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Rod-shaped bacteria are classified as:

  1. Cocci

  2. Bacilli

  3. Spirilla

  4. Vibrio

The correct answer is: Bacilli

Rod-shaped bacteria are classified as bacilli. This classification stems from the morphology of these bacteria, where "bacilli" specifically refers to forms that are cylindrical or elongated, resembling rods. Understanding bacterial shapes is fundamental in microbiology and helps in the identification and classification of different bacterial species. Cocci refers to bacteria that are spherical in shape, while spirilla denotes spiral-shaped bacteria, which are characterized by their winding or corkscrew-like form. Vibrio describes bacteria that have a curved or comma-like shape. By recognizing these distinct classifications of bacteria, one can determine not only their form but also their potential functions and behaviors in various environments, thus assisting in both research and clinical settings.