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Rho protein, that is necessary for transcription termination, is a ________

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Rho protein, that is necessary for transcription termination, is a ________

(a) Homotetramer

(b) Heterotetramer

(c) Heterohexamer

(d) Homohexamer

The question was posed to me in an online quiz.

The question is from Transcription in Prokaryotes : Termination in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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Right option is (d) Homohexamer

For explanation I would say: Rho is a 46KDa hexameric protein with 6 identical subunits. Thus, it is a holohexamer. A four subunit protein with all identical subunit would be a holotetramer, not identical subunit would be heterotetramer respectively.

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