Question

Which of the following foodstuffs contain nitrogen?
A.Carbohydrates
B.Protein
C.Fats
D.None of these

Answer 1

We can say that nitrogen is found in all the organisms, majorly found in the form of amino acids in nucleic acids, and in transfer of energy molecule adenosine triphosphate. We have to know the human body has $3\%$ nitrogen by weight. We have to know that after carbon, oxygen, and hydrogen, the most abundant element in the human body is nitrogen.

Complete answer:
We have to know that other than atoms of carbon, oxygen, and hydrogen, all proteins consist of nitrogen. We have to know that protein is a large biological molecule that has one long chain (or) more than one long chain of carboxylic acid and amino acids. So, amino acids form large molecules known as proteins. We have to know in protein, there are twenty different amino acids and 100’s and 1000’s of these amino acids are connected to one another in long chains to give rise to proteins. Proteins are used by the body to tend tissues and build tissues. Enzymes, hormones, and other chemicals present in the body are produced by proteins.
We can say that there are two major classifications of proteins: Animal based protein and plant based protein.
Some of the animal proteins include whey, casein, beef, chicken, egg etc.
Some of the plant protein includes brown rice, pea, chickpea etc
The major difference between animal protein and plant protein is their nature of amino acids. Several of animal proteins consist of essential amino acids whereas plant proteins will not contain anyone of essential amino acid. So, protein is foodstuff which comprises nitrogen.

Option (B) is correct.

Note:
We have to ensure that a protein could be denatured. We know that there are three structures of proteins. Denaturation is destructing the tertiary structure/secondary structure/quaternary structure of protein and random polypeptide chains are formed. Denaturation of proteins occurs when protein is exposed to heat, acid (or) base.