PPT NI BASAS Flashcards

1
Q

The objective lens
forms the magnified

A

real image

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2
Q

image is
a product of the
separate magnifying
powers of the two
lenses

A

Total magnification

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3
Q

Numerical aperture of lens ranges from

A

0.1 to 1.25

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4
Q

formula for quantifying resolution

A

RP = wavelength of light in nm/2x numerical aperture of objective lens

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5
Q

Oil immersion objectives resolution is

A

0.2

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6
Q

In order to get the best resolution possible with a
light microscope, you would want:

A. Long wavelengths of light

B. Short wavelengths of light

C. The wavelength doesn’t affect resolution

A

B

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7
Q

when a specimen is
darker than surrounding field and used used for live and
preserved stained specimens, what type of microscope is this

A

Bright-field

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8
Q

best for observing
intracellular structures

A

phase contract

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9
Q

this microscope is useful in diagnosing
infections

A

fluorescence microscope

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10
Q

electron micro scopes magnification is about

A

5,000X and 1,000,000X

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11
Q

Darker areas represent
thicker, denser parts
and lighter areas
indicate more
transparent, less dense
parts. what type of microscope is this

A

transmission

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12
Q

allow examination of characteristics of live
cells: size, motility, shape, and arrangement

A

wet mounts and hanging drop mounts

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13
Q

are made by drying and
heating a film of specimen.

A

fixed mounts

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14
Q

cationic,
positively charged
chromophore

A

basic dyes

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15
Q

surfaces of microbes are
negatively charged and
attract basic dyes

A

positive staining

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16
Q

anionic,
negatively charged
chromophore

A

acidic dyes

17
Q

microbe repels dye, the
dye stains the
background

A

negative staining

18
Q

one dye is used; reveals
shape, size, and arrangement

A

simple stains

19
Q

use a primary stain and a
counterstain

A

differential stains

20
Q

reveal certain cell parts not
revealed by conventional methods: capsule and
flagellar stains

A

structural stains

21
Q

what are the 6 I of culturing microbes

A

Inoculation
Isolation
Incubation
Inspection
Information gathering
Identification

22
Q

If an individual bacterial cell is separated from other
cells and has space on a nutrient surface,

A

isolation

23
Q

it is the Checking for contaminants (unknown or unwanted
microbes) in the culture.

A

inspection

24
Q

Media is classified into 3 properties

A

Physical state
Chemical composition
Functional type

25
Q

Provides framework to hold
moisture and nutrients most commonly used
solidifying agent

A

Agar

26
Q

what are the 2 most commonly used na media

A

Nutrient broth
Nutrient agar

27
Q

chemical contents of media

A

Synthetic
Complex
General purpose media
Enriched media

28
Q

contains pure organic and inorganic
compounds in an exact chemical formula

A

synthetic

29
Q

contains at least
one ingredient that is not chemically definable

A

Complex

30
Q

grows a broad range
of microbes, usually nonsynthetic

A

general purpose media

31
Q

contains complex organic
substances such as blood, serum, hemoglobin, or

A

enriched media

32
Q

contains
one or more
agents that
inhibit growth of
some microbes
and encourage
growth of the
desired
microbes

A

selective

33
Q

contains a substance
that absorbs oxygen
or slows penetration
of oxygen into
medium; used for
growing anaerobic
bacteria

A

Reducing media

34
Q

contains sugars that
can be fermented,
converted to acids,
and a pH indicator to
show this reaction

A

carbohydrate fermentation