Medical Laboratory Scientist ASCP Practice Exam 2025 – Complete Study Guide

Micrococcus luteus is primarily distinguished by its resistance to furazolidone. This characteristic is particularly significant in differentiating Micrococcus species from other bacteria, such as Staphylococcus species, which may show varying sensitivity to this antibiotic. The resistance pattern displayed by Micrococcus luteus is useful in laboratory identification and aids in confirming its status as a frequently encountered skin commensal and contaminant.

In the context of the other options, Micrococcus luteus generally demonstrates sensitivity to both novobiocin and bacitracin, which are often used in clinical settings to differentiate between various microbial pathogens. Additionally, Micrococcus luteus does not possess the ability to ferment lactose, which is relevant for identifying and categorizing other organisms in microbiological assays. Therefore, the resistance to furazolidone becomes a key identifier for this organism in microbiological diagnostics.