Bacteria & other Microorganisms Dr. Zaheer Ahmed Chaudhary Associate Professor Microbiology Department of Pathology.

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Presentation transcript:

Bacteria & other Microorganisms Dr. Zaheer Ahmed Chaudhary Associate Professor Microbiology Department of Pathology

Causative agents & their Classification Bacteria– Prokaryotic kingdom Fungi – Protists kingdom(uni-multi) Protozoa– Protists kingdom Helminths– Animal kingdom Viruses– Replicates only with in cells Helminth and protozoa are called parasites.

Features of microorganisms Bacteria, fungi, helminths and protozoa are cellular where as viruses are not. Distinction is based on structure, chemical composition, bio-synthetic and genetic organization. 1) Structure: Cell has nucleus with DNA surrounded by cytoplasm within which proteins are synthesized for energy.

Viruses have inner core of genetic material DNA or RNA but no cytoplasm. They are dependent on host cells for energy and protein synthesis. 2) Replication: Prokaryotics i.e. bacteria replicate by binary fission, and eukaryotics divide by mitosis.

Binary Fission in Bacteria

Viruses disassemble, produce many copies of their nucleic acid, proteins and then reassemble into multiple progeny viruses within the host cell. 3) Nucleic acid: Cells contain both DNA and RNA while viruses contain either of the two.

Types of Cells Prokaryotic- bacteria Eukaryotics- Helminths, fungi and protozoa. Eukaryotics have true nucleus with multiple chromosomes and surrounded by cell membrane, divide by mitosis. Prokaryotics have nucleoid consisting of single circular molecule of DNA without nuclear membrane and mitotic apparatus.

Eukaryotics contain organelles e.g. mitochondria, lysosomes, and large ribosome (80S). Prokaryotics contain no organelles and smaller ribosomes(70S). Comprised of 30 and 50 sub units. Eukaryotics do not have peptidoglycan in their cell wall and bounded by a flexible cell membrane or in case of fungi a rigid cell wall with chitin (homopolymer of N.acetylglucosamin).

Prokaryotics have a rigid external cell wall containing of peptidoglycan i.e. the polymer of amino acid plus sugar. Eukaryotics cell membrane contains sterols. Prokaryotics do not have cell membrane except wall less Mycoplasma which contains sterols. Prokaryotics are haploid with single chromosome.

Eukaryotics have diploid chromosomes. Most protozoa and some bacteria are motile while fungi and viruses are non-motile. Protozoa possess three different organs for locomotion i.e. flagella, cillia and pseudopodia Motile bacteria only move by flagella.

Flagella

Comparison of Medically Important Organisms

Characteristics of Pro & Eu-karyotic Cells

Viruses Are not cells and not visible with light microscope. Are obligate intracellular parasite. Contain no organelles and biosynthetic machinery. Contain only DNA or RNA. Are called bacteriophage if the host is a bacteria.