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PSTV have:
  • a)
    Single-stranded RNA not enclosed by protein coat.
  • b)
    D.S. DNA enclosed by protein coat.
  • c)
    Double-stranded RNA enclosed by protein coat.
  • d)
    S.S. DNA not enclosed by protein coat.
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
PSTV have:a)Single-stranded RNA not enclosed by protein coat.b)D.S. DN...

Structure of PSTV:

PSTV (Potato spindle tuber viroid) is a viroid, which is a small infectious RNA molecule that lacks a protein coat. It is known to have single-stranded RNA that is not enclosed by a protein coat.

Explanation:

Viroids are unique infectious agents that are smaller than viruses and consist of a single-stranded RNA molecule. Unlike viruses, viroids do not have a protein coat (capsid) surrounding their genetic material. This lack of a protein coat is a distinguishing feature of viroids.

PSTV specifically contains a single-stranded RNA molecule that is not enclosed by a protein coat, making it an example of a viroid. This RNA molecule is capable of causing disease in plants, such as potatoes, by interfering with the host's gene expression and metabolic processes.

In summary, PSTV is a viroid with single-stranded RNA that is not enclosed by a protein coat, which sets it apart from viruses that typically have either double-stranded DNA or RNA enclosed by a protein coat.
Free Test
Community Answer
PSTV have:a)Single-stranded RNA not enclosed by protein coat.b)D.S. DN...
  • The Potato Spindle Tuber Viroid ("PSTVd"), the first viroid to be identified, is a small, circular RNA molecule closely related to the Chrysanthemum stunt viroid.
  • Since it is a viroid and does not contain protein coat and contains single-stranded RNA, hence, option A is correct and other options are wrong.
Hence, the correct option is A.
NCERT Reference: Page no. 27 of topic “2.6 VIRUSES, VIROIDS, PRIONS AND LICHENS” of chapter 2.
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PSTV have:a)Single-stranded RNA not enclosed by protein coat.b)D.S. DNA enclosed by protein coat.c)Double-stranded RNA enclosed by protein coat.d)S.S. DNA not enclosed by protein coat.Correct answer is option 'A'. Can you explain this answer?
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