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Nissl bodies are mainly composed of:

1. Proteins and lipids
2. DNA and RNA
3. Free ribosomes and RER
4. Nucleic acids and SER

Correct answer: Free ribosomes and RER

Solution

Nissl bodies are aggregates of rough endoplasmic reticulum with free ribosomes, which give them their basophilic staining. They are specialized for protein synthesis in neurons.

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