How do lectins achieve high specificity in binding to carbohydrates?

• A. Lectins alter the structure of carbohydrates to fit their binding sites.
• B. Lectins use covalent bonds to bind carbohydrates.
• C. Lectins bind to any carbohydrate indiscriminately.
• D. Lectins have specific binding sites that match the structure of particular carbohydrates.

Answer: (D)