Question

Which of the 2 amino acids are semi essential for growth?
A. Arginine and histidine
B. Cysteine and valine
C. Leucine and isoleucine
D. Arginine and methionine

Answer 1

Hint: Amino acids are organic compounds that contain amine and carboxyl functional groups. They make up 70-75% of the human body and are crucial for almost all the body functions.

Complete answer:
Amino acids are proteinogenic (protein producing) elements that are very important for the human body. They make up 70-75% of the human body. Amino acids are of different types
a) Essential- cannot be made by our body and must be ingested with the food. They are also called indispensable amino acids. Vegetarians and vegans have a hard time acquiring these. Some examples of essential amino acids are valine, tryptophan, methionine, etc.
b) Semi-essential- they are conditionally essential by humans. Their synthesis in the body is limited but it is not synthesized in sufficient quantities in infants, children and the ill. The semi essential amino acids in humans are arginine and histidine.
Arginine: It is involved in the nitrogen monoxide cycles in humans. It also influences:
> Blood pressure
> Erection in males
> Muscle building
> Muscle regeneration
Histidine: It plays an important role in action of different enzymes. It is essential in infants and people with kidney disorders called uremia. It helps in repairing tissues and cells. It helps to protect nerve cells. Histidine also produces histamine in the body as a response to allergic reactions.

Thus, the correct answer to this question is option ‘A’- Arginine and Histidine.

Note: Semi-essential amino acids are of great importance. They support the health and well-being of human beings. They are equally important as essential amino acids and should not be neglected.