Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing kitten. The measured DNA levels ranged from 6 to 12 picograms per nucleus. In which stage of the cell cycle would the nucleus definitely contain 12 picograms of DNA

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.