The correct representation of a nucleotide is:

Secondary structure of a protein refers to

Which of the following tests is a specific test for proteins?

The synthetic sweetener aspartame,known commercially as NutraSweet,is a methyl ester of a dipeptide. In aqueous solution on standing,it changes to:

The correct statements are:
$A$. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
$B$. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
$C$. Nucleotides are joined together by phosphodiester linkage between $C_{3}$ and $C_{5}$ carbons of the pentose sugar.
$D$. Quaternary structure of proteins represents the spatial arrangement of two or more polypeptide chains.
Choose the correct answer from the options given below:

Amino acids contain which of the following functional groups?