Which term denotes a cylindrical or rod-shaped bacterium?

Which term denotes a cylindrical or rod-shaped bacterium?

• A. Bacillus
• B. Bacteria
• C. Antibody
• D. Aseptic Technique

Answer: (A)

A cylindrical or rod-shaped bacterium is described as bacillus. This shape-based term distinguishes rod-like bacteria from cocci (spherical) and spirilli (spiral). While the genus Bacillus includes some rod-shaped species, the general shape designation remains bacillus for a single organism and bacilli for multiple. The other options refer to broader categories or unrelated concepts (bacteria is the broad group of these organisms, antibodies are immune proteins, aseptic technique is about preventing contamination).

A cylindrical or rod-shaped bacterium is described as bacillus. This shape-based term distinguishes rod-like bacteria from cocci (spherical) and spirilli (spiral). While the genus Bacillus includes some rod-shaped species, the general shape designation remains bacillus for a single organism and bacilli for multiple. The other options refer to broader categories or unrelated concepts (bacteria is the broad group of these organisms, antibodies are immune proteins, aseptic technique is about preventing contamination).