NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Exponential growth phase and stationary phase
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lag phase and exponential growth phase
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stationary growth phase and death phase
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stationary growth phase and death phase
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Detailed explanation-1: -Log (Exponential Growth) Phase This is when cells divide by binary fission and the doubling of each generation creates the exponential growth for which the phase is named. Metabolic activity during this stage is high but generally limited to the necessary steps required for reproduction.
Detailed explanation-2: -The log phase is also the stage where bacteria are the most susceptible to the action of disinfectants and common antibiotics that affect protein, DNA, and cell-wall synthesis.
Detailed explanation-3: -Antimicrobial agents are most often tested against bacteria in the log phase of multiplication to produce the maximum bactericidal effect. In an infection, bacteria may multiply less optimally.
Detailed explanation-4: -It has been determined that in a closed system or batch culture (no food added, no wastes removed) bacteria will grow in a predictable pattern, resulting in a growth curve composed of four distinct phases of growth: the lag phase, the exponential or log phase, the stationary phase, and the death or decline phase.