[DAT Question of the Day, Click Display Images To See] + Join us on Facebook<http://datquestionoftheday.us4.list-manage2.com/track/click?u=d3318065969b7c08ead5d4c4d&id=6df79bdfcd&e=61d7ba7392> + Connect on Twitter<http://datquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=bd371a4e21&e=61d7ba7392> Effectiveness of Hand Wash Bacteria such as V. cholerae are known to follow an exponential growth curve rate, and will double their number every 15 minutes. Fortunately, anti-bacterial hand wash can kill 99.9% of bacteria on a surface. If a colony of 500 V. cholerae cells are left alone for 2 hours, then anti-bacterial handwash is applied thoroughly, how many bacterial cells are left? A. 4 cells. B. 64 cells. C. 128 cells. D. 256 cells. E. 512 cells. To see the solution and images, visit the following link: http://datquestionoftheday.com/math/effectiveness-of-hand-wash/<http://datquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=7596d2adb8&e=61d7ba7392>