Office Assistant Tasks. 1  Answer phones, direct calls and take messages. 2  Operate office machines; photocopiers and scanners, facsimile machines, voice mail systems and personal computers. 3  Maintain and update filing, inventory, mailing and database systems. 4  Open, sort and route incoming mail, answer correspondence and prepare outgoing mail.
DNA mutations happen when there are changes in the nucleotide sequence that makes up the strand of DNA. This can be caused by random mistakes in DNA replication or even an environmental influence like UV rays or chemicals.
A mutation occurs whenever there is a change in the genetic information of an organism, due to a variety of causes. There are two classes of mutation: point mutations, and frameshift mutations (Some texts and professors classify frameshift as point mutations; others see it as such a different event with drastically different.