Viroids differ from viruses in that they lack:
A protein coat
Genetic material
Infectivity
The ability to replicate
Related Questions
A teacher was explaining about a constant physical contact involving almost equal physiological interdependence in two different thalloid forms. He was trying to explain
Mycorrhizal association
Establishment of heterothallism
Operation of heterothallism
Advent of lichen formation
The symbiotic relationship between fungi and algae is called
Lichen
Mycorrhiza
Helotism
Mutualism
Which characteristic allows lichens to thrive as pioneer species on bare rock?
Secretion of rock-dissolving acids
Deep root systems
Tolerance to shade
Dependence on organic matter
Contagium vivum fluidum concept of virus was proposed by
DJ lvanowsky
MW Beijerinck
Stanley
Robert Hooke
Identify the correct pair that shows the double stranded RNA among the following
(a) 5'-GAUCCG-3' and 3'-CUAGGC-5'
(b) 5'-GAUCCG-3' and 5'-CUAGGC-3'
(c) 5'-GAUCCG-3' and 3'-GAUCCG-5'
(d) 5'-GAUCCG-3' and 5'-GAUCCG-3'
HIV has a protein coat and genetic material
ssRNA
dsRNA
ssDNA
dsDNA
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.
Which of the following organisms are typically the first to colonize bare rocks in primary succession?
Lichens
Mosses
Grasses
Shrubs
Bacteriophage are
Bacteria that attacks viruses
Viruses that attacks bacteria
Free living viruses
Free living bacteria
I. DJ Ivanowsky (1892) recognised certain microbes as causal organisms of the mosaic disease of tobacco
II. MW Beijerinck (1898) demonstrated that the extract of infected plants of tobacco could cause infection in healthy plants and called the fluid as contagium vivum fluidum
III. WM Stanley (1935) showed that these microbes could be crystallised and crystals consist largely of protein
The above statements are assigned to
Bacteria
Virus
Prions
Lichens
