacteria
The Prokaryotes Chapter 16.
Biology of Prokaryotes
Bacteria and Archaea.
Bacteria is plural Bacterium is singular
Structure and Function
Bacteria & Archaea Eukarya Bacteria Archaea.
Archaebacteria and Eubacteria
Bacteria and Viruses Bacteria.
Bacteria and Viruses Bacteria.
Classification of Bacteria
Chapter 18 Overview of Bacteria.
Bacteria.
Bacteria For every “human” cell, there are 20 bacteria present on our body (but they are smaller)…..this accounts for ~10% of the mass that you carry around.
Copyright Pearson Prentice Hall
EUBACTERIA and ARCHAEBACTERIA pp
EUBACTERIA and ARCHAEBACTERIA pp
Bacteria classification and characteristics
Bacteria Characteristics.
Bacteria.
Kingdom Archaebacteria
Bacteria Characteristics.
Bacteria.
KEY CONCEPT Bacteria and archaea are both single-celled prokaryotes.
General Animal Biology
Bacteria & Viruses Chapter 19.
Bacteria Characteristics.
An introduction to bacteria
Classifying Prokaryotes
Bacteria Characteristics.
More on Monerans.
I. Prokaryotes Bacilli Cocci Spirilla.
Prokaryotes: Bacteria & Archaea
BACTERIA.
Presentation transcript:

BACTERIA

Bacteria Cells are prokaryotic and amongst the smallest known cells ( length 0.5-20 µm ). Lack a nucleus DNA is naked, a single loop not bound in a chromosome May contain plasmids (small circular fragments of DNA) Have ribosomes, but no other organelles. DNA present as a long circular molecule.

Structure of a Bacteria

Classification All bacteria are prokaryotes, which can be placed in one of two kingdoms: Archaebacteria: “Ancient Bacteria” Archaebacteria “True Bacteria”

Archaebacteria “Archae” means primitive or early Oldest organisms on the plant ~ 3 billion yrs old Live in extreme conditions: Environments in which no other organisms can survive

Environments of Archaebacteria These bacteria are characterized as living in extreme conditions that have: High temperatures (Thermophiles) Low temperatures (Psychrophiles) High Salt concentrations (Halophiles) High acidity Environments with no oxygen (anerobic)

Archaebacteria Thermophilic bacteria thrive in volcanic vents Halophilic bacteria thrive in salty lakes

Eubacteria All other bacteria. Strong cell walls and less complicated genetic makeup. Live in many habitats Most common form of life on earth Can be bad (pathogens) or good (digestion) Organisms: Bacteria, Cyanobacteria

How to Classify Bacteria Shape Cell walls How they move How they obtain Energy

Spiral, called Spirilla or Spirochetes Cell Shape One way that bacteria can be identified is by their shape: Enterococci: spherical Lactobacilli: rod-shaped Spirochaeta: spiral Rod-shaped, called Bacilli Spiral, called Spirilla or Spirochetes Spherical

Coccus Spherical shaped bacteria are called Cocci Single cells - monococci Pairs - diplococci Chains - streptococci

Bacillus Rod shaped Bacteria are called Bacilli Exists as: Single Cells In pairs (diplobacilli) In chains (streptobacilli).

Spirilla Spiral shaped bacteria are called Spirilla Spirillum (Singular) Plural is spirilli. Exist only as single cells.

Cell Wall The chemical nature of a cell wall can be studied by a method known as Gram Staining Hans Christian Gram: inventor of Gram Staining

Gram Staining Gram stains contain of two dyes Crystal Violet (Purple) Safranine (Red) Gram-positive bacteria: cells with only 1 thick layer of carbohydrate and protein molecules took up the crystal violet dye. Gram-negative bacteria: cells wall contains a second layer of lip and carbohydrate took up the crystal violet dye.

Appears red after Gram’s stain Appears violet after Gram’s stain GRAM STAIN It is the most important differential stain used in bacteriology because it classified bacteria into two major groups: b) Gram negative: Appears red after Gram’s stain Gram positive: Appears violet after Gram’s stain

Bacterial Movement Bacteria can be identified by studying how them move: Some bacteria propel themselves by the means of 1 or more whip-like structures called a flagella Some bacteria produce a thick layer of slime to glide about Others remain stationary

How bacteria obtain Energy Autotrophs: Organisms that make their own energy Phototrophic Autotrophs: Bacteria that get there energy from sunlight Chemotropic Autotrophs: Bacteria that obtain their energy from inorganic molecules Inorganic molecules: Hydrogen sulphide, nitrites, sulphur and iron

Examples of Autotrophic Bacteria Phototrophic autotroph: Cyanobacteria Chemotrophic Autotrophs: Ecoli bacteria

How Bacteria obtain Energy HETEROTROPHS: Energy is obtained from other organisms Chemotrophic heterotrophs: obtain energy by dissolving and absorbing organic material Phototrophic heterotrophs : obtain sunlight for energy, but need organic compound for nutrition.

Examples of Heterotrophic Bacteria Chemotrophic heterotroph: Salmonella

Bacterial Respiration and Fermentation Bacteria need a constant supply of energy to perform their life activities Energy is supplied by the process of: Respiration: A process that involves oxygen and the breakdown of food molecules to release energy Fermentation: the process that enables cells to carry out energy production in the absence of oxygen

Bacterial Respiration Bacteria can be classified into three categories based on their need for oxygen 1. Obligate aerobe: Must have O2 to live 2. Obligate anaerobes: Must live in O2 free environment 3. Facultative anaerobes: Can live with or without O2

RECAP QUESTIONS How would this bacteria be classified according to shape? Is this bacteria a Gram-positive or Gram-negative bacteria?