Biology 2601L: Bacteriology and Epidemiology

bacteria

prokaryotes

prokaryotes

simplest living organisms

characteristics of prokaryotes

no membrane bound nucleus

DNA is not associated with proteins (to form chromosomes)

folded plasma membrane

lack membrane bound organelles

mitochondria and chloroplast are circular and organized into nucleoids

nucleoid

bacteria DNA concentrated in a mass

endosymbiosis

An association of two organisms in which one lives inside the other

3 shapes of bacteria

bacillus (rod-shaped), coccus (spherical), and spirillum (spiral)

pathogens

agents of disease

staphylo

cluster

coccus

the way an organism grows

strepto

bent or twisted

cyanobacteria

photosynthetic bacteria

unicellular

consisting of one cell

colony

group of cells

filaments

cells arranged in a linear fashion

heterocysts

thick-walled cells in which nitrogen fixation takes place

Antibacterials

substances that inhibit or prevent the growth of bacteria

Antibiotics

antibacterial substances produced by living organisms

what is the cause of disease?

the presence of bacteria or of toxins the bacteria produce

antibacterials target all

prokaryotic cells

What does growing bacteria look like on a petri dish?

Small, round colonies that look somewhat slimy.

Colors can be white, off-white, or yellow.

What does growing fungi look like on a petri dish?

hairy or fuzzy spots (could be spores) that appear as a dark, powdery substance

spore

dormant cells that each can form a new colony

what does a petri dish contain?

nutrients that support the growth of certain microorganisms

microvilli

folds in the plasma membrane