Which of the following amino acids is essential? (2023)

Which of the following amino acids is essential? (2023)

Step 1: Understand what amino acids are. They are the building blocks of proteins.
Step 2: Learn the difference between essential and non-essential amino acids. Essential amino acids cannot be made by the body and must be obtained from food.
Step 3: Identify the amino acids that are considered essential. These include leucine, isoleucine, valine, lysine, methionine, phenylalanine, threonine, and tryptophan.
Step 4: Focus on the question, which asks for an essential amino acid. Leucine is one of the essential amino acids.
Step 5: Conclude that leucine must be obtained through diet, as it is essential.

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