**Quiz Question: Ribosome Characteristics**Which of the following statements about ribosomes is true?- ○ Eukaryotic ribosomes have a P site, prokaryotic ribosomes do not have a P site- ○ Eukaryotic ribosomes consist of proteins and rRNA, prokaryotic ribosomes do not have RNA- ○ Eukaryotic ribosomes have a large subunit and a small subunit, while prokaryotic ribosomes have just one subunit- ○ Prokaryotic cells don't have ribosomes- ● Eukaryotic ribosomes are larger than prokaryotic ribosomes*Note: The correct answer is highlighted with a filled circle.*

Ribosomes are the cell organelle that helps in the process of translation. The structure of ribosomes contains ribosomal RNA and proteins. Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum, in such case the endoplasmic reticulum is known as the rough endoplasmic reticulum. All ribosome are composed of a small and large subunit. The small subunit binds to an mRNA transcript and both subunits joins together to provide three sites for tRNAs to bind (the A site, P site, and E site), and thus initiates the protein translation from the mRNA transcript. In the diagram, the A, P, and E sites appear in A-P-E order from right to left. Irrespective of their origin all the ribosomes have P - site, proteins, RNA, and two subunits. And prokaryotes have free-cytoplasmic Ribosomes. Prokaryotic ribosomes contains 2 subunits - 50S and 30S which joins together to become 70S Whereas the eukaryotic ribosomes is 60S and 40S which makes 80S ribosomes Where, S stants for Svedbergs, a unit used to measure how fast molecules move in a centrifuge. Bigger the molecule slower the movement. Therefore, we can conclude the only statement that is correct for the ribosomes is the 5th statement. eukaryotic ribosomes are larger than prokaryotic ribosomes.