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Q.46 Which one of the following ecosystems is represented by an inverted pyramid of numbers? (A) Grassland (B) Pond (C) Desert (D) Parasitic forest Correct Answer The correct answer is (B) […]

Q.45. An uncharged protein (P) has an Asp in position 23 with a molecular weight of 6501 Da , as determined by mass spectrometry. The uncharged mutant of this protein […]

Q.44 X different sized DNA fragments can be observed upon incomplete EcoRI digestion of identical DNA molecules with two EcoRI sites as shown below. The maximum value of X is […]

Q.43 The C-terminal carboxyl group and the N-terminal amino group in amino acids have a dissociation constant ( 𝐩𝐊𝐚 ) of 2.2 and 9.2 , respectively. The 𝐩𝐊𝐚 of side […]

Q.42. Absence of detectable protein expression upon blunt-ended mutation-free cloning of an E.coli gene with its own promoter in E. coli cells can be due to (A)Cloning occurred in reverse […]

Q.41 The crystal structure of a peptide has an ordered structural repeat of amino acids with a distance of ∼ 𝟔. 𝟓Å between the alternate 𝐂𝜶 atoms. Which one of […]

Q. 40 Which one of the following is an incorrect biomolecule-modification pair? (A)Lipid – Palmitoylation (B) DNA and Protein – Methylation (C) Protein – Glycosylation (D) RNA – Polyadenylation The […]

Q. 39 DpnI is used to digest the PCR product during site directed mutagenesis because (A) DpnI digests irrespective of methylation status of DNA (B) DpnI digests only unmethylated DNA […]

Q.38 The enzyme NOT involved in oxidation of the molecule shown below is (A)Δ3, Δ2- Enoyl –CoA isomerase (B) Propionyl-CoA caboxylase (C) Acyl CoA dehydrogenase (D)Enoyl CoA hydratase Introduction Oxidation […]

Q.37. The ascending order of half-life for the radioactive isotopes, 125I, 3H, 14C and 32P, is: (A) 14C < 125I < 3H < 32P (B) 32P < 3H < 125I […]