virusoid

Thân thiện

A scientist examines a virusoid under an electron microscope.

Definition

1. Noun:
   • The smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat: A virusoid is a type of subviral agent, specifically a small, circular RNA molecule that depends on a helper virus for its replication and encapsidation. It is considered among the smallest known infectious agents.

Usage

• Noun:
  • Virusoids are studied to understand the minimal genetic requirements for replication.
  • The scientist identified a novel virusoid in the infected plant sample.
  • Unlike typical viruses, a virusoid lacks its own protein coat.

Examples

• Noun:
  • The research paper detailed the structure of the virusoid.
  • Infection by the helper virus is necessary for the virusoid to multiply.
  • Virusoids are associated with certain plant diseases.

Advanced Usage

• In virology: The term "virusoid" is used to classify a specific category of subviral satellite RNAs. Their replication is entirely dependent on the enzymes provided by their helper virus.
  • The study of virusoids provides insights into the evolution of RNA genomes.

Variants and Related Words

• Viroid (noun): An infectious agent similar to a virusoid, consisting solely of a short strand of circular RNA without a protein coat, but capable of autonomous replication in plant cells. Virusoids are a type of satellite viroid.
• Satellite RNA (noun): A broader category that includes virusoids; small RNA molecules that require a helper virus for replication and encapsidation.

Synonyms

• Subviral agent: A general term for infectious particles that are simpler than viruses, including viroids and virusoids.
• Satellite nucleic acid: Refers to small, dependent RNA or DNA molecules, which encompasses virusoids.

Notes on Meaning

• The term "virusoid" is highly specific to molecular biology and plant pathology. It should not be confused with "viroid," which is a related but distinct agent capable of independent replication. The defining characteristic of a virusoid is its obligatory dependence on a helper virus.

Học thuật

Noun

1. the smallest of viruses; a plant virus with its RNA arranged in a circular chromosome without a protein coat

Từ đồng nghĩa

• viroid