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Constitutive promoters are majorly obtained from ________

(a) fungi

(b) bacteria

(c) mammalian cells

(d) viral cells

The question was posed to me in a job interview.

My question is from Cultured Cells in Mammals and Restricted Areas in Intact Organisms topic in portion Using Other Organisms of Genetic Engineering

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Best answer
Correct choice is (d) viral cells

Explanation: Constitutive promoters are majorly obtained from viral cells. They commonly include, SV40 promoters, adenovirus major late promoter etc. In some cases they are also obtained from mammalian cells.

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