User:MsCitrus/sandbox

Diversity of Microbes
Outline the classification of living organisms into three domains.
 * Three domains of living organisms
 * Archaebacteria - very primative
 * Eubacteria - more advanced bacteria
 * Eukaryotes - all life forms with eukaryotic cells (have a nucleus)


 * Use of ribosomal RNA sequences for classification
 * rRNA is found in all cells
 * rRNA is easy to isolate
 * analyzed ti determine the exact sequence of nucleotide bases
 * The bases are a complementary copy of DNA
 * Can be compared by the use of computers and statistics

Explain the reasons for the reclassification of living organisms into three domains
 * Woese determined the difference between Archaeabacteria and bacteria
 * There are two types of prokaryotes, mostly unrealeasted as they are to eukaryotes
 * After analyzing RNA molecules, Woese formed three domains

Distinguish between the characteristics of the three domains.

Outline the wide diversity of habitat in the Archaea as exemplified by methanogens, thermophiles and halophiles.
 * Methanogens
 * Obligate anerobes (must be without oxygen)
 * Produce methane as waste product
 * Found in the guts of cows, termite guts, and marshes


 * Thermophiles
 * Live at temperatures close to boiling
 * Tend to be extreme thermophiles (60°C to 100°C)
 * Found in deep sea vents and hot springs


 * Halophiles
 * Like to live in high salt concentrations
 * Tend to be extreme halophiles (very high concentrations)
 * Found in the Great Salt Lake, The Dead Sea, and on Saltines

Microbes and the Environment
Draw a generalised prokaryotic cell as seen in electron microscopes.
 * The diagram should include the cell wall, plasma membrane, mesosome, cytoplasm, ribosomes, plasmid DNA and nucleoid ( region containing naked DNA).