Multiple choice Which of the following are the three types of bacteria that can be pathogenic? round, rod, cork-screw shaped cocci, bacilli, spirilla virus, fungi, protozoa both a & b Reveal answer Fill a bubble to check yourself D Correct answer Explanation Pathogenic bacteria are classified by shape: cocci (round), bacilli (rod), and spirilla (corkscrew). Since both the descriptive names and the technical names are correct, option D is the best choice.