Chapter 2 (Biological Molecules) F.Sc 1st Year Short Questions

How the size of a protein is determined?

The size of a protein molecule is determined by the type of amino acids and the number of amino acids comprising that particular protein molecule.

How many proteins are present in human body?

There are over 10,000 proteins in the human body which are composed of unique and specific arrangements of 20 types of amino acids.

Why the arrangement of amino acids in a protein molecule is highly specific for its proper functioning.

It is because if any amino acid is not in its normal place, the protein fails to carry on its normal function. For example in the sickle cell haemoglobin only one of the 574 amino acids do not occupy the normal place and the haemoglobin fails to carry any or sufficient oxygen, hence leading to death of the patient.

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What are the two main types of secondary structure of proteins?

  • cc-helix: It involves a spiral formation of the basic polypeptide chain.
  • B-pleated sheet: It is formed by the folding back of the polypeptides.

How tertiary structure of protein is maintained?

It is maintained by three types of bonds, namely ionic, hydrogen, and disulfide (-S-S-).

Give an example of the quaternary structure of the protein.

Haemoglobin, the oxygen-carrying protein of red blood cells, has a quaternary structure.

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