Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam 2025 - Free Sterile Processing Technician Practice Questions and Study Guide

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Gram-Negative Bacilli are characterized by which shape?

Round-shaped

Coccoid

Rod-shaped

Gram-negative bacilli are characterized by their rod-shaped structure. This unique shape is pivotal in identifying and classifying bacteria, particularly in microbiology. The term "bacilli" specifically refers to rod-shaped bacteria, and the distinction as "gram-negative" indicates that these bacteria do not retain the crystal violet stain used in the Gram staining procedure, taking on a pink color instead due to the counterstain, typically safranin.

In contrast, round-shaped organisms are categorized as cocci, which do not fall under the bacilli classification. Coccoid shapes refer to spherical bacteria, while spiral-shaped bacteria, termed spirilla or spirochetes, have a twisted or helical appearance. Therefore, the unique rod-shaped structure of Gram-negative bacilli is essential in diagnosing infections and understanding the organism's characteristics in clinical settings.

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Spiral-shaped

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