In this article we will discuss about the structure of RNA. RNA is a long un-branched polynucleotide chain chemically similar to DNA except for two major differences. The sugar in DNA is a deoxyribose, in RNA a ribose. Out of the 4 nucleotides, three (G, C and A) are identical in DNA and RNA. The fourth is thymine in DNA, [...]
In this article we will discuss about the biochemical evidence that genes are made of DNA. Quantitative estimations of DNA carried out on various organisms revealed the following constant features, providing additional support for DNA as the genetic material: 1. The amount of DNA per cell in an organism or a given species is remarkably constant and cannot be altered [...]
The below mentioned article provides notes on colchicine. In 1937 O.G. Eigsti first succeeded in inducing tetraploidy in cells of onion root tips by the chemical colchicine. This is an alkaloid obtained from the seed and corm of liliaceous plant Colchicum autumnale. In high concentrations the drug is highly toxic to cells. If used in concentrations as low as 0.01% [...]