Microbiology Overview
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Microbiology Overview - Details
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52 questions
| 🇬🇧 | 🇬🇧 |
| Viruses, bacteria, fungi, protozoa and some algae | Microorganisms |
| Microbiological, chemical, physical, allergenic | Types of Hazards (4) |
| Vet drugs, cleaning materials, food additives, pesticides | Chemical Hazard Examples |
| Infectious bacteria, toxin producing organisms, spoilage bacteria, yeasts, moulds | Microbiological Hazard Examples |
| Metal, glass, dead insects, hair | Physical hazards examples |
| 1µm (micrometre) = 10-3 mm | Unit of Measurement for bacteria |
| Cocci (spherical), Bacilli (rod shaped), Spiral bacteria (twisted) | Three shapes of bacteria |
| 1 µm Spherical | Cocci bacteria |
| Twisted shape 1-3 µm in length, 0.3-0.6 µm width | Spiral bacteria |
| Can assume several shapes | Pleomorphic bacteria |
| Diplococci | Cocci that remain in pairs after dividing |
| Streptococci | Cocci that remain in chains after dividing |
| Tetrads | Cocci that divide in two planes and remain in groups of four |
| Sardinae | Cocci that divide in three planes and remain in groups as a cube of 8 |
| Staphylococci | Cocci that divide in multiple planes- grape like clusters |
| Bacilli that appear in pairs after division | Diplobacilli |
| Appear in chains after division | Streptobacilli |
| Short and fat so appear like cocci | Coccobacilli |
| Helical shape and rigid bodies | Spirilla |
| Helical shape and flexible bodies. Move by means of axial filaments (which look like flagella) | Spirochetes |
| Cell wall, cell membrane, cytoplasm, nuclear material | Essential stricture of bacteria (4) |
| Capsule, flagella, pili, spore | Other structures of bacteria (4) |
| Cell walls contain many layers of peptidoglycan and contain teichoic acids | Gram Positive bacteria |
| Multiple layers found in gram positive bacteria. Single of thin layer in gram negative. | Peptidoglycan |
| Only found in gram positive bacteria | Teichoic acids |
| Have a lipopolysaccharide-lipoprotein-phospholipid outer membrane surrounding a thin/single peptidoglycan layer. | Gram negative bacteria |
| Mass of hyphae | Mycelium |
| Mould growth, hyphae extends at the tip | Apical growth |
| Mould growth, hypha extend within their length | Intercalary Growth |
| Mycotoxins and aflatoxins | Mould toxins |
| Have no known sexual state in their life cycle | Deuteromycetes or fungi Imperfecti |
| Making beer, wine, spirits, bread and fermented foods. Produces carbon dioxide, alcohol and/or organic acids | Yeast use in food production |
| Pathogenic fungi have 2 forms. Moulds at ambient temperatures and yeasts and body temperatures. | Dimorphism |
| 1.Bacteria have the shortest generation time compared to yeasts and moulds. 2. Some bacteria more heat resistant than Y&M 3.Y&M can grow at low pH and low Aw and under high osmotic pressure | Differences between bacteria, yeasts and moulds (3) |
| The minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane | Osmotic Pressure |
| Acellular, obligate intracellular parasites (need a ‘host’), no ATP generating system, no ribosomes or means of protein synthesis. | Viruses (4 points) |
| DNA or RNA (never both), Capsid (coat protein). Some viruses: envelope or enzymes | Virus Structure (2 main, 2 optional) |
| >50% | The Peptidoglycan layer accounts for what percentage of the dry weight of cell wall in many gram-positive bacteria. |