The correct statement in respect of the protein haemoglobin is that it

The correct representation of a nucleotide is:

The acid showing salt-like character in aqueous solution is

$A$ dipeptide,$X$ on complete hydrolysis gives $Y$ and $Z$. $Y$ on treatment with aqueous $HNO_2$ produces lactic acid. On the other hand,$Z$ on heating gives the following cyclic molecule.
Based on the information given,the dipeptide $X$ is:

The central dogma of molecular genetics states that the genetic information flows from

Total number of essential amino acids among the given list of amino acids is . . . .
Arginine,Phenylalanine,Aspartic acid,Cysteine,Histidine,Valine,Proline