Which of the following is NOT a characteristic of viroids?
Circular single-stranded RNA
Smaller than viruses
Infectious in plants
Presence of a protein coat
Related Questions
Pick out the wrong statement
Lichens are symbiotic associations
Lichens are very good pollution indicators
Lichens do not grow in unpolluted areas
The algal component of lichen is known as phycobiont
Enzymes are absent in?
Algae
Fungi
BGA
Virus
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.
Virus was discovered by whom?
Stanley
Ivanowski
Herelle
Beijerinck
Tobacco mosaic virus is a tubular filament of size
300 × 20 nm
700 × 30 nm
300 × 10 nm
300 × 5 nm
Which of the following are correct to describe viruses?
I. Simple and unicellular organism.
II. Contain DNA or RNA and enclosed by protein coat.
III. Possess own metabolic system and respond to stimuli.
IV. Maintain genetic continuity and undergo mutations.
The correct combination is
I and II
II and IV
II and III
I and III
Organisms which are indicator of pollution of air
Mosses
Lichens
Mushrooms
Puffballs
Viroids are infectious agents that affect plants. Which of the following statements about their structure is FALSE?
They consist of circular, single-stranded RNA.
They lack a protein coat.
Their RNA codes for proteins.
They are smaller than viruses.
A virus differs from a bacterium as it contains
A cell wall
Cytosol
DNA as genetic material
DNA or RNA as genetic material with no ribosomes
HIV has a protein coat and genetic material
ssRNA
dsRNA
ssDNA
dsDNA
