Eukaryotic ribosome are 80S. What does 'S' stand for ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Ribosomes**: Ribosomes are cellular structures responsible for protein synthesis. They are found in both prokaryotic and eukaryotic cells.

2. **Identifying Ribosome Types**: In prokaryotic cells, ribosomes are classified as 70S, while in eukaryotic cells, they are classified as 80S. The 'S' in these classifications indicates a specific measurement related to ribosome size and function.

3. **Defining the 'S'**: The 'S' stands for the Swedberg unit, which is a measure of the sedimentation coefficient. This coefficient indicates how quickly a particle sediments when subjected to centrifugal force.

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