Proteins1. (a)Explain what is meant by the primary structure of a protein molecule.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(2)

(b)Explain the role of hydrogen bonding in maintaining the structure of a globular protein such as insulin.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3)(c)Describe how the structure of a fibrous protein, such as collagen, differs from the structure of a globular protein.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3)(Total 8 marks)(2001 Jan)2. Give an account of the structures of the proteins insulin and collagen...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(Allow three lined pages)(Total 10 marks) (Jun 2001)3. Read through the following passage about protein structure, then write on the dotted lines the most appropriate word or words to complete the passage.Proteins are composed of long chains of monomers called ...............................................,which are linked together by ........................................................ bonds. These bonds areformed by ..................................................... reactions between adjacent monomers. Theprimary structure of a protein is the specific sequence of monomers in a polypeptidechain and determines the secondary and tertiary protein structure. The secondarystructure of a protein may be a coil, known as an ...............................................................which is held in shape by ............................................................. bonds between differentmonomers in the chain.(Total 5 marks) (Jan 2002)4. (a)Tertiary structure of a protein............(3)(Jun2002)