AP BIOLOGY

ANIMAL REPRODUCTION AND DEVELOPMENT

ASEXUAL REPRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The stage of bacterial growth where a population of bacteria undergo a period of rapid growth is
A
The lag phase
B
The exponential or log phase
C
The stationary phase
D
The death phase
Explanation: 

Detailed explanation-1: -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.

Detailed explanation-2: -Log phase, also referred to as the exponential phase or logarithmic phase, is one of the phases observed in a bacterial growth curve. The striking feature of this phase is the property of cell doubling through binary fission. The count of bacteria (new) that appear each time is proportionate to the current population.

Detailed explanation-3: -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-4: -ˈlȯg-, ˈläg-: the period of growth of a population of cells (as of a microorganism) in a culture medium during which numbers increase exponentially and which is represented by a part of the growth curve that is a straight line segment if the logarithm of numbers is plotted against time. called also logarithmic phase.

Detailed explanation-5: -Lag phase: bacteria initially adjust to the new environment, so they appear not able to replicate but the cells might grow in volume; Log (exponential) phase: cells start dividing regularly by the process of binary fission.

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