Vectors Uses for Animal Cell Culture
Polyhedrin protein is

major component of protein matrix in which viruses are embedded
non essential for baculo virus replication
essential for baculo virus replication
both (a) and (b)

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Vectors Uses for Animal Cell Culture
Retroviruses have advantage for being used as vector for animal cells because

All of these
viral gene expression is driven by strong promoters
they cover a wide host range
infection does not lead to cell death, infected cells produce virus over an indefinite period

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