Multiple Choice
Why are alpha-linolenic acid and linoleic acid considered essential fatty acids?
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3. Amino Acids
Essential Amino Acids
Multiple Choice
Which of the following amino acids can be synthesized by the human body (i.e., is a non-essential amino acid)?
A
Threonine
B
Lysine
C
Alanine
D
Leucine
Verified step by step guidance1
Step 1: Understand the concept of essential and non-essential amino acids. Essential amino acids cannot be synthesized by the human body and must be obtained through the diet, while non-essential amino acids can be synthesized by the body.
Step 2: Review the list of essential amino acids. Essential amino acids include Threonine, Lysine, Leucine, and others. These are required from dietary sources.
Step 3: Identify Alanine as a non-essential amino acid. Alanine is synthesized in the human body, primarily through the transamination of pyruvate, making it non-essential.
Step 4: Compare the amino acids listed in the problem (Threonine, Lysine, Alanine, Leucine) to determine which are essential and which are non-essential. Alanine is the only non-essential amino acid in the list.
Step 5: Conclude that Alanine is the correct answer because it is synthesized by the human body, unlike Threonine, Lysine, and Leucine, which are essential amino acids.
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