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.
This continues up the pyramid with each subsequent carnivore only inheriting 10% of the previous level's energy. By the time that the original solar energy hits the top of the pyramid, as little as 0.1% of the energy is consumed by the top predator; the rest is lost to metabolic activities. Decomposers, such as bacteria, worms, and fungi, obtain the little amount of energy remaining in the tissues of dead plants and animals.