Genes genetic information

DNA (deoxyribonucleic acid) (Section 28 7) A polynucleotide of 2 deoxynbose present in the nuclei of cells that serves to store and replicate genetic information Genes are DNA... 

Each such segment of encoded information defines a gene, and expression of the gene leads to synthesis of the specific protein encoded by it, endowing the cell with the functions unique to that particular protein. Proteins are the agents of biological function they are also the expressions of genetic information. 

The hypothesis that our biological world built on the DNA-RNA-protein central dogma was preceded by an RNA world in which RNA molecules carried both the genetic information and executed the gene functions (through ribozyme activity) is now widely accepted [130]. However, it is also well recognized that RNA due to its vulnerability to hydrolysis - especially as a result of catalysis by divalent metal ions - would not have been able to evolve in a harsh pre-biotic environment Also the formation of RNA under presumed pre-biotic conditions is extremely inefficient It is not so far-fetched to propose that a peptide nucleic acid-like molecule may have been able to function as a form of pre-biotic genetic material since it... 

The genetic information within the nucleotide sequence of DNA is transcribed in the nucleus into the specific nucleotide sequence of an RNA molecule. The sequence of nucleotides in the RNA transcript is complementary to the nucleotide sequence of the template strand of its gene in accordance with the base-pairing rules. Several different classes of RNA combine to direct the synthesis of proteins. 

The genetic information in the stmctural region of a gene is transcribed into an RNA molecule such that the sequence of the latter is complementary to that in the DNA. 

Recently, the genetic information has been tremendously expanded and the functions of the proteins are assumed and discussed hy homology comparison of their primary and higher structures. However, it goes without saying that their functions are not fully understood by these methods, until the properties of the proteins are proven hy experiments. It is one of the surest ways to express the gene and prove its functions by actual experiments, if one would really like to use the genetic resources. 

DNA construct will often contain an effect gene and a selectable marker gene (such as antibiotic or herbicide resistance), both of which are bracketed by promoter and terminator sequences. A plasmid vector carries this cassette of genetic information into the plant genome by one of the above methods. 

Crameri, R., and Suter, M. (1993). Display of biologically active proteins on the surface of filamentous phages a cDNA cloning system for selection of functional gene products linked to the genetic information responsible for their production. Gene 137, 69-75. 

In the nuclei of all eukaryotic cells, DNA is tightly wrapped around an octamer of histone proteins and is compacted into a dense structure known as chromatin. In order to access the genetic information which is required in numerous essential cellular processes including DNA replication, gene expression and DNA repair, chromatin needs to be partially unwound. One important mechanism to regulate chromatin structure and thus to control the access of the genomic DNA is through histone modifications [1-6]. The histone octamer is composed of two copies of H2A, H2B, H3 and H4 core histone proteins. Their tails, that protrude out of the surface of the... 

---