Exam 8: Use of Colony Morphology for the Presumptive Identification of Microorganisms

A microbiologist is reading stool culture plates. She sees an organism that has a dry, pink colony with a surrounding "halo" of pink on MAC. What is a good presumptive identification of this organism?

Colony morphology is defined as

MacConkey (MAC) agar is used to

An upper respiratory specimen contains many indigenous organisms which may be time consuming, cost prohibitive, and insurmountable. What should the microbiologist do?

The elevation of bacterial colonies is described by all the following, except

What organism forms a small, fuzzy-edged colony with an umbonate center on blood or CHOC agar?

All of the following characteristics are used to describe bacterial colony characteristics, except

A microbiologist is reading stool culture plates. She is looking for enteric pathogens on the MAC plate. What do they look like?

The edge of the colonies is described as all the following, except

All of the following terms are used to describe the consistency of a bacterial colony, except