141. Match the components of List I with List II.
List I (Marine Enzymes)                                                          List II (Source)
A. Chitinolytic enzymes                                                           I. Digestive tracts of fish, shellfish, squid liver, octopus saliva
B. Gastric proteases                                                                 II. Pyloric ceca, pancreatic tissues, intestines of sardine, cod & salmon
C. Polyphenol oxidases                                                          III. Fish viscera from fishery sources
D. Serine and cysteine proteases                                       IV. Crustaceans
(a) A-I, B-II, C-III, D-IV
(b) A-I, B-III, C-IV, D-II
(c) A-II, B-III, C-IV, D-I
(d) A-IV, B-III, C-II, D-I

Marine Enzymes: Sources and Functions

Marine enzymes play a pivotal role in the biology of marine organisms. They are involved in various biochemical processes, including digestion, immune response, and the breakdown of organic materials. Understanding the sources of these enzymes is essential for their application in biotechnology, food processing, and medical industries. Here’s a look at some important marine enzymes and their sources.

1. Chitinolytic Enzymes

• Source: Digestive tracts of fish, shellfish, squid liver, and octopus saliva.

• Role: Chitinolytic enzymes are responsible for breaking down chitin, a component of the exoskeleton of crustaceans and insects. These enzymes are crucial for the digestion of chitin and have applications in biotechnology, such as in the degradation of chitin-based waste.

2. Gastric Proteases

• Source: Pyloric ceca, pancreatic tissues, and intestines of sardines, cod, and salmon.

• Role: Gastric proteases play a significant role in the breakdown of proteins in the stomach. These enzymes are critical in the digestive systems of marine organisms, particularly fish, and are used in the food industry to process proteins from marine sources.

3. Polyphenol Oxidases

• Source: Fish viscera from fishery sources.

• Role: Polyphenol oxidases are enzymes that catalyze the oxidation of phenolic compounds. In fish and other marine organisms, these enzymes are involved in the browning of tissues. In food processing, polyphenol oxidases are used to control oxidation in various products like seafood and fruits.

4. Serine and Cysteine Proteases

• Source: Crustaceans.

• Role: These proteases are enzymes that break down proteins by hydrolyzing peptide bonds. In crustaceans, serine and cysteine proteases are involved in digestion and immune responses. They also have biotechnological applications, including in the production of protein hydrolysates and as industrial enzymes.

Correct Answer:

(a) A-I, B-II, C-III, D-IV

Conclusion

Marine enzymes are diverse in both function and origin. They play key roles in the biology of marine organisms and have a broad range of applications in various industries. By understanding the sources of these enzymes—whether from the digestive tracts of marine animals or from their viscera—researchers and industry professionals can harness these enzymes for biotechnology, food production, and other specialized applications.