1. what are growth factors?
2. suggest an intracellular regulatory molecule (from your text) that growth factors might stimulate to control cell division. describe how it works
3. in the following experiment, you will test the effect of two different growth factors on the growth of your three cell lines. describe an experimental design with appropriate negative controls remember from module 1 interactive lab: a negative control is one that does not have the substance for which you are testing. for example, if you were testing the effect of a fuel additive on your car's gas mileage, a negative control would be a measurement of the gas mileage without using the additive.
4. do you think all cell lines will respond the same way to the growth factors? construct a hypothesis for this experiment.