17. Denaturation of proteins results in __ A. Disruption of primary structure B. Breakdown of peptide bonds C. Destruction of hydrogen bonds D. Irreversible changes in the molecule E. Damage to the amino acids 18. Proteins that constitute keratin, collagen and elastin in body are known as __ A. Protamines B. Phosphoproteins C. Scleroproteins D. Metalproteins E. Globulins 19. __ is a fatty acid which is NOT "synthesized in the body and has to be supplied in the diet A. Palmitic acid B. Lauric acid C. Linolenic acid D. Palmitoleic acid E. Oleic acid 20. __ is a phospholipid that acts as surfactant. A. Cephalin B. Phosphatidyl inositol C. Lecithin D. Phosphatidyl serine E. Glycerolphosph olipids

17. Denaturation of proteins results in __<br />C. Destruction of hydrogen bonds<br /><br />Denaturation of proteins involves the disruption of the secondary and tertiary structures of the protein molecule, which are stabilized by hydrogen bonds. The primary structure, which is the sequence of amino acids, remains intact. The peptide bonds between amino acids are not broken during denaturation.<br /><br />18. Proteins that constitute keratin, collagen and elastin in body are known as __<br />C. Scleroproteins<br /><br />Keratin, collagen, and elastin are structural proteins that provide strength and support to tissues. They are classified as scleroproteins, which are proteins that provide structural support to cells and tissues.<br /><br />19. __ is a fatty acid which is NOT synthesized in the body and has to be supplied in the diet<br />C. Linolenic acid<br /><br />Linolenic acid is an essential fatty acid, meaning it cannot be synthesized by the body and must be obtained through the diet. The other fatty acids listed can be synthesized by the body.<br /><br />20. __ is a phospholipid that acts as surfactant.<br />C. Lecithin<br /><br />Lecithin is a phospholipid that acts as a surfactant in the body. It helps to reduce surface tension and prevent the coagulation of blood cells.