Question

Which of the following statements are correct?
A) \(α\) - 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:

• A. A and B only
• B. A, B and C only
• C. B, C and D only
• D. A, B and D only

Hint:

A, B and D are true; the numbers of amino and carboxyl groups are not always equal.

Answer 1

The Correct Option is D

Step 1: Test A and B
Natural protein amino acids are L, and every amino acid has both functional groups.

Step 2: Test C
Lysine has two amino groups and one carboxyl, so equal numbers are not guaranteed.

Step 3: Test D
The name tyrosine comes from tyros, cheese. So A, B, D hold, option (D).

Final Answer:
Option (D). \[ \boxed{\text{A, B and D only}} \]