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question_answer1) Direction (1 - 21): In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. Assertion: D(+) - Glucose is dextrorotatory in nature. Reason: 'D' represents its dextrorotatory nature.
question_answer2) Assertion: Vitamin D can be stored in our body. Reason: Vitamin D is fat soluble vitamin.
question_answer3) Assertion: \[\beta \]-glycosidic linkage is present in maltose. Reason: Maltose is composed of two glucose units in which \[{{C}_{1}}\] of one glucose unit is linked to \[{{C}_{4}}\] of another glucose unit.
question_answer4) Assertion: All naturally occurring a-amino acids except glycine are optically active. Reason: Most naturally occurring amino acids have L-configuration.
question_answer5) Assertion: Glycine must be taken through diet. Reason: It is non-essential amino acid.
question_answer6) Assertion: Deoxyribose \[{{C}_{5}}{{H}_{10}}{{O}_{4}}\] is a carbohydrate. Reason: Carbohydrates are hydrates of carbon compounds which correspond to the formula \[Cx\left( {{H}_{2}}O \right)y\]
question_answer7) Assertion: Fructose reduces Fehling solution & Tollen's reagent. Reason: Fructose does not contain any aldehydic group.
question_answer8) Assertion: \[{{K}_{a}}\] values of \[\alpha \]-amino acids are very low. Reason: \[\alpha \]-amino acids have Zwitter ion structure.
question_answer9) Assertion: Cellulose is not digested by human beings. Reason: Cellolose is a polymer of \[\beta \]-D-glucose.
question_answer10) Assertion: Sucrose is a non-reducing sugar. Reason: Sucrose has glycosidic linkage.
question_answer11) Assertion: A solution of sucrose in water is dextro- rotatory but upon hydrolysis in the presence of dilute HCl, it becomes laevo rotatory. Reason: Sucrose on hydrolysis gives unequal amount of glucose and fructose as a result of which, change in sign of rotation is observed.
question_answer12) Assertion: The two strands in double strand helix structure of DNA are complementary to each other. Reason: Disulphide bonds are formed between specific pairs of bases.
question_answer13) Assertion: Glucose reacts with hydroxylamine to form an oxime and also adds a molecule of hydrogen cyanide to give cyanohydrin. Reason: The carbonyl group is present in the open chain structure of glucose.
question_answer14) Assertion: Glucose and fructose cannot be distinguished by silver mirror test. Reason: Glucose contains aldehydic group while fructose has ketonic group.
question_answer15) Assertion: Glucose gives a reddish brown precipitate with Fehling's solution. Reason: Reaction of glucose with Fehling's solution gives \[C{{u}_{2}}O\] and gluconic acid.
question_answer16) Assertion: The two strands in DNA are complementary. Reason: Cytosine always pairs with guanine and thymine pairs with adenine.
question_answer17) Assertion: Reaction of both glucose and fructose with excess of phenylhydrazine gives the same osazone. Reason: Both glucose and fructose are monosaccharides in nature.
question_answer18) Assertion: Millon's test is a test for the identification of proteins. Reason: Millon's reagent is a solution of mercurous nitrate and mercuric nitrate in nitric acid containing a little nitrous acid.
question_answer19) Assertion: All enzymes are made up of proteins and all proteins have three dimensional structures. Reason: is correct.
question_answer20) Assertion: Oxidation of glucose by \[B{{r}_{2}}\] water gives gluconic acid. Reason: \[B{{r}_{2}}\] water oxidises both -CHO and -OH groups.
question_answer21) Assertion: Enzyme hydrolysis of sucrose is called inversion. Reason: The configuration of sucrose gets inverted under these conditions.
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