Which of the following statements are correct?
A) $\alpha$ - amino acids present in protein is L- amino acid.
B) Amino acids contain $\text{NH}_2$ as well as COOH group.
C) Number of amino group and carboxylic group are same in amino acids always.
D) Tryosine was firstly obtained from cheese.
Choose the correct alternatives from below:

Statement A is correct. Naturally occurring $\alpha$-amino acids present in proteins have the L-configuration.

Statement B is correct. Amino acids are organic compounds containing both an amino group ($-\text{NH}_2$) and a carboxylic acid group ($-\text{COOH}$).

Statement C is incorrect. The number of amino and carboxylic groups can vary. Acidic amino acids have more carboxylic groups than amino groups, whereas basic amino acids have more amino groups than carboxylic groups.

Statement D is correct. Tyrosine was first isolated from casein, a protein found in cheese. Its name is derived from the Greek word 'tyros', meaning cheese.

Therefore, statements A, B, and D are correct.

Answer: A, B and D only