Ribosomes are mostly imbedded in the membranes of the and are the sites of synthesis.

Endoplasmic reticulum and protein.

Explanation:

Ribosomes are present in case of both prokaryotes and eukaryotes. The ribosomes are made of large and small subunit. The prokaryotes has 70S ribosomes and eukaryotes has 80S ribosomes.

The ribosomes are found to be embedded mostly in the endoplasmic reticulum membrane. They are considered as the most important site for the protein synthesis and contains all the machinery for the protein synthesis in prokaryotes and eukaryotes.

Thus, the  correct answer is endoplasmic reticulum and protein.

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