Ribosomes are complex molecular machines responsible for protein synthesis. They are composed of two main components: ribosomal RNA (rRNA) and proteins.

Here's a breakdown of the biomolecules in ribosomes:

* Ribosomal RNA (rRNA): This is the most abundant type of RNA in cells. rRNA molecules fold into complex three-dimensional structures that provide the framework for the ribosome. They also participate in the catalytic activity of ribosomes, aiding in the formation of peptide bonds between amino acids.

* Ribosomal proteins: These proteins bind to rRNA molecules, contributing to the overall structure and function of the ribosome. They also play roles in stabilizing the rRNA structure, facilitating the binding of mRNA and tRNA, and regulating ribosome assembly and disassembly.

The specific types and number of rRNA molecules and proteins vary depending on the organism and the type of ribosome (prokaryotic or eukaryotic).

To summarize, the biomolecules present in ribosomes are:

* Ribosomal RNA (rRNA): A type of RNA that provides the structural framework and catalytic activity.

* Ribosomal proteins: Proteins that contribute to the structure, stability, and functionality of the ribosome.