Final answer:
Each 70S ribosome is composed of a 50S subunit and a 30S subunit. The 50S subunit contains approximately 34 different ribosomal proteins, while the 30S subunit contains approximately 21 different ribosomal proteins. Therefore, a 70S ribosome consists of a total of approximately 55 different ribosomal proteins.
Step-by-step explanation:
Each 70S ribosome is composed of two subunits: a 50S subunit and a 30S subunit. In prokaryotes, such as bacteria, the 50S subunit contains approximately 34 different ribosomal proteins, while the 30S subunit contains approximately 21 different ribosomal proteins. Therefore, a 70S ribosome consists of a total of approximately 55 different ribosomal proteins. It's important to note that the number of copies of each ribosomal protein per 70S ribosome can vary depending on the specific organism and environmental conditions.