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.
In this kind of mutations, DNA molecule divides even before the cell division starts. Types of Mutations:- Point Mutations:- Point mutations occur when a single nucleotide is replaced with another nucleotide base.Insertion and deletion come in this category. Error in the process of replication of DNA molecule results in point mutations.rameshift Mutations:- Mispairing of the DNA molecule causes the frameshift mutations. The changes in the single base pair nucleotide sequence usually insertion or deletion result in these mutations. The whole information coded in the amino acid changes due to frameshift mutations.