Biology

The correct answer is: A.Nucleus

Explanation:

In eukaryotic cells, protein synthesis begins in the nucleus. The process starts with the transcription of a gene into messenger RNA (mRNA), which is a copy of the gene's DNA sequence. Once the mRNA is synthesized in the nucleus, it exits through the nuclear pores into the cytoplasm, where it will be translated into a protein.

However, while protein synthesis begins with transcription in the nucleus, the translation (the actual assembly of the protein from amino acids) occurs on the ribosomes in the cytoplasm or on the rough endoplasmic reticulum (ER) if the protein is destined for secretion or insertion into the cell membrane.

Why the other options are incorrect:

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