Question

Our hair and nails contain

• A. Protein
• B. Calcium
• C. Chlorine
• D. Phosphorus

Answer 1

The correct option is A

Protein

The correct option is A.

Explanation of the correct option:

1. Nails and hair are made up of a tough protective protein called keratin.
2. Proteins are huge molecules composed of basic units called amino acids.
3. Proteins contain carbon, hydrogen, oxygen, nitrogen, and sulfur.
4. Protein molecules are large, complex molecules formed by one or more twisted and folded strands of amino acids.
5. Proteins are highly complex molecules that are actively involved in the most basic and important aspects of life.
6. These include metabolism, movement, defense, cellular communication, and molecular recognition.
7. While the hair grows in a hair follicle, nails grow from the matrix (the base of the nail bed).
8. Keratin is one of a family of fibrous structural proteins known as scleroproteins.

Explanations of the incorrect options:

Option B:

1. It is an important biomolecule that is present in the bones and teeth.

Option C:

1. Chlorine participates in the regulation of fluids and electrolytes in the body. It is also a key component of gastric juice.

Option D:

1. It is an important component of DNA and RNA. It is also present in teeth and bones.

Final answer: Our hair and nails contain proteins.