Question

The list given below contains essential amino acids that are basic (X) and also non-essential amino acids that are neutral (Y). X and Y, respectively are
a) Lysine
b) Alanine
c) Serine
d) Arginine
e) Tyrosine

• A. X = b, c, e; Y = a, d
• B. X = a, d; Y = b, c, e
• C. X = a, c; Y = b, d, e
• D. X = a, b, c; Y = d, e

Hint:

Lysine and Arginine: Essential and basic. Alanine, Serine: Non-essential and neutral.

Answer 1

The Correct Option is B

Essential amino acids: Cannot be synthesized by the body and must be obtained from the diet.
Non-essential amino acids: Can be synthesized by the body.
Basic amino acids: Have a net positive charge at physiological pH due to an extra amino group.
Neutral amino acids: Have no net charge at physiological pH.
Lysine (a) and Arginine (d): Essential and basic amino acids.
Alanine (b), Serine (c), and Tyrosine (e): Alanine and Serine are non-essential and neutral. Tyrosine is non-essential and conditionally essential (meaning it can be synthesized by the body only if enough phenylalanine is present). Tyrosine is generally classified as neutral, though it has a slightly polar side chain.