A complex of ribosomes attached to a single strand of RNA is known as

Options

A. Polymer
B. Polypeptide
C. Okazaki fragment
D. Polysome

Answer

To answer the question, "A complex of ribosomes attached to a single strand of RNA is known as," we need to analyze the options provided and understand the concept of ribosomes and their association with RNA.

### Step-by-Step Solution:

1. **Understanding Ribosomes**:
- Ribosomes are cellular structures that are responsible for protein synthesis. They are made up of ribosomal RNA (rRNA) and proteins. Ribosomes do not have a membrane and can exist as free ribosomes or be attached to the endoplasmic reticulum (ER).

**Hint**: Remember that ribosomes are essential for translating mRNA into proteins.

2. **Ribosome Structure**:
- Ribosomes consist of two subunits: a small subunit and a large subunit. These subunits come together during protein synthesis.

**Hint**: Think about the structure of ribosomes and how they function in protein synthesis.

3. **Ribosomes and RNA**:
- When ribosomes attach to a single strand of messenger RNA (mRNA), they form a complex that allows for the simultaneous translation of the mRNA into a polypeptide chain.

**Hint**: Consider how ribosomes interact with mRNA during the process of translation.

4. **Identifying the Complex**:
- When multiple ribosomes are attached to a single mRNA strand, they form a structure known as a "polysome" or "polyribosome." This allows for multiple copies of a protein to be synthesized simultaneously from the same mRNA template.

**Hint**: Recall the term used for a cluster of ribosomes working together on a single mRNA strand.

5. **Evaluating the Options**:
- Option A: Polymer - Incorrect, as polymers are large molecules made of repeating units.
- Option B: Polypeptide - Incorrect, as polypeptides are chains of amino acids, not ribosome complexes.
- Option C: Eukaryotic fragment - Incorrect, as this does not refer to ribosome complexes.
- Option D: Polysome - Correct, as this term specifically refers to a complex of ribosomes attached to a single strand of RNA.

**Hint**: Eliminate the options that do not relate to ribosome complexes.

### Final Answer:
The correct answer is **D) Polysome**.