Final answer:
A logarithmic graph is used to graph the movement of DNA, which moves in an exponential fashion. Logarithmic scales allow a wider range of values to be displayed on the graph. During the logarithmic growth phase, the number of cells increases exponentially.
Step-by-step explanation:
A logarithmic graph is used for graphing the movement of DNA because DNA moves in an exponential fashion.
The log-log plot is commonly used to describe exponential functions.
In the logarithmic growth phase, the number of cells increases exponentially during binary fission.
The log phase is often plotted on a semilogarithmic graph, which gives the appearance of a linear relationship.
Using a logarithmic scale allows a wider range of values to be displayed on the graph.