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.
(Answer #1). The four spheres show how the four main components of Planet Earth form a complete system. These main components are land, air, water, and life. The lithosphere, also known as Geosphere is made of the earth's core, the mantle, crust, ocean floor,mountains, sand, rocks, alphalt, bricks, etc.The hydrosphere is made of everything water such as oceans, rivers, lakes, rain, snow, and ice caps.hese main components are land, air, water, and life. The lithosphere, also known as Geosphere is made of the earth's core, the mantle, crust, ocean floor,mountains, sand, rocks, alphalt, bricks, etc. The hydrosphere is made of everything water such as oceans, rivers, lakes, rain, snow, and ice caps.