Viroids a) contain only single stranded RNA and cause disease in plants b) use r
ID: 168125 • Letter: V
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Viroids a) contain only single stranded RNA and cause disease in plants b) use reverse transcriptase in their replication c) are similar in structures to phages d) can cause human diseases Animal viruses can be classified according to a) lipid composition b) Ribosome count c) Genome type, shape and presence of an envelope d) None of the above True or False Prions are infectious agents that consist of only RNA True or False An acute infection tends to be localized, short in duration and often checked by the host's immune system. True or False A naked phage can enter by both endocytosis and entry following membrane fusion method. These proteins on enveloped viruses aid in the process of entry a) spike proteins b) collagen c) tubulin d) capsomeres Filamentous phages a) always kill the host cell b) are long thin fiber- like phages that can multiply inside the host without killing the host allowing the host to also multiply. c) contain only RNA d) none of the above An example of a single stranded DNA lytic phage is a) M13 phage b) Phi X 174 phage c) T4 phage d) Lambda phage True or False B cells produce antibodiesExplanation / Answer
32. A.) Viroid are smallest plant pathogens with circular single stranded RNA molecule without any protein coat
33. Viruses are classified on the basis of genome (nucleic acid types), morphology,mode of replication, types of host and diseases they caused. Thus, Answer will be d.) none of the above
34. False. because Prions are infectious agent composed of protein only
35. True Actue infection is localzed cellualr damage caused by pathogen and it is for few days only
36. True . According to dfferent theroies naked phage can enter through endocytosis and membrane fusion both
37.True spike protein help virus to enter into cell
38. B.) Filamentous phage like M13 are secreated in enviornment without killing the host.
39. B, Phi X 174 phage is the example of ssDNA lytic phage
40. True. B cells produce antibodies (not T cell)
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