Scientists study biology at the molecular level by analyzing the structure and function of biomolecules such as DNA, RNA, and proteins. Techniques such as X-ray crystallography, NMR spectroscopy, and mass spectrometry are used to determine the structure of these biomolecules. Additionally, techniques such as PCR and gene editing are used to manipulate and study DNA. With these techniques, scientists can uncover the mechanisms of biological processes such as gene expression and protein synthesis.