Is viroid a virus or bacteria?

viroid, an infectious particle smaller than any of the known viruses, an agent of certain plant diseases. The particle consists only of an extremely small circular RNA (ribonucleic acid) molecule, lacking the protein coat of a virus.

What is the difference between a virus and a viroid?

Viruses and viroids are disease-causing organisms. The difference between virion (virus) and viroid is that viroid is a smaller form of a virus with RNA nucleic acid. In contrast, a virus can have either DNA or RNA.

What is the difference between a bacteria and a virus?

On a biological level, the main difference is that bacteria are free-living cells that can live inside or outside a body, while viruses are a non-living collection of molecules that need a host to survive.

What is the difference between the virus viroid and prions?

Viroids consist of small, naked ssRNAs that cause diseases in plants. Virusoids are ssRNAs that require other helper viruses to establish an infection. Prions are proteinaceous infectious particles that cause transmissible spongiform encephalopathies. Prions are extremely resistant to chemicals, heat, and radiation.

What is an example of a viroid?

Potato spindle tuber viroid
Viroid/Representative species

What do viroids infect?

Viroids are infectious agents that consist only of naked RNA without any protective layer such as a protein coat. Viroids infect plants (but no other forms of life) and are replicated at the expense of the host cell. Viroid genomes are small single-stranded circles of RNA that are only 250–400 bases long.

What is a virus Class 11?

Viruses. The viruses are non-cellular obligate parasites that are characterized by having an inert crystalline structure outside the living cell. Once the viruses infect a cell, they kill the host cell and take over the machinery of the host cell to replicate themselves.

Do viroids have RNA?

Viroids are single-stranded, covalently closed circular RNA molecules. As a distinct class of pathogens, they are clearly distinguished from viruses by their small size (∼250–400 nt), do not encode any protein and lack a capsid.

Which diseases are caused by viroids?

The only human disease known to be caused by a viroid is hepatitis D. This disease was previously ascribed to a defective virus called the delta agent.

How do viroids spread?

Viroids are often transmitted through vegetative propagation of plants, but can also be transmitted during agricultural or horticultural practices in which contaminated instruments are used. Some viroids can be transmitted through seeds and at least one viroid is transmitted by an aphid.