|Molecular biology is the study of development, structure and function of macromolecules vital for life. It deals with the molecular basis of biological activity and overlays genetics and biochemistry. It concerns about the various system of a cell and interaction among various biomolecules and covers a broad scope of problems related to molecular and cell biology. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.