Explanation: IgG is the most commonly found immunoglobulin in the serum of humans. It is passed to the fetus from mother through the placenta. It has two antigen binding sites.

Explanation: The immunoglobulin molecules have 70-100 amino acids, which varies according to the functions they are involved in our body. The number of amino acids also depends upon their size.

Explanation: The immunoglobulin has two chains, the light chain and the heavy chain. Two light chains and two heavy chains are held together by disulphide bond.

Explanation: The cadherins is also known as calcium-dependent adhesion molecule. They require calcium ions for its transmembrane function.

Explanation: Cadherins contain around 720 to 750 amino acid molecules. These amino acids are synthesized by the posttranslational modifications made to the polypeptide chain.

Explanation: Protocadherins are abundant in the nervous system. They are present in neurons of our nervous system. A certain gene is present here to express the protocadherin protein.

Explanation: Epithelial mesenchymal transition is the property of cells losing adhesion and gaining migration. It is highly useful in the pluripotency of stem cells in organ development.

Explanation: Usher syndrome is an autosomal recessive genetic disorder caused by mutation. In this disorder the cadherin 23 is responsible for the deafness.