Multiple choice What is the shape of Lactobacillus? Rod shape Spherical shape Comma shape Spiral shape Reveal answer Fill a bubble to check yourself A Correct answer Explanation Lactobacillus is a rod-shaped bacterium, as indicated by the suffix 'bacillus' which means rod. Spherical bacteria are called cocci (like Streptococcus), spiral shapes are spirochetes or spirilla, and Vibrio has a comma shape.