Final answer:
A polyribosome, or polysome, is a string of ribosomes that translate a single mRNA strand simultaneously, leading to increased efficiency in protein synthesis.
Step-by-step explanation:
A polyribosome, also known as a polysome, is a string of ribosomes that translate a single mRNA strand simultaneously. This allows for increased efficiency in protein synthesis. Rather than waiting for each ribosome to complete translation before another ribosome starts, multiple ribosomes can work together to produce multiple copies of the same protein in the same minute. For example, a single ribosome may take approximately one minute to translate an mRNA molecule, but with a polyribosome, multiple ribosomes working together can produce several copies of the protein in the same time frame.