Define polysome

Explanation

### Step-by-Step Solution:

1. **Definition of Polysome**: A polysome, also known as a polyribosome, is a complex formed by multiple ribosomes attached to a single strand of messenger RNA (mRNA).

2. **Formation of Polysomes**: When a single mRNA molecule is translated into proteins, several ribosomes can attach to it simultaneously. This results in a chain-like structure where multiple ribosomes are translating the same mRNA.

3. **Ribosome Structure**: Ribosomes are made up of two subunits. In prokaryotes, these subunits combine to form a 70S ribosome, which consists of a 50S and a 30S subunit.

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