Amino acids, proteins, and primary structure

Question 1

D and L amino acids
Most prevalent?

Answer 1

Enantiomers due to a.a. chirality
Most are in the L form (also known as the S form)

Question 2

Amino acid dating

Answer 2

Amino acids synthesis in L form but over time racemise due to change in entropy - ratio indicates age.

Question 3

GLutathione

Answer 3

Glycine, cysteine, glutamine - acts as the intracellular reducing agent.