Question

Pulses usually lack amino acids
(a)Methionine and tryptophan
(b)Cysteine and methionine
(c)Cysteine and tryptophan
(d)Methionine only

Answer 1

Hint Amino acids are known as the smallest units of proteins and play many important roles in your body. Mainly they’re needed for vital processes like protein building and include functions such as synthesis of hormones and neurotransmitters.

Complete answer:
Pulses can contain up to 21–25% protein approximately but can have small quantities of essential amino acids such as methionine, tryptophan, and cysteine. The protein content and amino acid composition mainly vary among different varieties of pulses and depend on, germination, environment, and application of fertilizers.
Pulse proteins are classified into two major types namely albumin and globulin.
Major storage proteins in pulse seeds are globulin and constitute 35–72% of total protein and the remaining fraction of protein mainly consists of albumins. Globulin proteins contain higher amounts of glutamine aspartic acid, arginine, and lysine while albumins contain higher amounts of cystine, methionine, and lysine contents as compared to globulin fractions in beans particularly.
In conclusion, pulses lack methionine and cysteine, substances which are rather found in cereals. Cereals, in turn, lack an essential amino acid, lysine, which is present only in legumes.

Additional information:
Short summary of the above-mentioned amino acids is given below
-Methionine is very unique among other amino acids. It basically contains sulfur and can produce other sulfur-containing molecules in the body. It is usually involved in beginning protein production in your cells.
-Tryptophan serves several significant purposes in adults including nitrogen balance growth in infants and is known to be an essential amino acid. It also helps in the formation of niacin, which is essential in creating the neurotransmitter serotonin.
-Cysteine is an amino acid important for protein production, and other metabolic functions. It is a main component of beta-keratin. It is the main protein found primarily in nails, skin, and hair. Cysteine is important for the formation of collagen.

So, the correct answer is ‘Cysteine and methionine’.

Notes: Globulins on one hand have a highly packed rigid structure due to the presence of disulfide bonds and hydrophobic interactions. Additionally among the four major classes of protein in pulses, albumins are unique due to their high solubility in water.