TFIIE -80 to +30 For bacterial RNA polymerase, only the sigma factor is needed for the enzyme to recognize the promoter. The eukaryotic transcription factors may indeed act as sigma factors to allow the eukaryoitic RNA polymerase to recognize the promoter.
An energy pyramid is the graphical representation of the trophic levels (nutritional) by which the incoming solar energy is transferred into an ecosystem.The source of energy for living beings on Earth is the Sun.The energy that the Sun emits at present is of 1366.75 W/m^2 (400 years ago, it was of 1363.48 W/m^2).n energy pyramid is the graphical representation of the trophic levels (nutritional) by which the incoming solar energy is transferred into an ecosystem.
It comprises mostly of hydrogen and helium. Hydrogen, accounts for approximately 74 percent of the total mass of the sun, while helium accounts for 24 percent of the total mass. The other elements that the sun is comprised of are oxygen, iron, silicon, nickel, sulfur, magnesium, neon, carbon, chromium and calcium. Oxygen is 1 percent of the total mass of the sun, while the other elements constitute 1 percent of the total composition of the sun.