(Solved): 66. An example of an agent that lowers the surface tension of cells is A. Phenol B. Chlorine C. Alc ...

66. An example of an agent that lowers the surface tension of cells is A. Phenol B. Chlorine C. Alcohol D. Formalin 67. The primary action of heat is to A. Dry, destroy cell wall B. Moist, kill vegetative cells C. Dry, dissolve lipids D. Moist, denature proteins. 68. Microbe(s) that is /are the target(s) of pasteurization include (s) : $$\begin{array}{ll}\text{ A. Clostridium botulinum }& \text{ B. Mycobacterium species C. }\end{array}$$ Salmonella species D. Brucella species E. B, C, and D. 69. The most versatile method of sterilizing heat-sensitive liquids is A. UV radiation B. Exposure to ozone C. Beta propiolactone D. Filtration 70. Which of the following is an approved sterilant? A. Chlorhexidine B. Betadyne C. Ethylene oxide (ETO) D. Ethyl alcohol 77. Silver nitrate was used : A. As antisepsis of burns B. As a mouthwash C. To treat gonorrhea of the eye in neonates $$\mathrm{D}$$. To disinfect water. 78. A microbicidal agent has what effect? A. Sterilizes B. Inhibits microbial growth C. Is toxic to human cells D. Destroys Microorganisms 79. Any process that destroys the non-spore-forming contaminants on inanimate objects is A. Antisepsis B. Disinfection C. Sterilisation D. Degermation 80. The dose required to kill $$50\%$$ of experimental animals under standard condition is A. ID $${}_{50}$$ B. $${\mathrm{MLD}}_{50}$$ C. $${\mathrm{TCIC}}_{50}$$ D. $${\mathrm{LD}}_{50}$$ 81. Viruses are: A. Obligate intracellular parasites B. Have their own metabolism C. Divide by binary fission D. Have both DNA and RNA 82. Mannitol salt agar is an example of : A. Selective medium B. Differential medium C. Both A and B D. Enrichment medium 83. Motility of bacteria can be observed by: A. Hanging drop method B. Soft agar method C. Both A and B D. Pour plate method