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.
Why does an energy pyramid show a decrease of energy in every trophic level? Much of the energy from the organism consumed is lost as heat. The higher the trophic level, the less energy needed for survival.All of the energy is converted to the mass of the larger organism in the food chain.hy does an energy pyramid show a decrease of energy in every trophic level? Much of the energy from the organism consumed is lost as heat. The higher the trophic level, the less energy needed for survival.