How do we classify bacteria based on shape?
Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow.
What are the 3 shapes of bacteria and describe how they look?
Individual bacteria can assume one of three basic shapes: spherical (coccus), rodlike (bacillus), or curved (vibrio, spirillum, or spirochete). Considerable variation is seen in the actual shapes of bacteria, and cells can be stretched or compressed in one dimension.
What is the basis for classification of bacteria?
Bacteria can be classified on the basis of cell structure, cellular metabolism or on differences in cell components, such as DNA, fatty acids, pigments, antigens and quinones.
How would you describe bacteria under a microscope?
In order to see bacteria, you will need to view them under the magnification of a microscopes as bacteria are too small to be observed by the naked eye. Most bacteria are 0.2 um in diameter and 2-8 um in length with a number of shapes, ranging from spheres to rods and spirals.
How do we identify bacteria?
Bacteria are identified routinely by morphological and biochemical tests, supplemented as needed by specialized tests such as serotyping and antibiotic inhibition patterns. Newer molecular techniques permit species to be identified by their genetic sequences, sometimes directly from the clinical specimen.
How do you differentiate bacteria?
How do you view bacteria on a compound microscope?
Viewing bacteria under a microscope is much the same as looking at anything under a microscope. Prepare the sample of bacteria on a slide and place under the microscope on the stage. Adjust the focus then change the objective lens until the bacteria come into the field of view.
How do you identify a bacteria?
How are bacteria classified according to their shape?
While a majority of bacteria share these characteristics, they vary in shape which allows different types of bacteria to be classified based on their general shape. The following are the major categories of bacteria based on their shapes: Cocci bacteria appear spherical or oval in shape.
How are bacteria classified on the basis of Gram stain?
Classification of Bacteria. Classification on the basis of gram stain, bacterial cell wall, shape, mode of nutrition, temperature requirement, oxygen requirement, pH of growth, osmotic pressure requirement, number of flagella and spore formation.
How can you study the classification of bacteria?
You can study them in detail in microbiology courses in medicine, pharmacy, and even basic biology. These bacteria are unicellular (single-celled) organisms and are of microscopic and invisible to the naked eye. The bacterial classification is one of the key factors to tackle them in disease.
How is the shape of a cocci bacteria determined?
For the most part, the shape is determined by the cell wall of the organism and therefore varies from one type of cocci bacteria to another. Cocci bacteria may exist as single cells or remain attached to each other.