Choose the correct answer among the following Brush border enzymes are

Options

A. Maltase, sucrase, lactase
B. Trypsin, chymotrypsin, carboxypeptidase
C. Amylase, nuclease, lipase
D. Nucleotidase, nucleosidase, amylase

Answer

**Step-by-Step Solution:**

1. **Understanding Brush Border Enzymes**: Brush border enzymes are specific enzymes located on the microvilli of the intestinal epithelial cells in the small intestine. They play a crucial role in the final stages of digestion.

2. **Identifying the Enzymes**: The primary brush border enzymes include maltase, sucrase, and lactase. These enzymes are responsible for breaking down disaccharides into monosaccharides:
- **Maltase**: Converts maltose (a disaccharide) into two glucose molecules (monosaccharides).
- **Sucrase**: Converts sucrose (a disaccharide) into glucose and fructose (both monosaccharides).
- **Lactase**: Converts lactose (a disaccharide) into glucose and galactose (both monosaccharides).

3. **Evaluating the Options**:
- **Option 1**: Maltase, sucrase, and lactase - These are all brush border enzymes, making this option correct.
- **Option 2**: Trypsin, chymotrypsin, carboxypeptidase - These are pancreatic enzymes involved in protein digestion, not brush border enzymes. Thus, this option is incorrect.
- **Option 3**: Amylase, nuclease, and lipase - Amylase is a pancreatic enzyme, nuclease is involved in nucleic acid digestion, and lipase is for fat digestion. None are brush border enzymes, so this option is incorrect.
- **Option 4**: Nucleotide and nucleosidase - These enzymes act on nucleotides and are not classified as brush border enzymes. Therefore, this option is also incorrect.

4. **Conclusion**: After evaluating all the options, the only correct answer is **Option 1: Maltase, sucrase, and lactase**.