Micro Lab Unit 2 Flashcards.doc - Micro Lab Unit 2 Flashcards 1 Are the dry keratin layers of the skin easily colonized by most microbes 2 What

Micro Lab Unit 2 Flashcards.doc - Micro Lab Unit 2...

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Micro Lab Unit 2 Flashcards 1) Are the dry keratin layers of the skin easily colonized by most microbes? No 2) What substances on skin inhibit the growth of most microbes? sebum from oil and salts (hypertonic water) in perspiration 3) Is the skin a hospitable environment for most microbes? No, it is inhospitable 4) Can all bacteria live on the skin and tolerate the dry keratin and salty perspiration? No, only a few bacteria can; the normal resident microbiota. 5) What is the most common type of bacteria found on the skin? Give an example Gram positive, salt tolerant organisms Staphylococcus aureus, Streptococcus 6) Where are more bacteria found on the body? In moist areas like the axilla and sides of the nose 7) Where are transient organisms usually found? On the skin of our hands and arms 8) What type of bacteria lives on our hands and arms only for a short time because they cannot maintain contact with the salty environment? Transient Microbes 9) What type of bacteria lives on our skin and in hair follicles on sebum produced by our oil glands? Propionibacterium 10) What do Propionibacterium bacteria produce that maintains the acidic pH of our skin? Does this inhibit or suppress the growth of other bacteria? Propionic acid Supresses growth 11) What is the pH of our skin? pH 3-5 12) What media is selective for salt-tolerant organisms? Mannitol salt agar (MSA) 13) What is MSA considered a differential media? Because mannitol-fermenting organisms will produce acid, turning the indicator in the media yellow. 14) Which bacteria is part of the normal microbiota of the skin? Is it considered a pathogen? Staphylococcus aureus Yes, it is a pathogen (opportunistic) 15) When can Staphylococcus aureus cause disease? When the skin is broken. 16) Both pathogenic (including S. aureus ) and non- pathogenic species of Staphylococcus produce what two enzymes? Are they oxidase positive or negative They produce Catalase and collagenase. They are all oxidase negative. 17) What does coagulase do? Clots the blood (clumping) 18) Do all species of Staphylococcus produce coagulase? No, just the ones that are pathogenic ( Staph aureus ) 19) If MSA grows an organism what do we know it is? Staphylococcus 20) What test will prove the organism grown on MSA is Staphylococcus aureus? Coagulase Test will be positive 21) What does the lower respiratory tract include? Is it normally sterile? Larynx, trachea, bronchial tubes, alveoli Yes, it is sterile 22) What does the upper respiratory tract include? Is it normally sterile? Nose and throat No, it is not sterile because it is in contact with the air we breathe 23) What makes bacteria thrive in the throat? Warm, moist environment 24) What bacteria are normally found in the throat? Staphylococcus, Streptococcus, Neisseria, Haemophilus
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Micro Lab Unit 2 Flashcards 25) Why don’t we get sick from these bacteria in our throat?
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