1. Tardigrade
  2. Question
  3. Biology
  4. Read the given statements that describe certain infectious particle. (i) It was discovered by T.O. Diener and was found to be smaller than viruses. (ii) It causes potato spindle tuber disease. (iii) It is a free RNA particle which lacks the protein coat. (iv) It has low molecular weight RNA as genetic material. Which of the following is referred to here?

Q. Read the given statements that describe certain infectious particle.
(i) It was discovered by . Diener and was found to be smaller than viruses.
(ii) It causes potato spindle tuber disease.
(iii) It is a free particle which lacks the protein coat.
(iv) It has low molecular weight as genetic material.
Which of the following is referred to here?

 1580  186 Biological Classification Report Error

Solution:

Viroids are small, circular RNA molecules without a protein coat, and they consist only of nucleic acid( RNA). They require other helper viruses to establish an infection. The smallest viroid identified is small cytoplasmic RNA. It causes potato spindle tuber disease and they are smaller than viruses.