Some viruses store their entire genomes in the form of RNA, and contain no DNA at all. Because they use RNA to store genes, their cellular hosts may synthesize their proteins as soon as they are infected and without the delay in waiting for transcription. On the other hand, RNA retroviruses, such as HIV, require the reverse transcription of their genome from RNA into DNA before their proteins can be synthesized. RNA-mediated epigenetic inheritance has also been observed in plants and very rarely in animals. COUNT 5
QSN1 In what form do some viruses store their entire genome? ANS1 in the form of RNA QSN2 Why do the cellular hosts of some viruses not have to wait for transcription to synthesize their proteins? ANS2 Because they use RNA to store genes QSN3 What is one type of an RNA retrovirus? ANS3 HIV QSN4 What sort of transcription does the genome of HIV require before its proteins can be synthesized? ANS4 reverse transcription QSN5 Besides viruses, where has RNA-mediated epigenetic inheritance been observed? ANS5 in plants and very rarely in animals