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- 7) Which one of the below given properties belongs to ceramic based biomaterials ? a) Easier to shape at any temperature b) May contain organic material portions c) Do not react with the biological enviroment d) Low compressive strength 8) Sort the below given properties for Natural and Synthetic Polymers Can tailor physical, chemical, mechanical and degradative properties Low mechanical properties Non-assurance of pathogen removal Easily mass produced and sterilizedIdentify the single most correct choice: () a) lodine can inactivate microbial cellular proteins. ( b) Alcohols may dissolve lipids and hence possess antimicrobial activities. c) Moist heat may result in protein denaturation and hence possess antimicrobial activities. 7 d) a and c e) b and c f) a, b and c9) Which one of the below given properties can not be among the material selection criteria for biomaterials preparation ? a) Mechanical properteis b) Cheap and available c) Water Absorption rate d) Biostability duration
- Microbes are found mostly in topsoil, but some are found miles deep in bedrock. Nutritionally, how do deeply buried microbes survive?21) a decrease in cell mass, reduction, is observed when which of the following conditions are met. a) abundant energy b) abundant amino acids c)growth factors d) all of these e)none of theseWhich of the following factors does NOT help cells survive and grow well in an AEROBIC environment? a) Superoxide Dismutase b) Catalase c) Peroxidase d) Hydroxyl radicals e) Thioglycolate
- Identify the following polysaccharides for each of the following uses: a.) Plants i.) Cell wall ii.) Storage B.) Animal i.) Exoskeleton ii.) Storage C.) Fungi i.) Cell wall D.) Bacteria i.) Cell wallWhich would move faster in thin layer chromatography?a) Beeswaxb) Phosphatidylinositolc) Cholesterold) SteroidWhich statement among A-D is false regarding physical and chemical agents of control? A) O Effective killing of bacteria via irradiation with UV light would likely take longer than if irradiated with gamma rays or x-rays. B) O Detergent-type disinfectants exert their effect by solubilizing membranes. C) O Antiseptics are generally not as strongly concentrated as disinfectants D) O Sterilization and pasteurization are equivalent processes.
- Which of the following is the most resistant to destruction bychemicals and heat?a) Bacterial endosporesb) Fungal sporesc) Mycobacterium tuberculosisd) E. colie) HIVMicrobes are exposed to a wide variety of environmental factors that affect growth and survival. By giving two (2) examples, discuss how the microbial survival in various environmental conditions has been used to understand its ability to make flavorful and long shelf-life type of foods.Of the two principal polymers used in column chromatography and electrophoresis, which one would be most immune to contamination by bacteria and other organisms?