Question

Give an example of
1) Globular proteins.
2) Naturally occurring optically inactive amino acid.

Answer 1

Hint: As we know that Globular protein is a kind of protein, which is made of polypeptide or chain of amino acid. They are joined together by peptide bonds. An optically inactive compound has a plane of symmetry passing through it.

Complete step by step answer:
1) Globular protein: Globular proteins are spherical in shape and soluble in water, acids, bases, neutral salt solution or alcohol. Example is hemoglobin.
a) Hemoglobin: Hemoglobin is represented as Hb; it is a protein molecule which is present in (RBCs) red blood cells. This molecule is responsible for carrying oxygen from the lungs to the other tissues of the body, and collects the carbon dioxide from the tissues and returns it to the lungs from the tissues and returns it to the lungs. Hemoglobin is made up of four protein molecules, two alpha-globin chains and two beta-globin chains. This molecule is responsible for carrying oxygen from the lungs to other tissues of the body, and collects the carbon dioxide from the tissues and returns it to the lungs. Each of globulin chain contains an iron containing porphyrin compound called heme. Heme compound contains iron atom in it and is crucial for oxygen and carbon dioxide transportation in our blood.
2) Naturally occurring optically inactive amino acid.
(a) Glycine:

Glycine is the amino acid that is not optically inactive because it does not have a side chain when compared to other amino acids like Alanine, Leucine etc and also glycine can’t retain its optical state. So it’s a unique type of amino acid. To be an optically active molecule, it should contain asymmetric carbon. Glycine which is the simplest amino acid has not an asymmetric carbon atom, because of that it’s not optically active.

Note: There are several enzymes, which are present in globular proteins. The bonds between amino acids are peptide bonds, but hydrogen bonds, disulfide bonds and ionic bonds, they work together for making a secondary and tertiary structure.