A person consumes diet having only pulses on daily basis. Pulses are deficient in which amino acid:
**Core Concept**
Pulses are a type of legume that are rich in protein, but they have a limitation in their amino acid profile. This is due to the fact that pulses lack a specific essential amino acid that is necessary for human health.
**Why the Correct Answer is Right**
Pulses are deficient in the essential amino acid **methionine**. Methionine is an amino acid that plays a crucial role in various bodily functions, including the synthesis of proteins, DNA, and other molecules. Pulses, on the other hand, have a high content of other essential amino acids like lysine, but they lack methionine. This is why a diet consisting only of pulses is not sufficient to meet the body's protein requirements.
**Why Each Wrong Option is Incorrect**
**Option A:** Lysine - While pulses are high in lysine, they are not deficient in this amino acid. Lysine is actually one of the limiting amino acids in many plant-based protein sources.
**Option B:** Leucine - Leucine is a branched-chain amino acid that is not typically limited in pulses.
**Option C:** Tryptophan - Tryptophan is an essential amino acid that is present in pulses, although in smaller amounts compared to other amino acids.
**Clinical Pearl / High-Yield Fact**
It's essential to note that pulses can be a good source of protein when combined with other plant-based protein sources, such as whole grains, nuts, or seeds, which can complement their amino acid profile.
**Correct Answer: D. Methionine. Methionine.**