Final answer:
The student's question relates to the synthesis and classification of non-essential amino acids in human biochemistry, which the body can produce and are not mandatory to acquire from dietary sources.
Step-by-step explanation:
The question asked is related to the non-essential amino acids and their precursors in human biochemistry. Non-essential amino acids are those that the human body can synthesize on its own and do not need to be obtained directly through the diet. These amino acids include alanine (ala), arginine (arg), asparagine (asn), aspartic acid (asp), cysteine (cys), glutamic acid (glu), glutamine (gln), glycine (gly), proline (pro), serine (ser), and tyrosine (tyr). An important point to note here is that while the human body can synthesize non-essential amino acids, the essential amino acids must be obtained from food as they cannot be produced endogenously.
For instance, the biosynthesis of certain non-essential amino acids such as glutamate, glutamine, and proline is shared in a common pathway, beginning with the enzyme glutamate dehydrogenase which catalyzes the addition of ammonia to α-ketoglutarate in the presence of NADPH to form glutamate. Glutamate then serves as a nitrogen donor for the production of other amino acids. Understanding amino acid metabolism is crucial for comprehending cellular functions and the role of proteins in the human body.
The complete question is The following picture depicts Non-essential amino acids (circled) and their AA precursors......../;