Question

DNA as an acidic substance present in nucleus was first identified by---- in 1869; he named it as
A) Meischer,nuclein
B) Watson and crick, DNA
C) Chargaff, nuclein
D) Wilkins, and Franklin, double helix

Answer 1

Hint: There are two types of nucleic acids DNA and RNA.DNA and RNA are genetic material which transfers from parents to their offspring’s. DNA is present in all organisms while RNA is present in some viruses.

Complete answer:
>The acids which are present in the nucleus are the strong acids.
>The nucleic acids are having very complex structure and high molecular weight.
>The nucleic acids formed by the combination of a large number of nucleotides which are joined with each other by linear and unbranched chains.
>These nucleotides are held tightly by phosphodiester bonds.
>Sugar and phosphate components make the backbone of these genetic materials.
>These nucleic acids also contain nitrogenous bases which are two types of Purines and pyrimidines.
>These nucleic acids were first isolated in 1868 by a swiss physician Friedrich Miescher and he called it nuclein.

Additional information:
>DNA has the three structures that are primary, secondary and tertiary structure.
>DNA has a very complex and lengthy structure so it coils to adjust in small spaces.
>DNA has two types linear and circular.
>DNA has the four base Adenine, guanine cytosine and thymine.

So, the correct answer is Meischer,nuclein.

Note: These nucleic acids transfer the information for synthesis of protein.Denaturation is the process in which a DNA molecule is exposed to very high temperature and causes the melting of the DNA and two strands of DNA separated. Renaturation when again two stands associated.