In this article we will discuss about the classification of lipids. Contrary to carbohydrates which constitute a family of relatively homogenous compounds, lipids form a very heterogenous class of compounds of widely differing structures and grouped according to their insolubility in water and solubility in organic solvents (ether, acetone, chloroform-alcohol mixtures, etc.). These solubility criteria are not absolute. Lipids were [...]
In this article we will discuss about the metabolism of sphingolipids, explained with the help of a suitable diagram. Sphingosine results from the condensation of palmityl-coenzyme A with serine. The next step consists in the binding of a fatty acid which gives a ceramide. This ceramide can react either with CDP-choline to form a sphingomyelin, or with UDP-galactose to give [...]
Amino acids will be incorporated into proteins from the aminoacyl-tRNAs. To study this process we must acquire a wider knowledge of ribosomes and the messenger RNA, which will form a complex with the aminoacyl-tRNAs. Ribosomes: These are ribonucleoprotein particles consisting of about 65% RNAs and 35% proteins in the case of E.coli and which may be obtained from cellular homogenates [...]