Question

The enzyme which converts starch into maltose is:
A.zymase
B.invertase
 C.diastase
 D. maltase

Answer 1

Hint: Starch and maltose are commonly known as carbohydrates. These are also called biomolecules. Starch is a poly carbohydrate of glucose. In starch glucose molecules are joined by glycosidic bonds. Maltose is another carbohydrate. It is a di carbohydrate of glucose.

Complete step by step answer:
-Enzyme is also one kind of protein present in the living body. Enzymes catalyze reactions in the biological system.
-Now starch gets hydrolysed by the enzyme amylase to the disaccharide maltose, found in the saliva of the mouth.
-Diastase is an enzyme which is used to catalyze the breakdown of starch into sugar maltose.

So, the correct option is C.

Additional information:
-Starch is a white colorless and odorless amorphous solid. Starch contains two kinds of structures one is amylose and other one is amylopectin. Amylose is a linear polymer of glucose. On the other hand, amylopectin is a cross-linked branched polymer of glucose. -There are about 20 to 25% of starch is amylose and 75 to 80 % is amylopectin.
-Maltose is a disaccharide of glucose. In this disaccharide two glucose molecules are joined by a glycosidic linkage between C1 carbon of one glucose and C4 carbon of another glucose. As a result, C1-OH is free in one glucose. As a result, it shows reducing character. That is why it is reducing sugar.

Note:
Sucrose is disaccharide of glucose and fructose. Sucrose is a non-reducing sugar because the glycosidic linkage between glucose and fructose is formed by the anomeric OH groups. In water solution of sucrose inversion of rotation of plane polarized light is happened, this is known as inversion of sucrose.