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.
So it is the energy produced by these algae that forms the basis of the food pyramid in the ocean. (from Duxbury and Duxbury, 1994, An Introduction to the World's Oceans). The pyramid represents energy in the ocean. The widest part is the microscopic algae.Perhaps I should add here that plankton are the very small drifters in the ocean. Phytoplankton are the plants or algae, and zooplankton are the animals.). Note also that at the bottom there are 1000 energy units available. The next level up is the herbivorous (plant eating) zooplankton.