Robert Koch and His Colleagues First Used Agar in Bacteriological

question 47

Multiple Choice

Robert Koch and his colleagues first used agar in bacteriological media.Why was this ingredient an improvement on previous materials used to culture bacteria?

• A)Agar can convert from liquid to solid form, and back again, very easily.
• B)Agar is a complete source of nutrients for most bacteria.
• C)Bacteria growing on the solidified medium did not degrade or break down the agar.
• D)Agar was less expensive than the nutrients that Koch was previously using in the lab.

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Definitions:

Primary Dye

A dye used initially in a staining procedure that provides the main coloration for microscopic tissue examination.

Chain-Of-Custody

The documented process or paper trail that records the sequence of custody, control, transfer, analysis, and disposition of materials or samples.

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The harmful or hazardous use of psychoactive substances, including alcohol and illicit drugs.

Hematuria

Blood in the urine.