Gen Micro CH25 SG (Altura)

ICTV classification basis

Viral genome sequence, morphology, host range, and physical properties.

Baltimore classification basis

Nucleic acid type and mechanism of mRNA synthesis.

Bacteriophage

A virus that infects and replicates inside bacteria.

Lytic vs. temperate phage

Lytic phages lyse the host; temperate phages integrate into host DNA.

Directly translated RNA viral genome

Positive-sense single-stranded RNA (+ssRNA).

Reverse-transcribing DNA intermediate

Single-stranded RNA (ssRNA) intermediate.

Enzyme for RNA virus genome replication

RNA-dependent RNA polymerase (RdRp).

Initial step for ssDNA virus replication

Synthesize a complementary strand to form double-stranded DNA.

Virus type creating cDNA from RNA

Retrovirus (reverse-transcribing RNA virus).

How viruses condense small genomes

Using overlapping reading frames and polycistronic mRNAs.