Final answer:
Each ribosomal protein, with the exception of the L7/L12 proteins, occurs in one copy per 70S ribosome. A 70S ribosome consists of the 50S and 30S subunits, containing over 70 proteins and essential rRNA components.
Step-by-step explanation:
The question is asking about the number of copies of each ribosomal protein in a 70S ribosome. A 70S ribosome, found in prokaryotes, is composed of two subunits, the 50S and the 30S. These subunits come together to form the functional ribosome that is involved in protein synthesis. Each 70S ribosome is made up of four rRNA molecules and over 70 proteins. Excluding the L7/L12 proteins, which are present in four copies, each of the other ribosomal proteins typically exists in one copy per assembled ribosome. The ribosome is essential for translating mRNA into proteins, playing a crucial role within the cell.