The proteins which are insoluble in water are

Assertion : Haemoglobin is an oxygen carrier.
Reason : Oxygen binds as $O_2^-$ to $Fe$ of haemoglobin.

Which of the following statements are correct? A) $\alpha - \text{amino acids present in protein is L- amino acid.}$ B) $\text{Amino acids contain } NH_2 \text{ as well as COOH group.}$ C) $\text{Number of amino group and carboxylic group are same in amino acids always.}$ D) $\text{Tryosine was firstly obtained from cheese.}$ Choose the correct alternatives from below:

The total number of isomeric linear dipeptides which can be synthesised from racemic alanine is

Describe the term $D$ and $L$ configuration used for the amino acids with examples.

The amino acid which is not optically active is