The correct answer is: C) proteins
Ribosomes are organelles involved in protein synthesis during translation which are composed of two subunits, the big and the small one , ribosomal RNA (rRNA) molecules and ribosomal proteins. Ribosome has binding sites for RNA binding: mRNA which contains codons for protein synthesis and tRNA which contains anticodons complementary to codons.
Answer:
They bind to an allosteric site which induces a conformational change that increases the affinity of the enzyme's active site for its substrate. This increases the reaction rate.