Which of the following statements is true regarding the regulation of protein synthesis by amino acid availability?

A Amino acid availability has no effect on protein synthesis
B High levels of amino acids inhibit protein synthesis
C Low levels of amino acids stimulate protein synthesis
D Amino acid availability regulates protein synthesis through the mTOR pathway ✓

Explanation

The mTOR pathway is a key regulator of protein synthesis in response to amino acid availability. When amino acids are plentiful, mTOR is activated, leading to increased protein synthesis.

Source

Proud, Biochemical Journal
Protein Metabolism Cell Biology Regulation of Protein Synthesis Hard MEDICAL Confidence: high