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.
An energy pyramid illustrates the trophic levels of organisms in an ecosystem. Energy pyramids start with the sun, followed by the trophic levels: producers (plants) on the bottom, primary consumers (herbivores) next, then secondary consumers (eat plants and meat) and then tertiary consumers (meat eaters) at the top. To unlock this lesson you must be a Study.com Member.