Micro, Unit I Notes

Micro, Unit I Notes - 1 Microbiology Unit 1 Introduction To...

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1 Microbiology Unit 1 Introduction To Clinical Microbiology: Chapter One 1. What are the 4 groups of microbes? viruses bacteria fungi parasites “worms” Which of these are studied in this course? fungi bacteria 2. What is the minimum size of objects that can be seen (resolved) with the compound microscope? less than 200 nm cannot be seen with a light microscope = 0.2 microns 3. Which microbes cannot be seen with the compound light microscope ? less than 200 nm cannot be seen with a light microscope – viruses FYI human RBC ~ 7 microns 4. Are viruses cellular? they are not cellular – have either DNA or RNA (not both), are enclosed in a protein coat with or without a lipid membrane coat – are true parasites Are they living? unknown 5. Bacteria are in the Kingdom Monera (also known as Procaryotae ) 6. What are the cellular characteristics of procaryotic cells (bacteria)? simple unicellular organism – no nuclear membrane, mitochondria, Golgi bodies, or ER (no membrane bound organelles) have no nucleus – have nucleoid have 1 chromosome – loop DNA = same DNA as in eukaryotes – double stranded in loop size: 0.2 – 10 microns (average) reproduce by asexual division have cell wall FYI PCN inhibits formation of the cell wall How are species determined? humans arbitrarily assign species in bacteria 7. Do all bacteria have a cell wall? some lack the cell wall—compensate by surviving inside host cells or in a hypertonic environment bacteria frequently live in a hypertonic environment 8. What is the function of a cell wall? to protect it from bursting in a hypotonic environment 9. What are the basic shapes of bacterial cells? spheres rods spirals 10. Normal flora are those microbes that normally live on the body. All humans share a relatively common set of normal flora microbes. examples: Staphylococcus epidermidis: on skin Staphylococcus aureus: in mucous membranes
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2 11. Fungi are in the Kingdom Mycetae. The fungal cell wall contains chitin and cellulose. What are the characteristics of the fungi? eukaryotic contain well-defined nucleus, mitochondria, Golgi bodies, and ER can exist in unicellular form (yeast) – replicate asexually can exist in filamentous form (mold) – replicate asexually and sexually some can assume either morphology – dimorphic 12. Unicellular parasites are in the Kingdom Protista. The entire group called “parasites” includes many multicellular animals. (worms and flukes etc. ) of the Kingdom Animalia. What are the characteristics of the Animal Kingdom? most complex eukaryotic some are unicellular some are multicellular range in size from 1-2 micrometers to 10 meters in length complex life cycles 13. Plants are in the Kingdom Plantae. How are plants different from animals? plants
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Micro, Unit I Notes - 1 Microbiology Unit 1 Introduction To...

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