NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The phase of bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing, is the
A
lag phase.
B
log phase.
C
stationary phase.
D
death phase.
Explanation: 

Detailed explanation-1: -Lag time is defined as the initial period in the life of a bacterial population when cells are adjusting to a new environment before starting exponential growth.

Detailed explanation-2: -The log phase continues until nutrients are depleted or toxic products accumulate, at which time the cell growth rate slows, and some cells may begin to die.

Detailed explanation-3: -The lag phase is generally thought to be a period during which the cells adjust to a new environment before the onset of exponential growth. Characterizing the lag phase in microbial growth curves has importance in food sciences, environmental sciences, bioremediation and in understanding basic cellular processes.

Detailed explanation-4: -Lag Phase. The bacteria upon introduction into the nutrient medium take some time to adapt to the new environment. In this phase, the bacteria does not reproduce but prepares itself for reproduction.

Detailed explanation-5: -The log phase (sometimes called the logarithmic phase or the exponential phase) is a period characterized by cell doubling. The number of new bacteria appearing per unit time is proportional to the present population.

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