# Biology calculation Help plz URGENT

1. if the dry weight of a single bacterial cell is 1 x 10^-12 g, calculate the TOTAL dry weight in 100ml of a bacterial culture with a starting cell concentration of 1 x 10^6 cells/ml, a growing period of 3 hours and a mean generation time of 20 minutes.

any help will greatly appericated . thanks
2. (Original post by sd2011)
if the dry weight of a single bacterial cell is 1 x 10^-12 g, calculate the TOTAL dry weight in 100ml of a bacterial culture with a starting cell concentration of 1 x 10^6 cells/ml, a growing period of 3 hours and a mean generation time of 20 minutes.

any help will greatly appericated . thanks
Sorry this is a bit of a late reply, but better late than never. If you multiply the dry weight of a single bacterium by the initial number of bacteria, you get the initial mass. Then you'd have to double this 9 times (3 x 20 mins per hour, for 3 hours).

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