The core promoter region is located most proximally and contains the RNA polymerase binding site, TATA box, and transcription start site (TSS). RNA polymerase will bind to this core promoter region stably and transcription of the template strand can initiate. The TATA box is a DNA sequence (5'-TATAAA-3) within the core promoter region where general transcription factor proteins and histones can bind.
The color palette of diamond is very richly varied; it ranges from pink through red, blue, green, yellow and brown even to black diamonds. The rarest color occurring in natural diamonds is red, followed by green, blue, purple and brown.
Beside yellow and blue, topaz also occurs as orange stones. These orange gemstones come from two varieties of topaz, namely, precious topaz and imperial topaz, which is a pinkish orange and the more valuable of the two.Topaz is the traditional and modern birthstone for November.ext to red and purple diamonds, the orange precious stone is the rarest of diamonds. Like the rest of its kind, this orange rock is the hardest of minerals, and endowed with a high refractive index that makes this orange jewel shine brilliantly. For this reason, diamond is the most expensive of orange gemstones.