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BIOS 280 Lab Quiz 3 ; Questions and Answers
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BIOS 280 Lab Quiz 3 ; Questions and Answers
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BIOS 280 Lab Quiz 3 ; Questions and Answerstrypticase soy agar is an example of a ____ medium Correct Ans-rich (undefined)
most bacteria grow well on ____ media Correct Ans-rich
a ____ medium is one that only allows the growth of certain kinds of bacteria Correct Ans-
selective
an example of selective media is that eosin methylene blue (EMB) agar contains chemicals
that are usually toxic to Gram-positive bacteria; this means that usually only Gram-____
bacteria can grow on EMB agar Correct Ans-negative
an example of selective media is that mannitol salt agar (MSA) contains a high concentration
of salt that selects for the growth of halophiles; the media usually discourages the growth of
Gram-____ bacterial cells and encourages the growth of Gram-____ bacteria, especially
bacteria of the genus Staphylococcus Correct Ans-negative
positive
, BIOS 280 Lab Quiz 3 ; Questions and Answers
there are even selective agars that discourage ____ growth; Sabouraud's agar is toxic to
bacteria but supports the growth of fungi Correct Ans-bacterial
a ____ medium is one that, in some way, shows a difference between the colonies of
organisms that grow on the medium Correct Ans-differential
an example of differential media is that on EMB agar, the colonies of organisms that ferment
lactose appear ____, while the colonies of non-fermenters will be white or pale ____
Correct Ans-purple
pink
on some differential agars, there is a change in the color of the colonies; on other differential
agars the color of the ____ itself may change; differential media can be very helpful in
identifying bacteria Correct Ans-agar
glucose mineral salt agar (GMS) is a ____, chemically defined medium; to survive, organisms
need to make all their cellular components from ____ and the inorganic salts that are in the
medium; no growth factors are present Correct Ans-simple
glucose
, BIOS 280 Lab Quiz 3 ; Questions and Answers
trypticase soy agar (TSA) is a rich, complex ____ medium with soy products and proteins; it
supports the growth of most bacteria, including those that require vitamins, pre-formed
amino acids, or other ____ factors Correct Ans-undefined
growth
Eosin Methylene Blue (EMB) is an agar that is both selective and differential; it is usually
selective for Gram-____ rods and usually inhibits the growth of Gram-____ bacteria
Correct Ans-negative
positive
Eosin Methylene Blue (EMB) is also differential for bacteria that can ferment ____; a lactose
fermenter will produce dark purple colonies; if the fermenter also produces a lot of ____ as a
waste product, the colonies will take on a green sheen Correct Ans-lactose
acid
non-fermenters will also grow well on EMB, but those colonies will be white or light ____
Correct Ans-pink
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