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Which is the primary sigma factor in Bacillus subtilis?(a) σ^70(b) σ^43(c) σ^35(d) σ^32This question was addressed to me during an online exam.Question is from Transcription in Prokaryotes : Sigma Factor in division Gene Expression : Transcription Prokaryotes of Cytogenetics

Answer»

Right option is (b) σ^43

Best explanation: σ^43 is the normally active sigma factor for Bacillus subtilis while σ^70 is the normally active sigma factor for E. COLI. σ^32 is expressed under STRESSED CONDITIONS like heat shock when it competes with σ^70 for RNA pol core.



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