Microbiology Written Report Bacteria
Morales, Marinel M. Dr. Annie Cu Gallardo
BSE-Biological Sciences III-3 Microbiology (Lecture) Microbiology Written Report
REPORT NO. 1
Prokaryotes: Bacteria Most of us have been conditioned to think of bacteria as invisible, potentially harmful little creatures. Actually, relatively few species of bacteria cause disease in humans, animals, plants, or any other organisms. In fact, all organisms made up of eukaryotic cells probably evolved from bacteria-like organisms, which were some of the earliest forms of life. In this chapter, we will learn how bacterial groups are differentiated from each other and how important bacteria are in the world of microbiology. The discussion emphasizes bacteria that are considered to be of practical importance, those important in medicine, or those that illustrate biologically unusual or interesting principles.
Etymology of Bacteria: The word bacteria is the plural of the New Latin bacterium, which is the latinisation of the Greek βακτήριον (bakterion), the diminutive of βακτηρία (bakteria), meaning "staff, cane", because the first ones to be discovered were rod-shaped.
Origin and Early Revolution: The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about 4 billion years ago. For about 3 billion years, all organisms were microscopic, and bacteria and archaea were the dominant forms of life.
Morphology:
Bacteria display a wide diversity of shapes and sizes, called morphologies. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. However, a few species — for example, Thiomargarita namibiensis and Epulopiscium fishelsoni — are up to half a millimetre long and are visible to the unaided eye; E. fishelsoni reaches 0.7 mm. Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometres, as small as the largest viruses. Some bacteria may be even smaller,
BSE-Biological Sciences III-3 Microbiology (Lecture) Microbiology Written Report
REPORT NO. 1
Prokaryotes: Bacteria Most of us have been conditioned to think of bacteria as invisible, potentially harmful little creatures. Actually, relatively few species of bacteria cause disease in humans, animals, plants, or any other organisms. In fact, all organisms made up of eukaryotic cells probably evolved from bacteria-like organisms, which were some of the earliest forms of life. In this chapter, we will learn how bacterial groups are differentiated from each other and how important bacteria are in the world of microbiology. The discussion emphasizes bacteria that are considered to be of practical importance, those important in medicine, or those that illustrate biologically unusual or interesting principles.
Etymology of Bacteria: The word bacteria is the plural of the New Latin bacterium, which is the latinisation of the Greek βακτήριον (bakterion), the diminutive of βακτηρία (bakteria), meaning "staff, cane", because the first ones to be discovered were rod-shaped.
Origin and Early Revolution: The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about 4 billion years ago. For about 3 billion years, all organisms were microscopic, and bacteria and archaea were the dominant forms of life.
Morphology:
Bacteria display a wide diversity of shapes and sizes, called morphologies. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. However, a few species — for example, Thiomargarita namibiensis and Epulopiscium fishelsoni — are up to half a millimetre long and are visible to the unaided eye; E. fishelsoni reaches 0.7 mm. Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometres, as small as the largest viruses. Some bacteria may be even smaller,