Final answer:
The statement regarding the air currents carrying bacteria and the need to minimize movement and talking over a sterile field is true. This is to prevent contamination and maintain sterility in medical environments.
Step-by-step explanation:
The statement regarding air currents carrying bacteria is true. Air currents can indeed transport microbial life, including bacteria, which poses a risk of contamination. That's why in medical settings, particularly when dealing with a sterile field like in surgical rooms or cleanrooms, healthcare workers are taught to minimize body movements and conversations.
This precaution helps maintain the sterility of the environment and prevent infections. The flow of air can pick up bacteria from the skin and other surfaces and deposit them onto a sterile field. Therefore, any unnecessary movement or speaking should be reduced to avoid stirring the air around a sterile setup.
Bacterial ribosomes have a different structure compared to eukaryotic ribosomes. Bacteria, being prokaryotes, contain 70S ribosomes composed of a 50S large subunit and a 30S small subunit, not 80S ribosomes as stated for eukaryotic cells.