The key term DNA is placed in the first paragraph to introduce the main topic of biotechnology and stress its significance as the foundation for advancements in the field.
The author likely mentioned DNA in the first paragraph of the text to set up the reader to understand the focus of the article, which appears to be the impact of biotechnology on various fields. Mentioning DNA upfront establishes the importance of this molecule as the basis for biotechnological advancements and sets the context for the reader. This is a common technique used in writing to introduce the main topic and highlight its significance right from the beginning. It's crucial because DNA's discovery and manipulation have been central to the progress in biotechnology, and understanding its structure and function is foundational to any discussion on the subject.