Bacterial Identification L12

Question 1

what is taxonomy

Answer 1

defines common traits among strains for a bacterial species

usually genetic as visible traits not that useful

Question 2

what does taxonomy depend on

Answer 2

distance between species so that differences become clear

Question 3

what does family in bacterial classification relate to

Answer 3

contains related genera

Question 4

what does genus in bacterial classification relate to

Answer 4

contains related species

Question 5

what does species in bacterial classification relate to

Answer 5

contains related strains

Question 6

what is a type strain

Answer 6

strain used when species first described
designate a strain with characteristics that defines a group of microbes (define characteristics of that group using type strain)
Based on characteristics (broader)
Can be for a species, a genus or a type
Often used as controls to compare results with

Question 7

how is bacteria identified

Answer 7

Starts with Isolation (culture)
Agar plate plate/colonies
Allows purification
using streaking for colonies
then bacterial morphology

Question 8

what are the basic morphological characteristics

Answer 8

Colony morphology
Pigmentation
Evidence of motility

Question 9

what is punctiform

Answer 9

small colonies showing no evidence of motility

Question 10

what do spreading colonies indicate

Answer 10

motility occurring
Chemotactic rings of movement often seen
Motility not always evident due to regulation in response to environmental conditions

Question 11

what gives evidence of EPS

Answer 11

Colonies appear smooth and slimey

Colonies appear wrinkled or crenelated

Question 12

what is EPS and slim function

Answer 12

stop bacteria drying out