Which statement below is correct regarding protein quality in foods?[Fill in the blank]

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Question: Which statement below is correct regarding protein quality in foods?[Fill in the blank]

Option a: 'Animal sources contain all the essential amino acids except lysine' This is not accurate because animal-derived proteins are generally considered complete, containing all essential amino acids (including lysine). The statement incorrectly singles out lysine as missing, making it false.

Option b: 'Soybeans contain all the essential amino acids for growth' This is the correct assessment in many nutrition texts: soybeans are a high-quality plant protein that provides all the essential amino acids needed for growth, though some sources note that methionine may be relatively low compared to animal proteins. Overall, soy is often classified as a complete protein, so this statement is true.

Option c: 'Most nuts and legumes contain less lysine, therefore have reduced protein quality' This is misleading. Legumes (including many nuts and seeds) tend to be higher in lysine than cereals, making their protein quality relatively good in terms of lysine content. Describing their protein quality as reduced due to lysine scarcity is inaccurate for most nuts and legumes, so this option is false.

Option d: 'The protein quality of some grains is reduced due to less methionine' Grains (cereals) are typically deficient in lysine rather than methionine; methionine content is not the primary limiting amino acid for many common grains. Therefore attributing reduced protein quality to methionine is not correct for most grains, making this option false.

Which statement below is correct regarding protein quality in foods?[Fill in the blank]

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