If there are $10^{3}$ cells per $\mathrm{mL}$ at the middle of log phase, and the generation time of the cells is 30 minutes, how many cells will there be 2 hours later? a) $2 \times 10^{3}$ b) $4 \times 10^{3}$ c) $8 \times 10^{3}$ d) $1.6 \times 10^{4}$ e) $1 \times 10^{7}$
Added by Christopher G.
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