What is the difference between a virus and a virion?
The illustration at left depicts a virion – the infectious particle that is designed for transmission of the nucleic acid genome among hosts or host cells.
According to Bandea’s hypothesis, the infected cell is the virus, while the virus particles are ‘spores’ or reproductive forms.
Where are virions found?
A virion is the infectious particle that is designed for transmitting the nucleic acid genome among hosts or host cells. Virions are produced in the cytoplasm of complex viral ‘factories,’ the virus.
Is viroid a virus?
Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but, as with viruses, can reproduce only within a host cell. Viroids do not, however, manufacture any proteins. They produce only a single, specific RNA molecule.
Do viruses have DNA?
Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins.
What is virion made of?
The virion, that is the complete infectious virus particle, includes a genome comprising one or a few molecules of either DNA or RNA, surrounded by a morphologically defined protein coat, the capsid; the capsid and the enclosed nucleic acid together constitute the nucleocapsid.
What is the function of a virion?
A complete virus particle is called a virion. The main function of the virion is to deliver its DNA or RNA genome into the host cell so that the genome can be expressed (transcribed and translated) by the host cell. The viral genome, often with associated basic proteins, is packaged inside a symmetric protein capsid.
What are three things viruses Cannot do?
Without a host cell, viruses cannot carry out their life-sustaining functions or reproduce. They cannot synthesize proteins, because they lack ribosomes and must use the ribosomes of their host cells to translate viral messenger RNA into viral proteins.
Do viruses have cells?
A virus is a tiny, infectious particle that can reproduce only by infecting a host cell. … Nor do viruses have cells: they’re very small, much smaller than the cells of living things, and are basically just packages of nucleic acid and protein.
Is a virion alive?
While a virion is biologically inert and may be considered ‘dead’ in the same way that a bacterial spore or a seed is, once delivered to the appropriate environment, I believe that viruses are very much alive. … Viruses are not able to replicate without the metabolic machinery of the cell.