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An ounce of most protein foods delivers about _____ of protein.
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3. Amino Acids
Amino Acid Groups
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Which element in the side chain is most likely responsible for methionine's unique properties?
A
Sulfur (S)
B
Nitrogen (N)
C
Phosphorus (P)
D
Oxygen (O)
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Understand the structure of methionine: Methionine is an amino acid with a side chain containing a sulfur atom. Its chemical formula is C5H11NO2S.
Recognize the role of sulfur in methionine: Sulfur is present in the thioether group (-CH2-S-CH3) of methionine's side chain, which contributes to its unique chemical properties.
Compare sulfur to other elements listed: Sulfur has distinct properties, such as its ability to form thioether bonds, which are not shared by nitrogen, phosphorus, or oxygen in this context.
Consider the biochemical significance: Methionine is often involved in methylation reactions and serves as the starting amino acid in protein synthesis, roles influenced by the sulfur atom in its side chain.
Conclude that sulfur is the element responsible for methionine's unique properties, as it is the defining feature of its side chain and contributes to its biochemical functions.
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