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Question

A host cell has intracellular bacterial symbionts. If growth rate of the bacterial symbiont is 10% higher than the host cell, after ten generations of the host cell, the density of bacteria is host cell will increase :

A
By 10%
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B
Two fold
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C
Ten fold
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D
Hundred fold
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Solution

The correct option is C Hundred fold
Answer is option D i.e. "Hundred fold"
Cell division leads to exponential increase in cell number. This exponential growth is due to fact that one parent cell produces two daughter cells. Each of these daughter cells then serves as parent cell for next generation to produce four daughter cells. As per question, growth rate of the bacterial symbiont is 10% higher than the host cell, thus after 10 generations, it's cell density will be 10^10 = 100 times higher than that of the host cell.

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