ABC26OR0501 · Treatment of the pentapeptide Gly-Arg-Phe-Ala-Ala, in separate experiments, with the enzymes Trypsin, Chemotrypsin and Carboxypeptidase A… · 2000-2022
ABC26OR0808 · Write the structure of E, F and G in the following scheme of reactions. · 2005-2022self-practice
ABC26OR0502 · In the reaction, Compound X is · 2000-2022self-practice
ABC26OR0809 · Given below are structure of some natural products. Identify them as vitamin A, B6, C and D and classify them according to their classes… · 2005-2022self-practice
ABC26OR0503 · Oxidation of X with chromic acid gives · 2000-2022
ABC26OR0810 · Which one of the following statements is Correct? · 2005-2022
ABC26OR0504 · Cyanogen bromide (CNBr) specifically hydrolyses the peptide bond formed by the C - side of · 2000-2022
ABC26OR0811 · Tollen's test will be negative for: · 2005-2022
ABC26OR0505 · In the following reaction, The absolute configurations of the chiral centres in X and Y are · 2000-2022
ABC26OR0812 · Which one among the following is a sesquiterpene? · 2005-2022
ABC26OR0506 · In the two steps reaction sequence: the major product Y is: · 2000-2022self-practice
ABC26OR0813 · Specific rotations of freshly prepared aqueous solutions of I and II are +112 and +18.7, respectively. On standing the optical rotation of… · 2005-2022
ABC26OR0507 · In the reactions, The major products X and Y, respectively are · 2000-2022
ABC26OR0814 · The pKa values of lysine are 2.18, 8.95 and 10.79. The isoelectric point of lysine is ____ · 2005-2022
ABC26OR0508 · The decreasing order of isoelectric point for the following alpha -amino acids is Lysine Alanine Glutamic acid (I) (II) (III) · 2000-2022
ABC26OR0815 · The most basic amino acid among the following is · 2005-2022
ABC26OR0509 · In the reaction sequence the major products, [X] and [Y] respectively, are · 2000-2022
ABC26OR0816 · Consider the following reaction: (D)-glucose [ cat. H+] Ph-NH-NH2 (3 equiv) X Among the following, the compound(s) whose osazone… · 2005-2022self-practice
ABC26OR0510 · The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'- AGCTACACT-3' is · 2000-2022
ABC26OR0817 · Among the following the correct statement(s) is/are · 2005-2022self-practice
ABC26OR0511 · Number of thymine residues in a 5000 kb DNA containing 23 \% guanine residues is: · 2000-2022
ABC26OR0818 · The maximum number of dipeptides that could be obtained by reaction of phenylalanine with leucine is · 2005-2022
ABC26OR0512 · A disaccharide that will not given Benedict's test and will not form osazone is · 2000-2022
ABC26OR0819 · The number of reducing sugars among the following is ____ · 2005-2022
ABC26OR0513 · The acid catalyzed cyclization of 5-ketodecan-1,9-diol is given below The most predominant sprioketal is · 2000-2022
ABC26OR0820 · The C-2 epimer of D-glucose is · 2005-2022
ABC26OR0514 · The correct sequence of the amino acids present in the tripeptide given below is · 2000-2022
ABC26OR0821 · Tetrapeptide(s) that gives (give) the following product on reaction with Sanger's reagent followed by hydrolysis is(are) · 2005-2022self-practice
ABC26OR0515 · The major product of the following reaction is · 2000-2022
ABC26OR0822 · The complementary strand for the following single strand of DNA is 5 A-T-G-C-T 3 · 2005-2022
ABC26OR0516 · Amongst the following, the structure of guanosine is · 2000-2022
ABC26OR0823 · In the following reaction of (D)-Glucose, a product P is formed. (D)-Glucose [2.\ H2O2, Fe2(SO4)3]1.\ Br2/H2O P Among the following… · 2005-2022
ABC26OR0517 · The compound given below is a (Hirsutene) · 2000-2022
ABC26OR0824 · The correct statement(s) among the following is/are · 2005-2022self-practice
ABC26OR0518 · A disaccharide does NOT give a positive test for Tollen's reagent. Upon acidic hydrolysis, it gives an equimolar mixture of two different… · 2000-2022
ABC26OR0825 · Based on the information given below, the isoelectric point (pI) of lysine is ____ (Round off to one decimal place) · 2005-2022
ABC26OR0519 · A tetrapeptide, made up of natural amino acids, has alanine as the N-terminal residue which is coupled to a chiral amino acid. Upon… · 2000-2022
ABC26OR0826 · The amino acid R configuration is · 2005-2022
ABC26OR0520 · Major product formed in the given reaction is: · 2000-2022
ABC26OR0827 · The nucleobase NOT found DNA is · 2005-2022
ABC26OR0521 · A correct example of a nucleotide is: · 2000-2022
ABC26OR0828 · The total number of head to tail isoprene linkages in the following molecule is · 2005-2022
ABC26OR0522 · A tripeptide on treatment with PhNCS(pH=8.0) followed by heating with dilute HCl afforded a cyclic com pound M and a dipeptide. The… · 2000-2022
ABC26OR0829 · The functional group (s) in reducing sugar that tests positive with Tollen's reagent is (are) · 2005-2022self-practice
ABC26OR0830 · Among the following, the total number of terpenes (terpenoids) is ____ . · 2005-2022self-practice
Natural Products – General
ABC26OR0073 · Papaverine on oxidation with potassium permanganate gives a ketone, which on fusion with potassium hydroxide gives Papaverine · JUNE 2011
ABC26OR0074 · The major product formed on nitration (HNO3/H2SO4 ) of uridine followed by reduction with tin and HCl is: · JUNE 2011
ABC26OR0075 · The major product formed in the reaction sequence is: · JUNE 2011
ABC26OR0078 · Degradation of penicillin G gives penicillamine that can utilize nitrogen, oxygen or sulfur atoms as donors to bind with lead (II), mercury… · DEC 2012
ABC26OR0079 · The biosynthetic precursor of cadinene is: Cadinene · DEC 2012