# Question: The smallest living thing is probably a type of infectious

The smallest "living" thing is probably a type of infectious agent known as a viroid. Viroids are plant pathogens that consist of a circular loop of single-stranded RNA, containing about 300 bases. (Think of the bases as beads strung on a circular RNA string.) The distance from one base to the next (measured along the circumference of the circular loop) is about 0.35 nm. What is the diameter of a viroid in

(a) m,

(b) μ m,

(c) in.?

(a) m,

(b) μ m,

(c) in.?

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