43 Clinically important glucosides are called _____________
Answer : Cardiac glucosides
44 . The aglycon of glucoside may be _________ or ____________
Answer : Sterol ,phenol
45 . Give one example for: Cardiac glucoside
Answer : Digitonin
46 . The aglycon of digitonin is a ____________
Answer : Steroid
47 . Two glucose molecules of maltose combined by _____________
Answer : Glucosidic linkage
48 . In the formation of maltose condensation occurs between ____________ and _________
Answer : Hydroxyl group of glucose 1 at carbon – 4 and hydroxyl group of glucose 2 at carbon 1 ( one water molecule is liberated )
49 : In maltose the free aldehyde in the first glucose molecule has the property of _____________
Answer : Reducing sugar
50 . The end product of digestion of starch is _____________
Answer : Maltose
51 . Starch is digested by the enzyme ___________ in the mouth and ____________ in the intestine .
Answer : Salivary amylase or ptyalin , pancreatic amylase
52 . Maltose is split into two molecules of glucose by the enzyme ______________
Answer : Maltase
53 : Maltose forms osazones with ___________
Answer : Phenylhydrazine
54 : The sugar present in the milk of mammals are ____________
Answer : Lactose
55 : One lactose molecule consists of ___________ and _________
Answer : Glucose , galactose
56 : Lactose can reduce alkaline copper solution . Why ?
Answer : Because of the presence of aldehyde group in the glucose molecule .
57 . Which sugar is present in the urine of pregnant and lactating women ?
Answer : Lactose
58 . Which sugar is not fermented by yeast ?
Answer : Lactose
59 . ‘Can sugar’ is ___________
Answer : Sucrose
60 . which disaccharide is present in honey?
Answer : Sucrose
61 . Sucrose is a non – reducing sugar . Why ?
Answer : Because sucrose molecule has no free reducing group .
62 .Which sugar is present in pineapple ,beetroot and sugar cane ?
Answer : Sucrose
63 . In which region glucose and fructose molecule of sucrose is linked ?
Answer : The linkage is between the carbon of the aldehyde group of glucose and the carbon of the ketone group of fructose .
64 . What is’ invert sugar ‘ ?
Answer : The product of hydrolysis of sucrose consists of glucose and fructose is called ‘ invert sugar ‘ .
65 . Invert sugar is levorotatory . Why ?
Answer : Due to the presence of fructose . ( before hydrolysis sucrose is dextrorotatory )
66 . What is the composition of starch ?
Answer : Starch is a mixture of two types of molecules namely amylase and amylopectin .
67 . What is the difference between amylose and amylopectin in the arrangement of glucose molecules?
Answer : In amylose glucose molecules are arranged in a linear form but in amylopectin glucose molecules are arranged in a highly branched form .
68 .What is the inner portion of the starch grains ?
Answer : Amylose
69 . The outer covering of the starch grain is ____________
Answer : Amylopectin
70 . What is starch paste ?
Answer : The mixture of amylose and amylopectin in water is called starch paste.
71 . Which is the animal starch?
Answer : Glycogen
72 . Which polysaccharide is present in the honey?
Answer : Dextrin
73 . What are the three types of dextrin?
Answer : Amylodextrin , erythrodextrin and achrodextrin
74 present in the cell wall of plants ?
Answer : Cellulose
75 . What is the importance of cellulose in the human digestivetract?
76. Which polysaccharide is
Answer : Cellulose increases peristalsis and moves the bowel .
76 . What are the polysaccharides are not hydrolysed by the enzymes of the human digestive tract?
Answer : Cellulose and inulin
77 . Which polysaccharide is synthesized from sucrose by certain bacteria?
Answer : Dextran
78 . How many D – fructose units are present in one inulin molecule?
Answer : 30
79 . What are the anions are required for the hydrolysis of starch?
Answer: CL- , Br-
80 . What is optimum P H essential for amylase to hydrolyse starch in NaCl solution?
Answer : 6.9
81. Which enzyme is required for the complete hydrolysis of starch?
Answer : Oligo – 1 , 6 glucosidase ( act at the 1-6 branching points ,and disintegrate starch completely .
82 . What is the end product of hydrolysis of starch by acid?
Answer : Glucose
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