What is the significance of DNA sequencing?

• A. Determines the exact order of nucleotides in a DNA molecule
• B. Helps in synthesizing proteins
• C. Increases the rate of DNA replication
• D. Provides a method for cloning DNA

Answer: (A)

The significance of DNA sequencing lies primarily in its ability to determine the exact order of nucleotides in a DNA molecule. This process reveals the specific sequence of the bases (adenine, thymine, cytosine, and guanine) that make up the DNA strand. Understanding this sequence is crucial for various applications in genetics, biology, and medicine.

By knowing the precise arrangement of nucleotides, researchers can identify genes, understand genetic variations, and investigate the functions of different segments of DNA. This genetic information is fundamental for tasks such as diagnosing genetic disorders, studying evolutionary relationships, and developing targeted therapies in personalized medicine.

The other aspects, while important in their respective contexts, do not capture the primary significance of DNA sequencing itself. For instance, protein synthesis involves transcription and translation processes that occur after the sequence is known, and neither DNA replication acceleration nor cloning specifically reflects the core utility of sequencing. Ultimately, the determination of nucleotide order is the foundational step that enables these further applications in biotechnology and genetic engineering.