Exercise 21.5 Biology Review Questions

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Review Sheet Week 8 Exercise 21.5 Questions 1. Morphology and culturing. Pneumococci are Gram-positive, oval to lancet- shaped cocci that usually occur in pairs or short chains Morphology refers to an organism's structure, form and appearance. Gram stains allow for better viewing of bacterial cell structure 2. Alpha hemolysis 3. Streptococcus pneumoniae are Gram-positive, lancet-shaped cocci (elongated cocci with a ... sensitive to bacitracin than other beta hemolytic streptococci. 4. the swelling of the capsule surrounding a microorganism after reaction with an antibody; the basis of certain tests for identifying microorganisms; "pneumococcus quellung" 5. capsules provide protection from viruses. they can be slippery to defend themselves from being eaten. Protects the bacteria from phagocytosis allowing the bacteria to stay in the body 6. pure culture 7. It is differential based on hemolysis of the agar. Hemolysis can be wide-narrow band beta, alpha, gamma, or none. 8. candle jar in microbiology is used for anaerobiosis in which a lit candle is placed in an air tight jar and if it went out, it would be because it used up all the available oxygen. 9. any streptococcus capable of hemolyzing erythrocytes, classified as α-hemolytic type, producing a zone of greenish discoloration much smaller than the clear zone produced by…show more content…
Vancomycin-Resistant Enterococcus - Enterococci bacteria are normally found in the intestinal tract. They can sometimes become pathogenic and develop resistance to vancomycin. Vancomycin is considered to be the last-resort antibiotic that is administered for infections that are resistant to penicillin and other antibiotics. Vancomycin-resistance decreased because the antibiotic was no longer used and the resistant strains were no longer selected for. With recent outbreaks of MRSA (Methicillin-resistant Staphylococcus aureus) VRE demonstrates that decreasing use of antibiotics can decrease the drug resistance in bacterial

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