8. The source of maltose in the intestine is activity: -amylase y-amylase sucrase -isomaltase complex isomaltase B-glycosidase complex

The source of maltose in the intestine is primarily due to the activity of the **α-amylase** enzyme. <br /><br />**Explanation**: α-Amylase is an enzyme that breaks down starch into smaller carbohydrate molecules, including maltose. In the digestive system, α-amylase, which is secreted by the salivary glands and the pancreas, helps to break down complex carbohydrates into simpler sugars. This process begins in the mouth and continues in the small intestine, where α-amylase further breaks down the starches into maltose and other disaccharides.<br /><br />The other options listed (β-amylase, sucrase-isomaltase complex, isomaltase, β-glycosidase complex) are also involved in carbohydrate digestion, but they do not primarily produce maltose. For example:<br />- **β-amylase** breaks down starch into maltose as well but is less active in the human digestive system compared to α-amylase.<br />- **Sucrase-isomaltase complex** breaks down sucrose into glucose and fructose and isomaltose into glucose.<br />- **Isomaltase** breaks down isomaltose into glucose.<br />- **β-glycosidase complex** is involved in breaking down various glycosides into their constituent sugars.<br /><br />Therefore, the primary source of maltose in the intestine is the activity of **α-amylase**.