Lipases and nucleases are not present in pancreatic juice

- The incorrect statement is option 'A', which states that lipases and nucleases are not present in pancreatic juice.
- Lipases and nucleases are actually present in pancreatic juice and play important roles in the digestion of fats and nucleic acids, respectively.

Pancreatic juice composition:

- Pancreatic juice is a clear, alkaline fluid secreted by the exocrine cells of the pancreas. It contains a variety of enzymes that are crucial for the digestion and absorption of nutrients in the small intestine.
- The composition of pancreatic juice includes enzymes such as amylase, lipases, nucleases, trypsin, chymotrypsin, carboxypeptidase, and elastase.

Functions of lipases and nucleases in pancreatic juice:

- Lipases are enzymes that break down fats into smaller molecules called fatty acids and glycerol. They are responsible for the digestion and absorption of dietary fats. Lipases are present in pancreatic juice and help in the emulsification and hydrolysis of triglycerides.
- Nucleases are enzymes that break down nucleic acids, such as DNA and RNA, into their component nucleotides. They are important for the digestion and absorption of nucleic acids from ingested food. Nucleases are also present in pancreatic juice and aid in the breakdown of nucleic acids into nucleotides.

Other enzymes in pancreatic juice:

- Amylase is an enzyme that breaks down complex carbohydrates, such as starch and glycogen, into simple sugars like glucose. It is present in pancreatic juice and plays a crucial role in carbohydrate digestion.
- Trypsin, chymotrypsin, carboxypeptidase, and elastase are proteases that break down proteins into smaller peptides and amino acids. They are important for the digestion and absorption of dietary proteins. These enzymes are also present in pancreatic juice.

In conclusion, lipases and nucleases are indeed present in pancreatic juice and are important for the digestion of fats and nucleic acids, respectively. Therefore, option 'A' is the incorrect statement.