Search results
Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses may be viewed as mobile genetic elements, most probably of cellular origin and characterized by a long co-evolution of virus and host.
2 lut 2023 · Entry: The entire virus or its genetic material enters the host cell cytoplasm and then into the nucleus. Replication: The viral genome is copied, and its genes are expressed to make viral proteins. Assembly: New viruses are formed from the copies of the genome and proteins inside the host.
24 paź 2024 · All true viruses contain nucleic acid —either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)—and protein. The nucleic acid encodes the genetic information unique for each virus. The infective, extracellular (outside the cell) form of a virus is called the virion.
Course: Biology archive > Unit 22. Lesson 1: Viruses. Viruses. Intro to viruses. Bacteriophages. Animal & human viruses. Evolution of viruses. The biology of Zika virus.
A DNA virus is a virus that has a genome made of deoxyribonucleic acid (DNA) that is replicated by a DNA polymerase.
Among RNA viruses and certain DNA viruses, the genome is often divided into separate parts, in which case it is called segmented. For RNA viruses, each segment often codes for only one protein and they are usually found together in one capsid.
Infectious virus particles – also referred to as virions – are constituted of various basic elements (Fig. 2.1): inside, they contain an RNA genome or a DNA genome. Depending on the virus type, the nucleic acid is single-stranded or double-stranded, linear, circular or segmented.
