lecture 5 Prokaryotes: Bacteria & Archaea

Question 1

Domain Bacteria examples:

Answer 1

ecoli= disease
cynobacteria= photsynthesis
lactobacillus= benefical

Question 2

Domain archaea examples:

Answer 2

no known pathogens
methogens (methane)
extreme halophiles ( love salt)
extreme thermophiles ( love high temps)

Question 3

Morphological diversity

Answer 3

bacteria specific
shape

Question 4

bacteria cell

Answer 4

does not have nucleus

Question 5

Gram stain

Answer 5

categorixe bacteria based on cell wall compostion
purple Gram +
pink gram -

Question 6

Bacteria cell wall : details

Answer 6

+ : thicker peptidolycan cell wall - which means one membrane

• : thinner , more complex , has outer membrane (2)

Question 7

Bacteria and the biosphere

Answer 7

photosynthetic bacteria: add o2 to atmosphere
bacteria can fix nitrogen
decomposers: circle of life
biodegradable: breaks dwon life

Question 8

Mutalistic bacteria

Answer 8

win/win
microbiome : all microbes in your body

Question 9

Pathogenic bacteria

Answer 9

win/lose
cause disease : salmonella

Question 10

Antibiotics

Answer 10

Penicillin made from fungus inhibits molecule that forms cell wall
more effective on gram postive bacteria than gram-negative bacteria
-overuse can cause antibiotic resistance