In this article we will discuss about the nitrogen cycle. Ultimate source of nitrogen to all the living organisms is molecular or atmospheric nitrogen which constitutes about 78% of the air. This nitrogen after being fixed into inorganic nitrogenous compounds is consumed by the plants where it is converted into proteins etc., i.e., organic nitrogen and is then eaten by [...]
Let us make an in-depth study of the sulfur assimilation in higher plants. Conversion of inorganic sulphur compounds such as SO42- into sulfur-containing organic compounds such as cysteine by plants is called as sulfur or sulfate assimilation. The first step in sulfate assimilation in plants is conversion of sulfate into cysteine. Sulfur in sulfate is present in highly oxidised state [...]
Let us make an in-depth study of the nucleotides metabolism with special emphasis on de novo synthesis of nucleotides. Nucleotide consists of a purine or pyrimidine base plus a pentose sugar (ribose or deoxyribose) and a phosphoryl group (H3PO4). The purine ring consists of a 5-membered imidazol ring fused to a six-membered ring structure with two common or bridge carbon [...]