Which of the following serves as primer during reverse transcription of the retroviral genomes?

✅Explanation:• The primer for reverse transcription of retroviral genomes is a host tRNA. The tRNA is bound to the viral RNA by the primer binding site (PBS). The reverse transcriptase enzyme then uses the tRNA as a template to synthesize a complementary DNA strand.

Other options explanations:
(A) primer RNA
-A primer RNA is a short piece of RNA that is used to initiate DNA synthesis. However, it is not used by retroviruses.
(C) A nucleotide linked to a protein
-A nucleotide linked to a protein is not used as a primer for reverse transcription.

🔴Related Terminologies::
-Reverse transcription: The process of synthesizing DNA from an RNA template.
-tRNA: A type of RNA that is used to transfer amino acids to the ribosome during protein synthesis.
-Reverse transcriptase: The enzyme that synthesizes DNA from an RNA template.