Storing the information needed to manufacture protein molecules is the function of molecules.

The function of storing the information needed to manufacture protein molecules is performed by DNA (Deoxyribonucleic Acid) molecules. Here's the step-by-step process:

1. DNA Replication: The process begins with the unwinding of the double helix structure of the DNA molecule. This is done by breaking the hydrogen bonds between base pairs. Each single strand of DNA will serve as a template for creating a new strand.

2. Transcription: The next step is transcription, where the DNA sequence of a gene is transcribed into RNA. An enzyme called RNA polymerase binds to the DNA at the start of the gene. It moves along the DNA, making a strand of messenger RNA (mRNA) that is complementary to the DNA.

3. Translation: The mRNA carries the DNA message to the ribosome, which is the site of protein synthesis. Here, transfer RNA (tRNA) molecules carry amino acids to the ribosome. The order of these amino acids determines the type of protein that is produced.

4. Protein Folding: Once the protein has been synthesized, it needs to be folded into the correct shape to be functional. This is done by proteins called chaperones.

5. Post-translational Modifications: After the protein has been folded, it may undergo further modifications, such as the addition of a phosphate group, to become fully functional.

So, in summary, DNA molecules store the information needed to manufacture protein molecules, and this information is used in a multi-step process involving transcription, translation, and protein folding.