Download - Comparing Archaea and Bacteria
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Comparing Archaea and Bacteria
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RecallArchaea and Bacteria more different than an apple tree
and a blue whale!
Scientists then assigned the rank of Domain to highlight these
differences
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Tree of Life - Domains
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Archaea
Three major types of archaea1) Methanogens2) Halophiles3) Thermophiles
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Methanogens
• Methane producing bacteria• Live below surfaces in swamps, bogs, marshes
and sewage treatment plants• Use CO2, N2, or HS for energy
• Expell CH4 as a waste product
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Halophiles
• Salt loving archaea• Live in salt pools, evaporation ponds etc. • Live in salt concentrations of 15% or greater
(normal seawater is 3.5%)
I
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Thermoacidophiles
• Extreme heat environments• Live in hot sulphur springs• Use sulphur for energy• Some live near volcanoes• Grow best at 80oC + temperatures
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Similarities and Differences between Archaea and Bacteria
• In the following slides, we will look at:– Morphology – Size, shape– Nutrition – what it eats– Habitats – where it lives– Reproduction – Classification
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Morphology - Size
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Morphology - ShapeSpherical forms are calledcocci (plural) or coccus (singular)
Enterococcus – found in intestines of warm blooded animals
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Morphology - ShapeRod forms are called bacilli (plural)or bacillus (singular)
E.Coli – found in intestines (cows), strain 0157 can lead to food poisoning in humans
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Morphology - ShapeSpirrila - Spiral shaped
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Aggregations: Cells Grouped Together
Streptococcus bacteria are foundin chains of spheres
Some individual prokaryotic cells(bacteria or archaea) grouptogether
Streptobacillus bacteria are rodshaped and found in chains
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Comparing Nutrition Archaea process of methanogenesis to obtainnutrients. Methanogenesis is an anaerobic processthat occurs in environments that lack oxygen
Some Archaea use sunlight as a source of metabolicenergy but no reliable evidence of photosynthesis.
Bacteria some are photosynthetic
Example: Cyanobacteria use solar energy to convert carbon dioxide and water into sugar and oxygen.
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Comparing Habitats Both archaea and bacteria occupy environments with
oxygen (aerobic) and without oxygen (anaerobic)
Archaea ability to live in extreme environments called extremophiles.
Bacteria organisms that occupy environments with moderate (less extreme) conditions called mesophiles. There are few extremophilic bacteria.
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Habitats of Extremophiles
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Reproduction – Binary FissionProkaryotes reproduce through the asexual process ofbinary fission producing two genetically identical cells
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Conjugation
Conjugation there is transfer of genetic material (DNA)Involving two cells (prokaryotes)
Plasmids aresmall loops ofDNA that can betransferred.
A pilustransfersDNAmaterial
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Endospores: Protecting Genetic Material
Endospores dormant bacterial cells able to survive for long periods during
extreme conditions E.g. freezing or high temperatures, radiation & toxic chemicals)
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Identifying Bacteria & Archaea
A Gram stain is used to divide bacteria into 2 groups
Gram-positive bacteria have athick protein layer on their cellwall and stain purple.
Gram-negative bacteria have athin protein layer on their cellwall and stain pink.
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Bacteria & Human Health
B)Streptococcuspygones is aGram-positivebacterium thatcauses strepthroat infections
A) Clostridiumbotulinum is ananaerobic bacteriumthat can causeillness in humans
C) Streptococcusmutans is a Grampositivebacteriumthat causes toothdecay