This document summarizes the morphology and structure of bacterial cells. It describes the various shapes bacteria can take, including spherical, elongated rods, spirals, and arrangements of cocci and rods. The sizes of different bacteria are provided, generally ranging from 0.2 to 10 micrometers. Details are given on the bacterial cell wall, cell membrane, and differences between Gram-positive and Gram-negative cell walls. Gram staining is explained as a method to distinguish between these types. Examples of common Gram-positive and Gram-negative microbes are listed. The document concludes with sensitivity of these groups to different antibiotics.