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What type of molecule is NOT directly involved in the process of gene expression?

  1. DNA

  2. Messenger RNA

  3. Ribosomal RNA

  4. Lipids

The correct answer is: Lipids

Explanation Gene expression is the process of turning genetic information in the form of DNA into functional proteins. This involves transcription of the DNA into messenger RNA (mRNA) and translation of the mRNA into protein by ribosomes. Lipids are not directly involved in this process; they primarily function as components of the cell membrane and energy storage molecules. While DNA, mRNA, and ribosomal RNA are all involved in the process of gene expression, lipids are not, making them the correct answer.