BIOL 250 Quiz 6, Quiz 7 Test
Questions and Correct Answers.
the process of binary fission begins with one parent cell and results in the production of what -
Answer two daughter cells
in bacterial cells, how does replication of DNA occcur? - Answer continuously
most bacteria have how many of what type of chromosome? - Answer 1 circular
most bacteria's chromosome is attached where? - Answer cell membrane
what are the four different phases of bacterial growth? - Answer lag log stationary death
what can influence the length of the lag phase? - Answer old media new media bacterial
species
which techniques rely on the concept hat under the proper conditions, only living bacteria will
divide and form a visible colony on agar? - Answer standard plate count and serial dilution
e. coli is a bacterium that can grow in the absence of oxygen, which would classify it as an -
Answer facultative anaerobe
a process in which endospores begin to develop into vegetative cells once favorable conditions
are returned - Answer germination
type of cell reproduction in which a small new cell develops from the surface of an existing cell
and subsequently separates from the parent cell - Answer budding
Type of reproduction yeast undergoes - Answer budding
in what stage of bacterial growth is the number of newly generated cells equal to the number of
dying cells - Answer stationary
a bacterial culture can be kept in the log phase of growth indefinitely with the use of what -
Answer chemostat
, which counting technique does not differentiate between live and dead bacterial cells in a
culture? - Answer direct microscopic count
which bacterial counting technique relies most heavily on statistical estimates to determine the
number of bacteria in a culture - Answer most probable number
Turbidity in a bacterial culture can be measured using - Answer spectrophotometer
Acidophiles might be expected to grow best at a pH of - Answer .1-5.4
Most human pathogens are - Answer mesophiles
an obligate psychrophile would produce a turbid culture Between ___ and ___ degrees celsius -
Answer 15-20
what reduces the toxic byproducts of oxygen metabolism? - Answer superoxide dismutase
peroxidase catalase
when cells are in a hypertonic environment they will - Answer lyse
organisms with special nutritional needs are - Answer fastidious
4 common trace elements - Answer cobalt iron zinc copper
not metabolically active, non reproductive protective structures - Answer endospore
Increase in the number of cells by cell division - Answer microbial growth
the process in which a cell duplicates its components and divides into 2 daughter cells - Answer
binary fission
linked bacilli resulting from incomplete separation in binary fission - Answer linear chains
cuboidal groups of 4 cocci resulting from incomplete separation in binary fission - Answer
tetrads
Questions and Correct Answers.
the process of binary fission begins with one parent cell and results in the production of what -
Answer two daughter cells
in bacterial cells, how does replication of DNA occcur? - Answer continuously
most bacteria have how many of what type of chromosome? - Answer 1 circular
most bacteria's chromosome is attached where? - Answer cell membrane
what are the four different phases of bacterial growth? - Answer lag log stationary death
what can influence the length of the lag phase? - Answer old media new media bacterial
species
which techniques rely on the concept hat under the proper conditions, only living bacteria will
divide and form a visible colony on agar? - Answer standard plate count and serial dilution
e. coli is a bacterium that can grow in the absence of oxygen, which would classify it as an -
Answer facultative anaerobe
a process in which endospores begin to develop into vegetative cells once favorable conditions
are returned - Answer germination
type of cell reproduction in which a small new cell develops from the surface of an existing cell
and subsequently separates from the parent cell - Answer budding
Type of reproduction yeast undergoes - Answer budding
in what stage of bacterial growth is the number of newly generated cells equal to the number of
dying cells - Answer stationary
a bacterial culture can be kept in the log phase of growth indefinitely with the use of what -
Answer chemostat
, which counting technique does not differentiate between live and dead bacterial cells in a
culture? - Answer direct microscopic count
which bacterial counting technique relies most heavily on statistical estimates to determine the
number of bacteria in a culture - Answer most probable number
Turbidity in a bacterial culture can be measured using - Answer spectrophotometer
Acidophiles might be expected to grow best at a pH of - Answer .1-5.4
Most human pathogens are - Answer mesophiles
an obligate psychrophile would produce a turbid culture Between ___ and ___ degrees celsius -
Answer 15-20
what reduces the toxic byproducts of oxygen metabolism? - Answer superoxide dismutase
peroxidase catalase
when cells are in a hypertonic environment they will - Answer lyse
organisms with special nutritional needs are - Answer fastidious
4 common trace elements - Answer cobalt iron zinc copper
not metabolically active, non reproductive protective structures - Answer endospore
Increase in the number of cells by cell division - Answer microbial growth
the process in which a cell duplicates its components and divides into 2 daughter cells - Answer
binary fission
linked bacilli resulting from incomplete separation in binary fission - Answer linear chains
cuboidal groups of 4 cocci resulting from incomplete separation in binary fission - Answer
tetrads
