Which of the following groups of biomolecules is primarily involved in synthesizing molecules needed by the cell?

• A. Lipids
• B. Carbohydrates
• C. Nucleic acids
• D. Proteins

Answer: (D)

Verified step by step guidance

1. Understand the role of each biomolecule group: Lipids are primarily involved in energy storage and forming cell membranes; Carbohydrates are mainly used for energy and structural purposes; Nucleic acids store and transmit genetic information.
2. Recognize that proteins are composed of amino acids and are responsible for a wide range of functions within the cell, including catalyzing biochemical reactions as enzymes.
3. Identify that enzymes, which are proteins, play a crucial role in synthesizing molecules by speeding up chemical reactions necessary for building cellular components.
4. Consider the process of protein synthesis, where ribosomes translate mRNA into polypeptide chains, which then fold into functional proteins that can act as enzymes.
5. Conclude that proteins, due to their role as enzymes, are primarily involved in synthesizing molecules needed by the cell, making them the correct answer.