AQA ALEVEL BIOLOGY;DIGESTION $ ABSORPTION EXAM 2024

AQA ALEVEL BIOLOGY;DIGESTION $ ABSORPTION EXAM 2024 What is amylase for - ANSWER-Hyrdolyses alternate glycosidic bonds of starch molecule to produce maltose Where is maltase produced? - ANSWER-(In the cell membrane of epithelial cells) Small intestine Maltose - ANSWER-glucose + glucose Where is maltase secreted? - ANSWER-Small intestine (In the epithelial cells of the small intestine) Lining of ileum Role of maltase - ANSWER-Hyrdolyses maltase into monosaccharide (alpha glucose) Process of carbohydrate digestion - ANSWER-- Saliva breaks down and hydrolyses food to maltose (neutralises pH) - Acid in stomach denatures amylase preventing hyrdolysis of starch - Food into pancreas where pancreatic juices hydrolyse starch to maltose Process of carbohydrate digestion (muscles in intestine) - ANSWER-Muscles in intestine wall push food along ileum Epithelial lining produces the disaccharide maltase (part of cell surface membrane of epithelial cells) MEMBRANE BOUND DISACCHARIDE Sucrase - ANSWER-hydrolyses sucrose into glucose and fructose Lactase - ANSWER-an enzyme that catalyzes the hydrolysis of lactose to glucose and galactose. What are the roles of the glands in the digestive system? - ANSWER-To produce digestive juices Name two types of glands in the digestive system - ANSWER-Pancreatic glands Salivary glands