![]() Their physical appearance information is used for bacterial classification. The bacteria are found in different shapes and arrangement. ![]() Leptospira interrogans, Treponema pallidum, Borrelia recurrentis You might think that organisms so small would not have much variety of shape or form, but in fact archaeal shapes are quite diverse. ShapesĬampylobacter jejuni, Helicobacter pylori, Spirillum winogradskyi Rod shape Bacteria Other shapes of bacteria:īacteria are also found in shapes other than spherical and rod. ![]() Haemophilus influenzae, Gardnerella vaginalis and Chlamydia trachomatis Streptobacilli – Bacilli are arranged in chainsĬoccobacilli – short and stumpy, appear like ovoid Sarcina – cubical packets of 8 cell in 3 planesĪrrangement of rod shape bacteria – ArrangementĬoxiella burnetti, Moraxella bovis, Klebsiella rhinoscleromatis Staphylocci – cocci arranged in grapelike cluster Bacteroides Prevotella Porphyromonas Fusobacterium Leptotrichia Also Check: Gram-negative Bacteria. Tetracocci – four cocci arranged in cube like structure Gram-negative Examples of Rod-shaped Bacteria. Moraxella catarrhalis, Neisseria gonorrhpeae Arrangement of Spherical bacteria – Arrangement Download scientific diagram Different shapes of pathogens: rod-shaped and spherical bacteria, as well as viruses. it is called as coccus (in singular) or cocci in plural. The scientists have named such shapes as coccus, bacillus, vibrio, spiral and spirochete respectively. Chapter 65 Comma-shaped Rods Culture Isolation specimen: stool, food Media: blood/charcoal agar with microaerophilic atmosphere (510 O2, 35 CO2), thermophilic environment (optimal 42☌/107.6☏) C. The most common bacterial shapes that have been observed are spherical, rod like, comma, wavy or spiral shape. The difference in shape and size may be due to the difference in habitat, ecology and genetic material. The bacterial population can be distinguished on the basis of physical appearance and hence it is the primary method used for bacterial classification. The study of of bacterial shape, size and arrangements of cells is called as Bacterial Morphology. Whenever we observe them under microscope, we observe their cell shape, arrangement and size. We need microscopes to study and observe them. Due to the microscopic size of the cells, we cannot observe them by naked eyes. They lack nucleus and membrane bound organelles. The Bacteria are unicellular and Prokaryotic cells. The shapes and arrangement of bacteria is used for bacterial classification. Bacteria that use decaying life forms as a source of energy are called saprophytes.The shapes and arrangement of bacteria is called as Bacterial Morphology. Heterotrophs obtain their energy by consuming other organisms. Autotrophs make their own food by using the energy of sunlight or chemical reactions, in which case they are called chemoautotrophs. Occurrence and Distribution of Bacteria: The bacteria constitute a highly specialised group of one-celled plants. Occurrence and Distribution of Bacteria 2. Bacteria can be further divided based on their response to gaseous oxygen into the following groups: aerobic (living in the presence of oxygen), anaerobic (living without oxygen), and facultative anaerobes (can live in both environments).Īccording to the way they obtain energy, bacteria are classified as heterotrophs or autotrophs. The below mentioned article provides a diagram of bacteria along with additional information as follows:- 1. The difference in their cell wall structure is a major feature used in classifying these organisms.Īccording to the way their cell wall structure stains, bacteria can be classified as either Gram-positive or Gram-negative when using the Gram staining. Most bacteria have a peptidoglycan cell wall they divide by binary fission and they may possess flagella for motility. ![]() They exist in four major shapes: bacillus (rod shape), coccus (spherical shape), spirilla (spiral shape), and vibrio (curved shape). The cells are described as prokaryotic because they lack a nucleus. \( \newcommand\)īacteria are unicellular organisms. ![]()
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