Question

“It has not escaped our notice that the specific pairing we have postulated immediately suggest a possible copying mechanism for the genetic material”this is written by
A. Meseison and stahl
B. Archibold Garrod
C. Severo Ochoa
D. Watson and Crick
E. Beadle and Tatum

Answer 1

A cell or organism's genetic material refers to those materials found in the nucleus, mitochondria and cytoplasm that play a key role in determining the structure and function of cellular substances and are capable of self-propagation and variation.Genetics is an area of biology concerned with the study of genes in species, genetic variation and inheritance.

Complete Answer:
- Watson and Crick concluded in their famous historical paper explaining the double helix: it has not escaped our attention that a genetic material copying mechanism is immediately suggested by the specific pairing we have postulated. The authors expanded on this assertion in a subsequent paper by suggesting that each DNA strand that serves as a template for synthesis may be involved in the copying.
- Extensive experimental support has been given to this proposal and is Now accepted as the right version of the system by which the genetic
- DNA knowledge is copied. The process of copying, called semiconservative replication, requires that the two parental strands unwind and separate and that each strand acts as a complementary and antiparallel strand synthesis template. Two identical daughter duplexes are isolated from this four-strand complex.
- Each daughter duplex consists of one parental strand (hence the term semiconservative) and one newly synthesised strand. In both prokaryotes and eukaryotes, semiconservative replication occurs, but specifics of the mechanism differ. Direct experimental evidence for semiconservative replication was provided by an elegant experiment conducted by Matthew Meselson and Franklin Stahl in 1957.

The correct Answer is option (D) Watson and Crick.

Note: The model suggested by Watson and Crick, an aesthetically pleasing spiral staircase able to fall apart like a zipper, had all the hallmarks of a blueprint to create additional copies and this was certainly understood by the two men as more than a mere afterthought. After all, this was an idea large enough to inspire future molecular biologists to make wonderful observations about how our living cells tick, how our characteristics are passed on to our kids, and how diseases can grow when this model goes away.