Which of the following is not a complete protein source?

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Multiple Choice

Which of the following is not a complete protein source?

Explanation:
Proteins are complete when they provide all nine essential amino acids in sufficient amounts. Animal foods like fish, eggs, and milk supply these essential amino acids in a balanced way, so they are complete protein sources. Beans, being plant-based, are incomplete because they are low in one essential amino acid—methionine—so their amino acid pattern isn’t complete on its own. You can achieve a complete profile by pairing beans with grains (such as rice and beans), which supply the missing methionine. So, beans are not a complete protein source by themselves.

Proteins are complete when they provide all nine essential amino acids in sufficient amounts. Animal foods like fish, eggs, and milk supply these essential amino acids in a balanced way, so they are complete protein sources. Beans, being plant-based, are incomplete because they are low in one essential amino acid—methionine—so their amino acid pattern isn’t complete on its own. You can achieve a complete profile by pairing beans with grains (such as rice and beans), which supply the missing methionine. So, beans are not a complete protein source by themselves.

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