To solve this problem, we need to identify the term used for a complex of ribosomes attached to a single strand of RNA. Let's analyze each option:$\newline \bullet$Option 1: Polysome.$\newline$ - A polysome, or polyribosome, is a complex of multiple ribosomes attached to a single mRNA strand, allowing for simultaneous translation of the mRNA into protein.$\newline$ - This is the correct term for the described complex.$\newline \bullet$Option 2: Polymer.$\newline$ - A polymer is a large molecule composed of repeating structural units, typically connected by covalent chemical bonds.$\newline$ - This term does not specifically refer to ribosomes or RNA.$\newline \bullet$Option 3: Polypeptide.$\newline$ - A polypeptide is a single linear chain of amino acids, which is the product of translation by ribosomes.$\newline$ - This term refers to the product of ribosomal activity, not the complex itself.$\newline \bullet$Option 4: Okazaki fragment.$\newline$ - Okazaki fragments are short sequences of DNA nucleotides synthesized discontinuously and later linked together during DNA replication.$\newline$ - This term is unrelated to ribosomes or RNA.$\newline$Therefore, the correct answer is Option 1: Polysome.