Bacteria are single-celled microorganisms with prokaryotic cells, which are single cells that do not have organelles or a true nucleus and are less complex than eukaryotic … See more

Bacteria first arose on Earth approximately 4 billion years ago, and they were the first forms … See more

Bacteria are single-celled organisms. They lack organelles such as chloroplasts and mitochondria, and they do not have the true nucleus found in eukaryotic cells. Instead, their DNA, … See more

Bacteria come in a myriad of shapes. The three main shapes of bacteria are coccus, spiral, and bacillus. Bacteria can also be other shapes such as filamentous (long and thin), squar… See more

The cell wall also makes Gram staining possible. Gram staining is a method of staining bacteria involving crystal violet dye, iodine, and the counterstain safranin. Many bacteria ca… See more