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- 16. Why 70% alcohol is used as a disinfectant? Circle all possible explanation. O A. Alcohol denatures proteins in the plasma membrane or viral body thus destroying it rendering them ineffective and causing cell death or inhibiting reproduction. V B. Water is used as a catalyst for the denaturation of proteins that leads to cell membrane destruction. O c. Alcohol can be taken in orally, destroys cells that entered the body. V D. Diluted alcohol evaporates slower compared to a pure alcohol since its highly volatile, providing more time for chemical reactions to take place. O E. 100% alcohol coagulates proteins instantly creating a film that protects the other proteins from further coagulation preventing other alcohol molecules to react and destroy the cell membrane. O F. Alcohol has a dehydrating effect and may interfere with the functioning of cell membranes.60) An investigator is studying the immune response to an encapsulated strain of staphyloccoccus aureus. Two bacterila culture tubes are treated with human serum. Culture X contains a patient with a genetic deficiency in mannose bisning protein. Culturte Y contains serum form from a healthy individual. After 1 hour. bacterial lysis in culture Yis greater than thqatobtained in culture X. The investigator hypothesizes that the mannose bidning lectin activatesimmune system componentswith serum lysis of the bacteria. Which of the following system complements most likely performs this functions? (A) Complement (B) Eosinophil major basic protein (C) IgM (D) Lysozyme (E) Perforin (F) Toll-like receptorThere have been recurring cases of mad-cow disease in the United Kingdom since the mid-1990s. Mad-cow disease is caused by a prion, an infectious particle that consists only of protein. In 1986, the media began reporting that cows all over England were dying from a mysterious disease. Initially, there was little interest in determining whether humans could be affected. For 10 years, the British government maintained that this unusual disease could not be transmitted to humans. However, in March 1996, the government did an about-face and announced that bovine spongiform encephalopathy (BSE), commonly known as mad-cow disease, can be transmitted to humans, where it is known as variant Creutzfeldt-Jakob disease (VCJD). As in cows, this disease eats away at the nervous system, destroying the brain and essentially turning it into a spongelike structure filled with holes. Victims experience dementia; confusion; loss of speech, sight, and hearing; convulsions; coma; and finally death. Prion diseases are always fatal, and there is no treatment. Precautionary measures taken in Britain to prevent this disease in humans may have begun too late. Many of the victims contracted it over a decade earlier, when the BSE epidemic began, and the incubation period is long (VCJD has an incubation period of 10 to 40 years). A recent study concluded that 1 in 2,000 people in Great Britain carry the abnormally folded protein that causes VCJD. In spite of these numbers, the death rate from VCJD remains low. It is not clear whether this means that the incubation period for the disease is much longer than previously thought, or whether they may never develop the disease. How can a prion replicate itself without genetic material?
- 1.) Which of the following are criteria for antibiotics? ( Select all that apple) A. Kill viruses B. Chemical substances produced by a microscope C. Effective in small doses D. Stops the growth or kills other microorganisms. 2) which antibiotic inhibits protein synthesis? ( select all that apply) A. Gentamicin B. Amoxicillin C. Erythromycin D. TetracyclineAntibiotic Zone of Inhibition A 15 mm B O mm 7 mm 15 mm a. Which antibiotic was most effective against the bacteria being tested? b. Which antibiotic would you recommend for treating a disease caused by this bacterium? c. Was antibiotic A bactericidal or bacteriostatic? How can you tell?What type of antimicrobial/antibiotic is completely synthesized in a laboratory? O Synthetic O Controlled O Natural O Semisynthetic
- Which one of the following statements regarding antibiotics is FALSE? It is a substance produced by microorganisms It is a substance produced totally by chemical synthesis It is a substance produced partially by chemical synthesis JEANETEN SEER E It is a substance produced by our immune system in response to a pathogen OIt kills or inhibits the growth of micro-organismsس 3/ 1 درجة Antibiotics any group of chemical substances produced by various microorganisms and fungi inh the growth or not destroy bacteria and other microorganisms, used in treatment of infectious diseases including penicillin or streptomycin. A. are correct В. are false С. D.Katelyn had been working for Dr. Johnson for a month, and while she had become quite good at measuring inhibitionzones, she didn’t know why she was doing all this work. She had gotten very curious after she began doing all themeasurements on a new set of antibiotics. # is experiment involved infecting mice with MRSA and tracking how theMRSA grew over time.Data were collected by counting the cells of MRSA taken from $ uid samples from the mice. # e cells were measuredby taking one gram of the $ uid and spreading it over plates, but now Katelyn counted the colonies that grew on theplate after 24 hours. Because there were so many, she actually measured the colonies as “log CFU/g.” A CFU is acolony forming unit, or essentially a cell that will divide into a colony that can be seen. Because there can be so many,Katelyn measured them on a logarithmic (log) scale. # e raw data in her lab notebook looked like the following:Table 1. E% ect of treatment on MRSA in mice after 24 hours of drug…
- Doctors prescribe synergistic drug combinations to treatbacterial infections. The purpose of such treatment is to:(a) Change the bacteria with cell walls to L forms lackingcell walls(b) Reduce the treatment time of the disease(c) Prevent microorganisms from acquiring drug resis-tance(d) Reduce the toxic side effects of the antibiotics(e) Use lower doses of antibiotics13. Which media would you use for a skin infection? What about for an intestinal infection? DELL Insert Dele F10 F11 F12 PrtScr F6 F7 F8 F9 F5 Back % & 6. *007. Antibiotic resistance is a constant problem. List three ways that bacteria can be resistant to antiblotics.
