Question paper 1.pptx
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This document contains short notes on the differences between gram-positive and gram-negative cell walls, R- plasma, bacterial growth curves, and the differences between innate and acquired immunity. It also contains 5 multiple choice questions regarding Corynebacterium diphtheriae pathogenesis, obligate intracellular bacteria, the highest useful magnification of a light microscope, enriched media, and the best phase of bacterial growth to obtain toxins.
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The document is the exam for BIOL 2250 Microbiology for Health Sciences. It contains 23 multiple choice questions and 6 true/false questions worth a total of 100 points. Students are instructed to mark their answers on the scantron sheet and test itself. They are also told to ask for clarification on any unclear questions to receive credit.
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2.D) Ingesting the bacteria and cell debris through phagocytosis because the neutrophils are the
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1.C) Bacteria typically transmitted by airborne droplets because these gram positive bacteria can
spread via the droplets expelled from a Sterptococcus pyogenes infected person.
2.D) Ingesting the bacteria and cell debris through phagocytosis because the neutrophils are the
white blood cells that are in the first line of defence as an innate immune response that comes to
site of infection(Tissues & Blood circulation) throught he chemoattractants produced by the
streptococcus pyogenes.
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polysaccharide such as found in the cell wall and lectin binding with mannose on the bacterial
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CASE ANSWERS:
1.C) Bacteria typically transmitted by airborne droplets because these gram positive bacteria can
spread via the droplets expelled from a Sterptococcus pyogenes infected person.
2.D) Ingesting the bacteria and cell debris through phagocytosis because the neutrophils are the
white blood cells that are in the first line of defence as an innate immune response that comes to
site of infection(Tissues & Blood circulation) throught he chemoattractants produced by the
streptococcus pyogenes.
3.The following statements about the antibody productions is TRUE :
B) Antibodies are produced by B cells with the help of T helper 2 cell.
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CASE ANSWERS:
1.C) Bacteria typically transmitted by airborne droplets because these gram positive bacteria can
spread via the droplets expelled from a Sterptococcus pyogenes infected person.
2.D) Ingesting the bacteria and cell debris through phagocytosis because the neutrophils are the
white blood cells that are in the first line of defence as an innate immune response that comes to
site of infection(Tissues & Blood circulation) throught he chemoattractants produced by the
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B) Antibodies are produced by B cells with the help of T helper 2 cell..
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1. C. Clostridium perfringens causes myonecrosis; Clostridium perfr.pdf
1. C. Clostridium perfringens causes myonecrosis; Clostridium perfringens is a soil born
bacteria which produce exotoxin and cause this myonecrosis.
2. D. Intact skin, flushing action of the urinary tract and cytokines are non-specific means of
defense against invasion by microbes.
3. D. Complement is activated by an interaction between antibody and antigen, a microbial
polysaccharide such as found in the cell wall and lectin binding with mannose on the bacterial
cell surface.
4. C. Naturally acquired passive immunity is a type of immunity is transferred from mother to
fetus across the placenta.
5. A. Endotoxins are produced by gram negative bacteria which is a lipopolysaccharide and is
heat stable.
6. C. Adherence of organism to the tissue may not cause disease.
7. D. Flora of the skin includes Corynebacteria spp (diptheroids), Propionibacterium acnes and
Staphylococcus spp.
Solution
1. C. Clostridium perfringens causes myonecrosis; Clostridium perfringens is a soil born
bacteria which produce exotoxin and cause this myonecrosis.
2. D. Intact skin, flushing action of the urinary tract and cytokines are non-specific means of
defense against invasion by microbes.
3. D. Complement is activated by an interaction between antibody and antigen, a microbial
polysaccharide such as found in the cell wall and lectin binding with mannose on the bacterial
cell surface.
4. C. Naturally acquired passive immunity is a type of immunity is transferred from mother to
fetus across the placenta.
5. A. Endotoxins are produced by gram negative bacteria which is a lipopolysaccharide and is
heat stable.
6. C. Adherence of organism to the tissue may not cause disease.
7. D. Flora of the skin includes Corynebacteria spp (diptheroids), Propionibacterium acnes and
Staphylococcus spp..
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I made this quiz to help enhance your knowledge and also my knowledge, hence I could be a doctor someday :D. That's a joke, I want to be a scientist some day not a doctor, but I am learning these things because it is one of the requirements for being a SCIENTIST!
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This document describes procedures for isolating, quantifying, and identifying bacteriophage from samples. It discusses the eclipse and latent periods of phage growth and viral yield. Methods are provided for amplifying phages from a sample by allowing infection of a host bacteria, then isolating and counting phages using plaque assays to determine plaque forming units per ml. Plaque assays involve serial dilutions of phages, mixing with host bacteria, and observing zones of cell lysis to identify and isolate distinct phages.
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www.StokeNewingtonHistory.com
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