In this article we will discuss about the role of phospholipids. Biological membranes are mainly formed by proteins and lipids. In the latter group of constituents, phosphatides and cholesterol are the quantitatively dominant substances. The physical state of phosphatides varies with the temperature. Between the true liquid state and the solid state, these lipids pass through states in which they [...]
Although substantial progress was made during the last decade, all replication mechanisms in eucaryotes are not yet understood because: (a) Replication is an event which occurs much more rarely than in bacteria. Initiation of replication is therefore highly controlled; this complicates the understanding of this process; (b) The DNA is not naked, in the cell, but in the form of [...]
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 [...]