Protein Synthesis Occurs on ________, Which are Composed of Proteins

Question

Protein synthesis occurs on ________, which are composed of proteins and ________.
A) ribosomes; mRNA
B) operons; mRNA
C) promoters; rRNA
D) ribosomes; rRNA
E) active sites; DNA

Accepted Answer

Protein synthesis occurs on ribosomes, which are composed of both proteins and rRNA. mRNA is also involved in protein synthesis, but it is not a component of the ribosome itself. Operons and promoters are specific regions of DNA involved in gene expression, but they are not directly involved in protein synthesis. Active sites are regions of enzymes where substrate binding and chemical reactions occur, but they are not related to protein synthesis.