Q. 21 - Biology

Question

Which statement is true of viroids? 

a. They are single-stranded RNA particles. 

b. They reproduce only outside of the cell. 

c. They produce proteins. 

d. They affect both plants and animals. 

Step-by-Step Solution

Answer

Viroids are single-stranded RNA particles.

Step 1: Introduction

Viroids are single-stranded tiny circular RNA (ribonucleic acid) particles without a protein capsid because they are incapable of producing proteins. They can only make one RNA at a time. They also don't come with an outer envelope.

Step 2: Explanation for correct answer

Viroids are single-stranded tiny circular RNA (ribonucleic acid) particles without a protein capsid that can infect plants and cause a variety of plant illnesses.

Step 3: Explanation for incorrect answer

Viruses are intracellular obligatory parasites that do not live outside of their host and only live inside it.

 Viroids, like viruses, can only replicate inside a living host. They are unable to reproduce in the wild. 

Viroids are plant pathogens that can infect a variety of crops, including tomatoes, potatoes, avocados, and coconut trees. They are unable to infect mammals.