Biology CLEP Prep Practice Exam

What is the primary function of RNA?

1. Building and repairing proteins

2. Regulating what enters and leaves the cell

3. Collecting electrons from other molecules

4. Transcribing genetic information

The correct answer is: Transcribing genetic information

RNA serves as a messenger molecule that carries instructions from DNA for controlling the synthesis of proteins. Option A may seem correct because building and repairing proteins is a major biological function, but this is actually the primary function of proteins, not RNA. Option B is incorrect because the primary function of RNA is not to regulate what enters and leaves the cell, although RNA does play a role in regulating cellular processes. Option C is incorrect because although some RNA molecules may collect electrons, this is not the primary function of RNA. Therefore, option D is the correct answer as RNA's main function is to transcribe the genetic information from DNA and carry it to the ribosomes for protein synthesis.