The properties of enzymes covered in Chapter 9 of NCERT Solutions for Class 11 Biology are:

• The enzymes are complex macromolecules with a higher molecular weight.
• The enzymes help break down larger molecules into simpler molecules by catalyzing the biochemical reactions occurring within the cell.
• Enzymes can only speed up a reaction.
• Enzymes have an impact on the biochemical reaction's rate, but they have no impact on the reaction's direction.
• Enzymes are action specific.
• At a pH level between 6 and 8, enzyme activity peaks.