Virions are envelope viruses a. true b. false All viruses are obligate intracell
ID: 225758 • Letter: V
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Virions are envelope viruses a. true b. false All viruses are obligate intracellular parasites a. true b. false Viruses cannot be cultured in living cells, only in artificial media a. true b. false Viruses are classified based on: a. presence or absence of envelope b. shape of capsid c. host range d. all of the above viruses are visible through a a. fluorescent microscope b. dark-field microscope c. electron microscope d. light microscope Maturation of viral particles involve the a. recognition process between the virus and host cell, which results in virus attachment to the host cell b. entrance of the virion into the host cell c. infectious viral particles escape from the host cell d. assembly of viral parts into the whole intact detectable virions Viral propagation (multiplication) may be carried out a. in absence of host cells b. on artificial media c. within embryonic duck eggs d. in all of the above Which kingdom in the five kingdoms do bacteriophages belong? a. Monera b. fungi c. protists d. planta. e. none of the above Choose the incorrect statement, Viruses a. may contain either DNA or RNA as their genetic material b. have a protein coat called the capsid c. are obligate intracellular parasite d. may contain a cell wall The following statement is true for All viruses a. the protein coat is surrounded by an envelope b. A virus can, on rare instances, multiply in medium c. the viral genome is either RNA or DNAExplanation / Answer
Answer :--
11 (b)The chemicals needed for replication of virus are manufactured in living cells only.
13 (c) Smaller viruses can not be resolved with even very short wave length of visible or invisible light. So electron microscope which does not use light but cathode rays and can cover the smallest virus is used to see and study viruses.
14 (c) Only assembly of the viral core particle and the protein coat can not make an infectious viral particle.At the final stage after assembly, a no. of biochemical modifications take place which transform the inert particles into infectious agents which ultimately escape from the host body. This stage is known as viral maturation.
15 (c) Virus needs a living medium for multiplication.
16 (e) Bacteriophage i.e.the virus that attacks and infects bacteria do not belong to any of the five kingdoms, because they do not show any sign of life outside the living body and do not contain a cellular structure which is used as a criteria to classify all other organisms belonging to the five kingdoms.
17 (d) Viruses do not contain a cellular structure. They contain only DNA or RNA surrounded by a protein coat
18 (b)
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