Molecular biology is a specialized skill that involves the study of biological macromolecules (DNA, RNA, proteins) and their interactions within cells to understand biological processes such as replication, transcription, and translation. It involves the use of various techniques such as PCR, gel electrophoresis, and DNA sequencing to isolate, manipulate, and analyze DNA and RNA molecules. Molecular biology is crucial in understanding the causes of genetic diseases, developing new drugs, and improving crop yields in agriculture.