A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
1 Objective can be defined as not being influenced by personal feelings or opinions. 2  Subjective can be defined as based on personal opinion.  A statement that is completely unbiased is objective whereas a statement that is characterized by the thoughts and the views of the speaker is subjective.
There is often much confusion between goals and objectives. Whereas as a goal is a description of a destination, an objective is a measure of the progress that is needed to get to the destination. The following table serves to illustrate the difference between goals and objectives.