Urgent dna is comprised of smaller segments of genes that code for the production of a specific protein. the role of rna polymerase in the initiation step of transcription is to? a)bind and unwind the double helix. b)recognize the promoter sequence of the gene. c)all of the above d)determine where gene synthesis will start.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.