Final answer:
The most common type of bacterial cell is bacilli, which are rod-shaped cells.
Step-by-step explanation:
The most common type of bacterial cell is bacilli, which are rod-shaped cells. They are one of the three basic categories of prokaryotic cells, along with cocci (spherical cells) and spirilli (spiral-shaped cells). Bacilli cells typically have cell walls enclosing cell membranes, and they may have structures like flagella for locomotion and pili for attachment.