Multiple choice

A bacterium divides every 35 mins. If a culture containing 105 cells/ml is grown for 175 mins, what will be the cell concentration/ml after 175 mins ?

Directions: A child is stung by a honey bee. He immediately experiences respiratory distress and becomes unconscious.

  1. 175x 105 cells

  2. 85x 105 cells

  3. 35x 105 cells

  4. 32x 10<sup id="yui_3_7_2_1_1380257320959_18508">5 cells

  5. 38x 10 cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As we know that bacterium divides after every 35 mins through simple mitotic division therefore number divisions are 175/35=5. Since, one bacterium on division produces 2 cells. The cells concentration after 175 mins will be 105x25=32x105.
 

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