What it the general mode of action of vancomycin? inhibition of call wall synthe
ID: 65991 • Letter: W
Question
What it the general mode of action of vancomycin? inhibition of call wall synthesis inhibition of growth by analogues of essential metabolites inhibition of membrane function inhibition of protein synthesis inhibition of nucleic acid synthesis Comparing aerobic respiration (AR) with photosynthesis (p) as earned out by an E. coti or cyanobacterium, which of the following is not true. P makes oxygen. AR consumes oxygen AR makes water. P splits water AR reduces carbon. P oxidizes carbon P uses NADP. AR uses NAD All of the above are true The best way to maintain bacteria (without changes) for long periods is: by multiple transfers on the proper medium. in the freezer (-20 C) on top of a refrigerator. in broth at 37degree C. in the refrigerator.Explanation / Answer
48.
Vancomycin is a glycopeptide that inhibits the second stage of cell wall synthesis in bacteria. Penicillin is betalactam antibiotic also inhibits the cell wall synthesis. Sulfonamides are growth analogue metabolite inhibitors. Polymyxin is the cell membrane function inhibitor, Chloramphenicol and Rifampin are protein synthesis and RNA inhibitors and quinolones are nucleic acid synthesis inhibitors. Hence, option A is correct.
49.
Photosynthesis consumes CO2 and O2 is produced and it is reverse incase of respiration. In respiration O2 is consumed and CO2 is released. Aerobic respiration produces water and CO2 by conversion of glucose molecule. Photosynthesis splits water molecule to release O2 . In aerobic oxygen is reduced but not C, in photosynthesis C is reduced. In photosynthesis NADP is used while in aerobic respiration NAD is used. Hence, option C is correct.
50.
Pure cultures are maintained by transferring on to a suitable medium and but frequent transferring may cause genetic modification in bacteria. Several bacteria may not be survived at refrigeration temperatures or at -200 C. Lyophilization or freeze drying is inactivation of bacterial enzymes and maintaining cultures at low temperatures. The bacteria can be revives by transferring to suitable medium whenever required. At 370 C or room temperature in broth the cultures can be stored for short periods. All bacteria cannot be stored refrigerator for long time. In lyophilization only the bacteria can be stored up to 20 years. Hence, option C is correct.
51.
Alcohols and heat coagulate proteins: true
Oxidizing agents and metals oxidize and remove free sulfhydryl groups: true
It takes just as long to kill the last organism in a population of one million as it did to kill the first 900,000: False
The presence of excess organic matter reduces the effectiveness of killing: true
As the time of exposure increased the number of bacteria survives decrease and number of bacteria dead is increased. Hence, option C is correct.
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