Consider the following list of amino acids: Valine, Glycine, Aspartic acid, Tryptophan, Leucine, Proline, Methionine How many of the above amino acids are essential?

Step-by-step solution

Essential amino acids are those that cannot be synthesized by the human body and must be supplied in the diet. Let us evaluate the given list based on the NCERT classification: Valine - Essential Glycine - Non-essential Aspartic acid - Non-essential Tryptophan - Essential Leucine - Essential Proline - Non-essential Methionine - Essential There are exactly 4 essential amino acids in the given list (Valine, Tryptophan, Leucine, and Methionine). Answer: 4