T.O Diener (1971) discovered a new infectious agent that was smaller than viruses. It was

Q. Who discovered infectious agents even smaller than virus with only nucleic acid and no protein coat?

Q. 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. Which of the statements are correct with respect to viroids?
I. T. O. Diener discovered a new infectious RNA, smaller than viruses.
II. Molecular weight of RNA is high.
III. Causes potato spindle tuber disease.
IV. Are infectious protein particles.
V. Causes mad cow disease.

Q. How many of the following statements are NOT true?
(i) No virus contains both DNA & RNA
(ii) Viruses couldn’t pass through bacteria – proof filters
(iii) W.M. Stanley showed that viruses could be crystallised
(iv) T.O. Diener discovered viroids

Q. T.O. Diener’s discovery of viroids was important because the new infectious agent had