Chapter 4

You are viewing an image from a microscope in which the specimens in the smear have more than one color. You are probably looking at:
a) a specimen on a dark-field microscope.
b) a scanning tunneling micrograph.
c) either a specimen stained with a differential stain or fluorescent molecules.
d) a smear stained with a differential stain.
e) a specimen stained with various fluorescent molecules.

In Gram staining, ethanol-acetone is used as a:
a) drying agent
b) primary stain
c) counterstain
d) decolorizing agent.
e) mordant

Acidic dyes are commonly used for ________ stains.
a) negative
b) acid-fast
c) Gram
d) flagellar
e) endospore

Specimens are prepared for ________ microscopy using electron-dense stains.
a) scanning tunneling
b) bright-field
c) confocal
d) transmission electron
e) atomic probe

Images of living specimens can be produced using atomic force microscopes. (TRUE/FALSE)

The resolution of a microscope lens is a function of the lens' (aperture/color/contrast).

Iodine is a (decolorizer/dye/mordant) in the Gram stain procedure.

Which of the following is an incorrect pairing?
a) dark field: high contrast
b) magnification; refraction of radiation
c) electron beams; shorter wavelength
d) contrast; staining techniques
e) numerical aperture; curved glass

Lasers illuminate fluorescent dyes on specimens on ________ microscopes.
a) fluorescent
b) bright-field
c) confocal
d) dark-field
e) phase-contrast

The placement of an organism into a domain is made on the basis of:
a) cell ultrastructure
b) G + C content
c) serological tests
d) ribosomal RNA
e) Gram-stain reactions