43. Why is MRSA considered a \"superbug\" A. Can live in many different types of

Question

43. Why is MRSA considered a "superbug" A. Can live in many different types of environments B. Produces antibiotics to outcompete many different species of microbes C. Can live in many different conditions Often acquired in healthcare facilities E. t to a number of different antibiotics 44. The eukaryotic organelles associated with motility and flagella are A. Porins B. Cilia ? D. Histones 45. Prions contain A. RNA B. DNA Protein All of the choices are correct 46. The first forms of life on Earth were thought to be- A. Single-celled plants B. Prokaryotes C. Insects D. Large animals such as dinosaurs 47. Which polysaccharide is found in the cell wall of fungi? A. Starch B. Glycogen C. Chitin D. Cellulose 48. Antibiotic resistance can develop when overusing antibiotics. Why shouldn't a person ill with the flu or a cold use antibiotics? A. Should let nature run its course B. Evolution has made these diseases weak so antibiotics are not necessary C. These strains are antibiotic resistant D. Caused by viruses which aren't affected by antibiotics

Explanation / Answer

43. E.  MRSA or methicillin resistant Staphylococcus aureus is called a super bug because it is resistant to a number of antibiotics including methicillin and penicillin. It is difficult to treat them than any other bacterial infections or other Staphylococcus infections.

44. B. Cilia is the eukaryotic organelle which is associated with motility. It is found in protozoa and some other animal groups. Cilia and flagella have the same structure. Porins and histones can not be the answer because they are not cell organelles but kind of proteins. Pili is not a cell organelle and it does not help in motility but help in adhesion of one bacteria with another and also with human body.

45. C.  Prions are a type of proteins that act as infectious agent.

46. B.  During the course of evolution, the simplest organisms came first, then gradually other organisma with increasing complexity appeared on earth. In the examples given in the question, prokaryotes are the simplest. so, they appeared first, then the single- celled plants, insects and large animals in succession.

47. C. Chitin is a derivative of glucose. It contains N-acetylglucosamine.

48. E. Antibiotics are used to treat bacterial infections. They can not kill viruses as viruses do not have cell and metabolism of their own. Cold and flu are viral diseases. If antibiotics are taken when they are not needed by the body, then body may develop antibiotic resistance and in future antibiotics will not work on the body.

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