Limiting (deficient) amino acid in Maize is?
**Core Concept**
Maize (corn) is a cereal grain that lacks the essential amino acid lysine, making it a limiting amino acid. Lysine is an essential amino acid that cannot be synthesized by the human body and must be obtained through the diet.
**Why the Correct Answer is Right**
Lysine plays a crucial role in protein synthesis and is involved in the production of collagen, an essential protein for skin, bones, and connective tissue. The lack of lysine in maize can lead to protein deficiency and related health issues. In contrast, other cereal grains like wheat and rice are relatively high in lysine.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** Although tryptophan is an essential amino acid, maize is not particularly low in tryptophan.
**Option C:** Methionine is another essential amino acid, but maize is not the limiting source of methionine.
**Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
The combination of maize and beans provides a complete protein source, as beans are high in lysine, making them a complementary food source.
**Correct Answer:** B. Tryptophan