Question

Amino acid alanine is
A. Basic
B. Mono-amino dicarboxylic
C. Sulphur containing
D. Monoamino monocarboxylic

Answer 1

Amino acids are the monomers that can be combined to form polymers and make the proteins, and these amino acids are the building blocks of proteins, and both proteins and amino acids are very essential, they have an important constituent of biological structures.

Complete answer: Amino acids are the organic compounds that consist of the Amine and carboxyl group along with chain R, where it is specific in each amino acid, and the components of the amino acids are carbon, oxygen, hydrogen, and nitrogen.
There are many known amino acids, and these amino acids are classified in many ways and mainly by the shape and the specific R chain.
They are classified into various types such as aliphatic and aromatic, and they are also classified as acidic and basic.
Based on their availability also they are classified as essential and non-essential, where the nonessential amino acids are the one which can be synthesized within the body, so there is no need to be supplied through diet, but essential amino acids are one which cannot be synthesized and they can only be supplied through diet.
Alanine is an aliphatic amino acid as it contains carbon as a methyl group which is attached to the alpha chain, and it consists of both amino and carboxylic groups.
This is nonessential amino acids which means it can be synthesized in the body and it can also be found in animal sources such as meat.
In mammals, this alanine plays an important role such as glucose alanine cycle which occurs with the liver, and in this cycle alanine and alpha-ketoglutarate are formed by the enzyme alanine aminotransferase, and this alanine has other important functions also.
So the correct option is D.

Note: This alanine has one amine group and one carboxyl group which is attached to the carbon of methyl group, so this alanine is considered as Monoamine monocarboxylic, and it is nonpolar, the systematic name of this alanine is 2 amino propionic acid.