Answer: Several ribosomes translating one mRNA.
- A Several ribosomes translating one mRNA
- B A single ribosome carrying extra rRNA
- C A broken ribosome that cannot function
- D A ribosome permanently bound to the nucleus
Correct answer: A. Several ribosomes translating one mRNA
Explanation: A polysome is a group of several ribosomes simultaneously translating the same mRNA molecule, greatly speeding up protein synthesis.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.