Prepare for NEET Biology Biological Classification with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert guidance to classify and identify organisms.
Certain infectious particles lack nucleic acids yet cause diseases. Which of the following correctly describes the infectious agent and a disease it causes?
Viroids; Potato spindle tuber disease
Prions; Creutzfeldt-Jakob disease
Viruses; Tobacco mosaic disease
Lichens; Athlete's foot
A scientist discovers a new infectious agent that causes disease in plants. It is smaller than a virus and composed solely of RNA without a protein coat. What is the most likely classification of this agent?
Virus
Prion
Viroid
Lichen
Which characteristic distinguishes viroids from viruses?
Presence of RNA
Ability to infect plants
Lack of a protein coat
Small size
Which of the following is the smallest infectious agent known?
Virus
Bacteria
Viroid
Prion
Which of the following statements is INCORRECT regarding viroids?
They are smaller than viruses.
They are infectious RNA molecules.
They lack a protein coat.
They contain a protein coat.
Which of the following statements accurately describes viroids?
Small, circular, single-stranded RNA molecules without a protein coat
Small, linear, double-stranded DNA molecules enclosed in a protein coat
Small, circular, single-stranded DNA molecules without a protein coat
Small, linear, double-stranded RNA molecules enclosed in a protein coat
Viroids differ from viruses in that they lack:
A protein coat
Genetic material
Infectivity
The ability to replicate
Which type of nucleic acid constitutes the genetic material of a viroid?
RNA
DNA
Both RNA and DNA
Neither RNA nor DNA
Which statement about the structure of viroids is FALSE?
They are composed of double-stranded RNA.
They lack a protein coat.
They have a circular RNA molecule.
They are smaller than viruses.
