Pathogenic Microorganisms - 222 PHARM
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Questions and Answers

Which of the following statements about microbiology is correct?

  • Microbiology deals with organisms that can be observed with the naked eye.
  • Microbiology focuses solely on viruses and their structures.
  • Microbiology includes only those microorganisms that cause disease.
  • Microbiology encompasses the study of microorganisms that cannot be seen without specialized equipment. (correct)
  • Which group of microorganisms is classified as prokaryotes?

  • Fungi
  • Bacteria (correct)
  • Algae
  • Protozoa
  • What percentage of microorganisms are considered beneficial?

  • 70-80%
  • 50-60%
  • 100%
  • 95-97% (correct)
  • Which of the following is an acellular infectious agent?

    <p>Viruses (B)</p> Signup and view all the answers

    Which classification is used to group organisms according to the type of cell?

    <p>According to kingdoms (B)</p> Signup and view all the answers

    Which of the following is characteristic of eukaryotic cells?

    <p>True nucleus with a nuclear membrane (D)</p> Signup and view all the answers

    What best describes the respiration process in prokaryotic cells?

    <p>Utilizes cytoplasmic membrane (B)</p> Signup and view all the answers

    How do prokaryotic cells divide?

    <p>Binary fission (A)</p> Signup and view all the answers

    Which statement correctly distinguishes archaebacteria from eubacteria?

    <p>Archaebacteria lack peptidoglycan in their cell walls (C)</p> Signup and view all the answers

    What is one key difference in the ribosome sizes of prokaryotic and eukaryotic cells?

    <p>Prokaryotic ribosomes are 70S (B)</p> Signup and view all the answers

    Which of the following types of cells can be unicellular?

    <p>Both prokaryotic and eukaryotic organisms (D)</p> Signup and view all the answers

    What feature is commonly absent in eukaryotic cells compared to prokaryotic cells?

    <p>Peptidoglycan (C)</p> Signup and view all the answers

    Which domain includes organisms such as animals and fungi?

    <p>Eukarya (D)</p> Signup and view all the answers

    What defines the number of chromosomes in prokaryotic cells?

    <p>Single circular chromosome without histones (B)</p> Signup and view all the answers

    What aspect of eukaryotic cells allows for greater complexity compared to prokaryotic cells?

    <p>Possession of a true nucleus (D)</p> Signup and view all the answers

    Flashcards

    What is Microbiology?

    Microbiology is the scientific field that studies microorganisms, which are living things too small to be seen with the naked eye.

    Microbial World

    The microbial world encompasses all the microbes, including bacteria, algae, fungi, protozoa, and helminths.

    Classification of Microorganisms

    Microorganisms are classified into two main groups: prokaryotes and eukaryotes.

    Prokaryotes

    Prokaryotes are simple cells lacking a nucleus and other membrane-bound organelles, like bacteria.

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    Eukaryotes

    Eukaryotes are complex cells with a nucleus and other membrane-bound organelles, like fungi, algae, and protozoa.

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    Prokaryotic Cell

    A cell that lacks a true nucleus and other membrane-bound organelles. They are typically smaller and simpler than eukaryotic cells.

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    Eukaryotic Cell

    A cell that has a true nucleus and other membrane-bound organelles. They are typically larger and more complex than prokaryotic cells.

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    Bacteria

    A group of single-celled organisms that lack a true nucleus and other membrane-bound organelles. They are found in a wide variety of habitats.

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    Archaea

    A group of single-celled organisms that lack a true nucleus and other membrane-bound organelles. They are often found in extreme environments like hot springs or salty lakes.

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    Peptidoglycan

    A rigid outer layer that surrounds the cell membrane of bacteria. It provides structural support and protection.

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    Sterols

    A type of lipid found in cell membranes. It helps to maintain the stability and fluidity of the membrane.

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    Nucleoid

    A region within a prokaryotic cell where the genetic material (DNA) is located. It is not enclosed by a membrane.

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    Nucleus

    A membrane-bound structure that contains the genetic material (DNA) of a eukaryotic cell. It is the control center of the cell.

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    Organelles

    Specialized structures within a eukaryotic cell that perform specific functions. Examples include mitochondria, chloroplasts, and Golgi apparatus.

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    Chromosomes

    Rod-shaped structures in eukaryotic cells where DNA is wrapped around proteins called histones. They help to organize and compact the DNA.

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    Binary Fission

    The process by which prokaryotic cells divide. It involves a simple duplication of the DNA and splitting of the cell into two daughter cells.

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    Mitosis & Meiosis

    The process by which eukaryotic cells divide. It involves a complex series of steps that ensure the correct distribution of chromosomes to daughter cells.

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    Respiration

    The process of breaking down food molecules to release energy. In prokaryotes, it occurs at the cell membrane, while in eukaryotes, it occurs in the mitochondria.

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    Three Domain System

    The three-domain system classifies life into three main groups: Bacteria, Archaea, and Eukarya.

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    Study Notes

    Pathogenic Microorganisms - 222 PHARM

    • Topics covered include introduction to microorganisms, objectives, microbiology definition, scope of microbiology, classification of living organisms, prokaryotic and eukaryotic cells, prokaryote vs eukaryote, domains, kingdoms, binomial nomenclature system of classification, bacterial shapes, and bacterial arrangements.
    • Microbiology is the study of very small living organisms (microorganisms, M.O.) that cannot be seen with the naked eye.

    Introduction to Microbial World

    • Microbiology is the study of living things too small to be seen without a microscope.
    • Microorganisms can be beneficial or pathogenic.
    • Microorganisms include bacteria, archaea, fungi, protozoa, algae, and viruses.

    Objectives

    • Define microorganisms and the scope of microbiology.
    • Understand the microbial world and microbial classification.
    • Differentiate prokaryotes and eukaryotes.
    • Describe various types, shapes, and arrangements of microorganisms under a microscope.

    What is Microbiology?

    • Microorganisms (M.O) are too small to see.
    • Microbiology studies M.O,
    • Most microbes are beneficial,
    • Medical microbiology studies disease-causing microbes.

    Scope of Microbiology

    • Infectious agents – includes bacteria, fungi, protozoa, helminths and viruses.
    • Viruses are acellular, non-living agents.

    Classification of Living Organisms

    • Based on cell type (prokaryotic/eukaryotic)
    • Based on domains (Woese et al. 1990) -> Bacteria, Archaea, Eukarya.
    • Based on kingdoms (Cavalier-Smith 2000) -> example Archaebacteria,Eubacteria, Animalia, Plantae,Eumycota, Protista, Chromista.

    Prokaryotic & Eukaryotic Cells

    • Prokaryotic cells lack a nucleus and other membrane-bound organelles.
    • Eukaryotic cells have a nucleus and membrane-bound organelles. (Visual aid included)

    Prokaryote vs. Eukaryote

    • Key differences in cell structures and organization. (Data Table included)

    Domains

    • Three domains exist: Bacteria, Archaea, Eukarya.

    Kingdoms

    • Six (or seven) kingdoms of living organisms are present. Examples include : Archaebacteria, Eubacteria, Animalia, plantae, fungi, protista, Chromista.

    Binomial Nomenclature System

    • Organisms are named using a two-part naming system: Genus species (e.g., Staphylococcus aureus).
    • Genus is capitalized and species is lowercase.
    • Both are italicized.
    • Genus can be abbreviated (e.g., E. coli).

    Bacterial Shapes

    • Three basic shapes: Bacilli (rod-shaped), Cocci (spherical), Spiral (helical).
    • Some bacteria are pleomorphic—meaning their shape varies.

    Bacterial Arrangements

    • Cocci can arrange in various patterns (e.g., diplococci, streptococci, tetrads)
    • Bacilli can arrange in patterns (e.g., single, pairs). (Visual representation of arrangements included)

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    Description

    Explore the fascinating world of microorganisms with this quiz on pathogenic organisms. It covers essential topics such as the classification of living organisms, the differences between prokaryotic and eukaryotic cells, and the various shapes and arrangements of bacteria. Perfect for pharmacy students looking to enhance their microbiology knowledge!

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