Question

A bacterium divides after every 35 min. If a culture containing 105cells per mL is grown, then cell concentration per mL after 175 min will be -


(a) 175 x 105

(b) 125 x 105

(c) 48 x 105

(d) 32 x 105

Answer 1

Each time the cells divide you get 2 cells where you had 1.

175 minutes / 35 minutes/division = 5 divisions

You have 2 * 2 * 2 * 2 *2 or 2^5 or 32 times as many cells as you started out with.

1 * 10^5 * 32. You simplify.

Answer 2

the answer is 32*10^5 cells