L -Erythrose, D -Threose b) D -Threose, D -Erythrose, L -Threose, L -Erythrose, c) L -Erythrose, L -Threose, D -Erythrose, D -Threose d) D -Erythrose, D -Threose, L -Erythrose, L -Threose . Which one given below is a non-reducing sugar? (NEET Phase – I) a) Glucose b) Sucrose c) maltose d) Lactose. .
Glucose (HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is a) Heptanoic acid b) -Iodohexane c) Heptane d) Heptanol . Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory. (AIIMS) Reason: Sucrose hydrolysis gives equal amounts of glucose and fructose.
As a result of this change in sign of rotation is observed. a)If both accretion and reason are true and reason is the correct explanation of assertion b) If both assertion and reason are true but reason is not the correct explanation of assertion c) If assertion is true but reason is false. d) if both assertion and reason are false. .
The central dogma of molecular genetics states that the genetic information flows from (NEET Phase – II) a) Amino acids Protein DNA b) DNA Carbohydrates Proteins c) DNA RNA Proteins d) DNA RNA Carbohydrates . In a protein, various amino acids linked together by (NEET Phase – I) a) Peptide bond b) Dative bond c) α - Glycosidic bond d) β - Glycosidic bond XII XII - - - - . Among the following the achiral amino acid is (AIIMS) a) -ethylalanine b) -methylglycine c) -hydroxymethylserine d) Tryptophan . The correct statement regarding RNA and DNA respectively is (NEET Phase – I) a) the sugar component in RNA is an arabinos and the sugar component in DNA is ribose b ) the sugar component in RNA is ’-deoxyribose and the sugar component in DNA is arabinose c ) the sugar component in RNA is an arabinose and the sugar component in DNA is ’-deoxyribose d ) the sugar component in RNA is ribose and the sugar component in DNA is