Final answer:
The villi of the small intestine contain more than four important enzymes that are crucial for digesting various nutrients, and they greatly increase the surface area for efficient nutrient absorption.
Step-by-step explanation:
The villi of the small intestine contain multiple enzymes that are essential for the digestion and absorption of nutrients. These enzymes, including peptidases, sucrase, maltase, and lactase, break down different types of molecules. For example, peptidases break down proteins into amino acids, while sucrase, maltase, and lactase break down disaccharides into monosaccharides (simple sugars). While the question asked provides options with specific numbers, in reality, villi contain more than just four important enzymes.
Additionally, villi are significant because they greatly increase the surface area through which nutrients can be absorbed. Villi, along with microvilli that cover them, ensure efficient nutrient absorption.
To answer another relevant question, three 'letters' or nucleotides (codons) of an RNA molecule are required to code for a single amino acid.