What is a virion quizlet?
A complete, fully developed, infectious viral particle composed of nucleic acid and surrounded by a protein coat outside of the host cell, and is a vehicle of transmission from one host cell to another.
Outer protein coat of a 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.
What is responsible for the shape of a virion?
The amount and arrangement of the proteins and nucleic acid of viruses determine their size and shape. The nucleic acid and proteins of each class of viruses assemble themselves into a structure called a nucleoprotein, or nucleocapsid.
What is the difference between a virus and a virion?
A complete virus particle, outside the host cell, is known as a virion. … After the virion infects a host cell, it no more stays as virion but releases its genome inside the host cell and then replicates itself inside the host cell into many viruses (not virions).
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 do all viruses have in common?
All viruses have genetic material (a genome) made of nucleic acid. You, like all other cell-based life, use DNA as your genetic material. Viruses, on the other hand, may use either RNA or DNA, both of which are types of nucleic acid.
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.
What is a virion composed 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 are three things viruses Cannot do?
Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.