Natural Products
39 questions in this chapter.
Study loop for Natural Products
1. Practise the PYQsPrevious-year questions, with answers
Alkaloids
ABC26OR0109 · Among the following, the natural product that is a steroid and contains an alpha, beta -unsaturated ketone is · JUNE 2017
ABC26OR0111 · The following natural product Enterodiol is a · DEC 2017
Amino Acids Peptides
ABC26OR0077 · Among the following, the amino acid which is basic in nature is: · JUNE 2012
Natural Products & – General
ABC26OR0488 · D-Glucose and D-fructose interconvert into each other in aqueous alkaline solution. Suggest a mechanism for the interconversion. · 2000-2022 self-practice
ABC26OR0795 · The complementary strand of DNA for the following single stranded DNA sequence, 5′–A–T–C–A–T–G–C–3′ is · 2005-2022
ABC26OR0489 · Proteins are biopolymers. The monomer units present in them are · 2000-2022
ABC26OR0493 · The pKa values for the three ionizable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively. The isoelectric point for the… · 2000-2022
ABC26OR0800 · Calculate the isoelectric point (p.I.) of lysine, given the pKa of alpha.NH3 is 8.95, pKa of side chain NH3 is 10.53 and pKa of alpha.COOH… · 2005-2022
ABC26OR0494 · contain a Statement with a Reason and an Assertion. For each question, choose the correct answer from the following four choices… · 2000-2022
ABC26OR0802 · The correct relationship within each pair of the natural products is: · 2005-2022
ABC26OR0498 · Select the correct pair of statements: (I) Complementary strands run antiparallel in a double stranded DNA. (II) The triplet codons… · 2000-2022
ABC26OR0805 · The complementary DNA sequence of the given DNA 5'-G-A-A-T-T-C-3' is: · 2005-2022
ABC26OR0499 · Sucrose is converted to a mixture of glucose and fructose in a pseudo first order process under alkaline condi tions. The reaction has a… · 2000-2022
ABC26OR0501 · Treatment of the pentapeptide Gly-Arg-Phe-Ala-Ala, in separate experiments, with the enzymes Trypsin, Chemotrypsin and Carboxypeptidase A… · 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
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
ABC26OR0814 · The pKa values of lysine are 2.18, 8.95 and 10.79. The isoelectric point of lysine is ____ IIT JAM 2016 · 2005-2022
ABC26OR0508 · The decreasing order of isoelectric point for the following alpha -amino acids is Lysine (I), Alanine (II), Glutamic acid (III) · 2000-2022
ABC26OR0815 · The most basic amino acid among the following is · 2005-2022
ABC26OR0510 · The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'–AGCTACACT–3' is · 2000-2022
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
ABC26OR0820 · The C-2 epimer of D-glucose is · 2005-2022
ABC26OR0822 · The complementary strand for the following single strand of DNA is 5' ← A-T-G-C-T → 3' · 2005-2022
ABC26OR0517 · The compound given below is a (Hirsutene) · 2000-2022
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
ABC26OR0827 · The nucleobase NOT found DNA is · 2005-2022
ABC26OR0521 · A correct example of a nucleotide is: · 2000-2022
ABC26OR0829 · The functional group (s) in reducing sugar that tests positive with Tollen's reagent is (are) · 2005-2022 self-practice
Natural Products – General
ABC26OR0098 · The biosynthetic precursor of abietic acid is · DEC 2014
ABC26OR0106 · Correct characteristics of the functional groups of adenine in DNA base pair are · DEC 2016
ABC26OR0116 · The keto-hexose among the following is · DEC 2018
ABC26OR0119 · The natural product that gives signal at delta 218 ppm in its 13 C NMR spectrum · DEC 2019
Steroids
ABC26OR0086 · The biosynthetic precursor for the steroids is · JUNE 2013
Terpenoids
ABC26OR0087 · Number of isoprene units present in lupeol is · JUNE 2013