What is a principal application of DNA sequencing?

• A. It is used to determine the protein structure
• B. It is used exclusively in forensic science
• C. It enables genetic analysis and personalized medicine
• D. It can only be applied in evolutionary biology

Answer: (C)

DNA sequencing plays a crucial role in genetic analysis and personalized medicine, making it the principal application among the given choices. By determining the precise order of nucleotides in a DNA molecule, researchers can identify genetic variations that may contribute to health conditions, disease susceptibility, and drug responses in individuals. This information allows for tailored medical treatments and interventions based on an individual's unique genetic profile, thereby enhancing the efficacy of healthcare and improving patient outcomes.

Other options present narrower or inaccurate scopes of application. While understanding protein structure is essential in biology, it is typically determined through techniques such as X-ray crystallography or NMR rather than directly through DNA sequencing. Suggesting that DNA sequencing is used exclusively in forensic science overlooks its broader applications in medical research, genetics, and conservation biology. Lastly, stating that it can only be applied in evolutionary biology limits the understanding of its vast impact across various fields, including clinical genetics, biotechnology, and more.