Viroids

Q.

What are the similarities and differences between viroids and prions?

Q.

Do Viroids Have DNA?

Q. Which of the following statements is wrong for viroids?

1. They lack a protein coat
2. They are smaller than viruses
3. They cause infections
4. Their RNA is of high molecular weight

Q. Viroids differ from prions in

1. being infectious
2. being microscopic
3. having nucleic acid
4. having cell wall

Q. Potato spindle tuber disease is caused by an organism which has:

1. RNA with protein coat
2. Low molecular weight free RNA
3. Abnormally folded protein

4. Crystalline structure

Q.

What is absent in viroids?

Q. Viroids differ from prions in

1. being infectious
2. being microscopic
3. having nucleic acid
4. having cell wall

Q. Which of the following statements is wrong for viroids?

1. They lack a protein coat
2. They are smaller than viruses
3. They cause infections
4. Their RNA is of high molecular weight

Q. Identify the organism with the following characteristics.
I. Simpler than viruses.
II. Genetic material is ssRNA.
III. Can cause plant diseases.
IV. Requires a host for multiplication.

1. Virions
2. Viroids
3. Prions
4. Mycoplasma

Q. Identify the organism with the following characteristics.
I. Simpler than viruses.
II. Genetic material is ssRNA.
III. Can cause plant diseases.
IV. Requires a host for multiplication.

1. Virions
2. Viroids
3. Prions
4. Mycoplasma

Q.

Viroids lack:

1. Ribosome

2. DNA

3. RNA

4. Protein coat