In this article we will discuss about:- 1. Background of Chromosomes 2. Location of Chromosomes 3. Number 4. Shape 5. Size 6. Chemistry 7. Chemical Components 8. Physiology. Historical Background of Chromosomes: i) The term chromosome (Gr. chromo, color; soma, body), when used by Waldeyer in 1888, represented the darkly stained individualized bodies located in the nucleus. ii) Walter S. [...]
Get the answer of: Does Z-DNA Play a Regulatory Role? One of the more interesting discoveries of the last decade was that segments of DNA that have sequences in which purines and pyrimidines alternate along each strand can form left-handed double helices. The Watson-Crick B-form of DNA is a right-handed double helix. The novel left-handed double-helical form of DNA has [...]
In this article we will discuss about the structure of chromatin in the light of nucleosome. Preamble: A supercoil model for chromatin structure was originally described by Pardon and Wilkins in 1972. Later studies of Boldwin (1975), Kornberg (1974) and others have shown that such a sub-unit structure of chromatin is not only present in mammalian cells but also found [...]