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Micro > Lab Quiz 1 > Flashcards

Lab Quiz 1 Flashcards

1
Q

What is the binomial system?

A

the method of naming microorganisms that combines the genus name and the species epithet

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2
Q

What properties of microorganisms lead to the rigid requirements of handling them?

A

they are extremely small, metabolize rapidly, and reach large numbers in a short time period

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3
Q

What is a pure culture?

A

culture in which each cell is a direct descendant of a single cell from a culture containing cells of only one species

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4
Q

What is prodigiosin?

A

the pigment in S. marcescens that causes it to be deep-red

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5
Q

(more/less) light is needed at higher magnification than lower magnifications

A

more

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6
Q

What is resolving power?

A

degree of definition of the fine structure of the material being observed (ability to separate 2 continuous objects)

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7
Q

What is refractive index?

A

the degree to which light bends through a medium

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8
Q

What are the three major parts of flagellum?

A

basal body, hook, and filament

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9
Q

What is the basal body?

A

a rod and a series of stabilizing rings that imparts rotation (motor of the flagellum)

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10
Q

What is the hook?

A

curved, flexible part extending from the basal body

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11
Q

What is the filament?

A

End of the flagellum, part that rotates

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12
Q

What is a peritrichous bacterium?

A

has flagella around the entire cell

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13
Q

What is a lophotrichous bacterium?

A

has flagella at one or both ends of the cell

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14
Q

What is a monotrichous bacterium?

A

has 1 flagella at one pole of the cell

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15
Q

What is a amphitrichous bacterium?

A

has 2 flagella, one at each end of the cell

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16
Q

What part of the flagella is in the cell envelope?

A

basal body

17
Q

What part of the flagella is at the cell-surface?

A

hook

18
Q

What part of the flagella extends into the environment?

A

filament

19
Q

What is dark field microscopy used to observe?

A

living unstained microorganisms; examining very thin and distinctly shaped bacteria

20
Q

What is phase-contrast microscopy used to observe?

A

living unstained cells against a background of similar optical density; bacteria motility, and bacterial structures like endospores, mircocompartments, and storage inclusions

21
Q

What are 2 techniques often used to isolate a microorganism from a culture medium?

A

streak plate method and drop-dilution

22
Q

What is a culture medium?

A

A medium that has favorable growth conditions for a particular type of microbe

23
Q

What is agar?

A

a complex polysaccharide that is used as a solidifying agent in preparation of culture media

Micro (15 decks)

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