)Viral DNA incorporat A). capsid B). prophage C). envelope. D). phage E). genom
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)Viral DNA incorporat A). capsid B). prophage C). envelope. D). phage E). genom 2) Viral genomes can consist of any of the following except A) double-stranded DNA B) double-stranded RNA C) single-stranded DNA D) single-stranded RNA E) helical capsomeres 3) The host range of a virus is determined by A) the proteins on its surface B) whether its nucleic acid is DNA or RNA C) the proteins on the surface of the host cel. D) the enzymes produced by the virus before it infects the cell E) both A and C 4) Which of the following is characteristic of the lytic cycle? A) Many bacterial cells containing viral DNA are produced B) Viral DNA is incorporated into the host genome. C) The viral genome replicates without destroying the host D) A large number of phages are released at a time E) The virus-host relationship usually lasts for generations 5) The difference between vertical and horizonial transmission of plant vinuses is that A) vertical transmission refers to the transmission of a virus hom pareal plant to its progen transmission refers to one plant spreading the virus to another plant B) vertical transmission refers to the spread of vinuses from upper leaves to lower leaves of th refers to the of a vinus among leaves at the same general level C) vertical transmission refers to the spread of vinuses from trees and tall plants to bushes and D) vertical E) e spread o transmission refers to the tresfer of DNA ftom one type of plant vius to another, refers to the eschange of DNA between two plent vinuses of the same type ansmission refers to the ransfer of DNA Bom a plane ofone species so a plant ofa al ura vertianal uransmission refers to the spread of vinuses among plants of the ecies 6) What are prions A)misfold eculaufRNAu of normal brain p C) viral DNA that has had to ach egment of DNAExplanation / Answer
1) B prophage
A prophage is defined as stable,inherited form of bacteriophage in which the genetic material of the virus is integrated in to and starts replicating, and expressing same rights with the genetic material of the bacterial host.
prophages are major source of new genes and causes new functions.
2) C -single stranded DNA
example-parvo virus
single stand DNA doesnt work on its own it need to get transformed in to circular form and should pair with adjacent another DNA to form double circle.
single sranded DNA have nucleic acids but no use in transfering genitic material.
3) A -proteins on its surface
Host range is defined as spectrum of phage that it can infect and lyse,it is breadth of organisms a viruses is capable of infecting.
viral infection begins when proteins on virus surface binds to particular/specific proteins on surface of host cells.
if virus gained victory by nice captivity of its surface proteins with host surface results in good host range.
4) D
In lytic phage the impatience virus after its entry by using host machinery copies the virus genome,
replication proceeds until the phage is overloaded and suddenly the host cell wall going to lyse and creates a environment to rapid entry of bactreriophage army at once suddenly.
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