Oscillatoria – Classification, Occurrence, Structure and Reproduction. Which is the best description of the Oscillatoria? They can exist as single cells, in pairs, chains or clusters. What is the shape of a bacteria?īacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). Most bacteria come in one of three basic shapes: coccus, rod or bacillus, and spiral. What is the most common shape of bacteria? Filaments in the colonies can slide back and forth against each other until the whole mass is reoriented to its light source. Oscillatoria is a genus of filamentous cyanobacterium which is named after the oscillation in its movement. ![]() Therefore, Nostoc, Oscillatoria, and Mycobacterium are prokaryotes. Nostoc and Oscillatoria are cyanobacteria they are a group of photosynthetic and nitrogen-fixing bacteria, and Mycobacterium comes under true bacteria. (Gram was the microbiologist who devised the staining method.) These two groups are then subdivided into gram-positive and gram-negative bacteria. The two main groups of bacteria are cocci (spherical-shaped) and bacilli (rod-shaped) (Brooker 2008). In the Got It? section, you will review all five shapes and three ways bacteria organize by groups, while making a slide show presentation.Bacteria are classified according to their shape. This makes it easier and quicker for medical personnel to identify what bacteria may be infecting a person. Why is it important for doctors to be able to use these methods to identify bacteria?īacteria are classified by their shape and how they organize themselves into groups.(If you didn't print out this resource in Lesson One, please download and print it from Downloadable Resources in the right-hand sidebar.)īacteria Classification by Shape, by Biology Professor: Use the illustration below to check to see if you were correct:įill in the blanks and answer the questions for Lesson Six, B acterial Shape Classification, in your Viruses and Bacteria Unit Workbook, as you watch the video on bacteria classification below. What do you think a chain of coccus would be called?.What would a pair of bacillus-shaped bacteria be called?Ī chain of bacillus is called streptobacilli.The prefix Strepto- means in chains, which means that the bacteria come together in straight lines.Ī pair of coccus-shaped bacteria would be called diplococcus. The prefix Staphylo- refers to grape-like, which means they come together in clusters. The prefix Diplo- means two, which means they come together in pairs. ![]() The image below shows six of the more common shapes:īacteria are also classified by organization in groups. The most common shapes are the coccus, bacillus, and spirillum, but there are many more bacterial shapes overall. Bacteria can be classified two ways: by shape and by organization in groups. ![]() Doctors and researchers were able to identify the bacteria and implement treatment plans.īefore moving on, if you missed, or need to review, the previous five Related Lessons in this Viruses and Bacteria series, find them in the right-hand sidebar.īacteria are mighty little microbes that come in many shapes, which allows doctors and researchers to quickly identify the more common bacterial diseases. When people came in contact with the contaminated water, they became infected. Vibrio cholerae bacteria are found in brackish water. The medical personnel quickly realized it was cholera, caused by the bacteria vibrio cholerae.
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