The mid-domain effect is the increasing overlap of species ranges towards the center of a shared, bounded domain due to geometric boundary constraints in relation to the distribution of species' range sizes, producing a peak or plateau of species richness towards the center of the domain.
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[B] is the correct option
→ The transcriptional regulatory proteins in eukaryotes which induce transcription usually have at least two distinct domains of protein.
Option A is correct.
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B) At least two distinct domains of protein structure and a DNA binding domain.
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