Exam 4: Microscopy, Staining, and Classification

You are examining a bacterial smear on a light microscope. You observe pinkish-red bacilli and blue cells of various shapes. You are probably looking at a smear prepared with the ________ stain.

Tungsten is a reagent used in the

Viruses are generally measured in

You are a scientist studying the highly specific interactions of bacteriophages with their host cells when they first encounter the cell. Discuss what microscope(s) and preparation procedures you might use for this study.

Three-dimensional images of specimens can be obtained using scanning electron microscopes.

An important function of nomenclature is to

A (decolorizer/mordant/fixer) is a substance that binds to a dye and makes it less soluble.

The kingdoms included in the Linnaeus system of classification are

Why are modern light microscopes better than the ones Leeuwenhoek used?

Which of the following statements about transmission electron microscopy is CORRECT?

The ________ stain makes use of malachite green.

A resolution of 1 μm would be better than a resolution of 0.5 μm.

The total magnification using a 10 ocular and a 100 objective would be (110/1000/10000)×. (Be sure your answer is a numeral.)

All of the following are common to both the Gram stain and the acid-fast stain EXCEPT

PCR is a method for identifying microbes based on their (antigens/genes/morphology).

The placement of an organism into a domain is made on the basis of

The resolution of a microscope is a function of the ________ of the lenses and the ________ of light.

Specimens are visible on a phase contrast microscope because they refract the light that illuminates them.

A(n) (acidic/metallic/fluorescent) molecule is one that absorbs invisible radiation and emits visible light.

All types of radiation are used for microscopy.