The following table is a summary of data taken on the growth of yeast cells in a bioreactor:

Time, t(h) _____________________ Yeast Concentration, X(g/L)

0 .............................................0.010

4 .............................................0.048

8 .............................................0.152

12 ...........................................0.733

16 ...........................................2.457

The data can be fit with the function

X = X0 exp (μt)

where X is the concentration of cells at any time t, X0 is the starting concentration of cells, and μ is the specific growth rate.

(a) Based on the data in the table, what are the units of the specific growth rate?

(b) Give two ways to plot the data so as to obtain a straight line. Each of your responses should be of the form "plot ____ versus ____ on ____ axes."

(c) Plot the data in one of the ways suggested in Part (b) and determine μ from the plot.

(d) How much time is required for the yeast population to double?