BioMi - 2900 - Viroid Extra Credit

BioMi - 2900 - Viroid Extra Credit - Simon Wong BioMi 2900...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Simon Wong 9/10/08 BioMi – 2900 – Microbiology – Viroid/Prion Extra Credit Viroids in short are infectious RNA molecules. They differ from viruses as viroids do not have a protein coat. The viroid itself is a circular single-stranded RNA which in turn looks like a double-stranded structure due to intra-stand base pairing. The closed circle of RNA has enough secondary structure which makes the viroid stable enough to exist outside the host. The viroid is classified as the smallest known pathogen (it fits Koch’s postulates) where they range from only 246 to 399 nucleotides. Viroids are known to cause plant diseases and thus, they significantly impact the agricultural world. How do they replicate? Much like viruses, viroids cannot replicate by themselves. They need three components in which to replicate RNA polymerase, RNAse, and RNA ligase. The viroids borrow these components from the plant cell. These components are found in either the host cell nucleus or chloroplasts. It has been proposed that viroids replicate through a rolling mechanism. There are two
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

BioMi - 2900 - Viroid Extra Credit - Simon Wong BioMi 2900...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online