Biomolecules

Kindly consider the following figure

Glycosidic linkage is present in lactose between C₁ of galactose & C₄ of glucose.

Seliwanoff's test is used to distinguish carbohydrates while xanthoproteic test is used to distinguish proteins

(a) Sucrose -> a-D glucose and b-D fructose

(b) Lactose -> b-D- galactose and b-D glucose

(c) maltose -> a-D glucose and a-D-glucose

Kindly go through the image 

Primary structure of protein in unaffected by physical or chemical changes.

$\alpha -$  Helix (2°) structure of protein is stabilized by intermolecular H-bonding.

Primary structure of protein in unaffected by physical or chemical changes.

A zwitterion is an ion that contains both negative and positive charges. This is a dipolar ion and is considered neutral.

It is a covalent chemical bond that connects amino acids to form polypeptide chains.