Microbiology
Bacteria
Bacteria are single-celled, prokaryotic microorganisms that lack a nucleus and membrane-bound organelles. They exhibit diverse shapes, including spherical (cocci), rod-shaped (bacilli), and spiral (spirilla), and are found in virtually every environment on Earth, from soil and water to extreme habitats like acidic hot springs and radioactive waste.
Streptococcus
Streptococcus is a genus of Gram-positive, spherical bacteria that typically form chains or pairs. These bacteria are facultative anaerobes and are known for their diverse roles, ranging from commensal organisms in the human microbiota to significant pathogens responsible for various diseases.