Viruses, Viroids, and Lichens — Practice Questions
Free NEET Biology multiple-choice questions on Viruses, Viroids, and Lichens. Attempt each question and reveal the answer with a full explanation.
The protein coat of a virus is called the capsid, and it is made up of small subunits called: Capsomeres Nucleotides Peptidoglycans Amino acids D.J. Ivanowsky (1892) recognized certain microbes as the causal agent of the mosaic disease of tobacco. These were found to be smaller than bacteria because: They passed through bacteria-proof filters They could be crystallized They contained only RNA They lacked a cell wall The genetic material of Tobacco Mosaic Virus (TMV) is: Single-stranded RNA Double-stranded RNA Single-stranded DNA Double-stranded DNA Symbiotic association between fungi and algae are called . lichens sponges mycorrhiza chrysophytes Mad cow disease is caused by . prions viroids Aspergillus sp. Mycoplasma sp. There exists a close association between the alga and the fungus within a lichen. The fungus - Provides food for the alga Provides protection, anchorage and absorption for the alga Fixes the atmospheric nitrogen for the alga releases oxygen for the alga T.O.Diener discovered a : Bacteriophage Free infection DNA Free infectious RNA Infectious protein Which of the following shows coiled RNA strand and capsomeres? Polio virus Tobacco masaic virus Measles virus Retrovirus Viruses have :- DNA enclosed in a protein coat Prokaryotic nucleus Single chromosome Both DNA and RNA Which of the following statements is wrong for viroids? They lack a protein coat They are smaller than viruses They cause infections Their RNA is of high molecular weight The protein coat around a virus is called: Capsule Core Capsid Trichome Which of the following statements is incorrect? Prions consist of abnormally folded proteins. Viroids lack a protein coat. Viruses are obligate parasites. Infective constituent in viruses is the protein coat. Which of the following is correct about viroids? (1) They have free RNA without protein coat (2) They have DNA with protein coat (3) They have free DNA without protein coat (4) They have RNA with protein coat