Accession number is a unique identification assigned to

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Accession number is a unique identification assigned to a

1. single database entry for DNA/Protein
2. single database entry for DNA only
3. single database entry for Protein only
4. multiple database entry for DNA/Protein

Correct Option: A

An accession number is a unique identifier assigned to a particular genome or protein sequence to uniquely identify it in a database. It is assigned to the entire sequence record (whether DNA or protein) when the record is submitted to GenBank. The NCBI Entrez System is searchable by accession number using the Accession [ACCN] search field.