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Q.15 During photorespiration under low CO2 and high O2 levels, O2 reacts with ribulose 1,5- bisphosphate to yield (A) one molecule each of 3-phosphoglycerate and 2-phosphoglycolate (B) two molecules of […]

Q.14 The direction of shell coiling in the snail Limnaea peregra is a classic example of (A) chromosomal inheritance (B) extra-chromosomal inheritance (C) chromosomal translocation (D) homologous recombination Shell coiling […]

Q.13 Protein-DNA interactions in vivo can be studied by (A) gel shift assay (B) Southern hybridization (C) chromatin immunoprecipitation assay (D) fluorescence in situ hybridization assay Protein-DNA interactions drive gene […]

Q.12 A truncated polypeptide is synthesized due to a nonsense mutation. Where would you introduce another mutation to obtain a full-length polypeptide? (A) Ribosomal protein gene (B) Transfer RNA gene […]

Q.11 A protein is phosphorylated at a serine residue. A phosphomimic mutant of the protein can be generated by substituting that serine with (A) glycine (B) alanine (C) aspartate (D) […]

Q.10 Choose the correct signal transduction pathway. (A) Hormone → 7 TM receptor → G protein → cAMP → PKA (B) Hormone → G protein → 7 TM receptor → […]

Q.9 Heat inactivation of serum is done to inactivate (A) prions (B) mycoplasma (C) complement (D) pathogenic bacteria Heat inactivation of serum at 56°C for 30 minutes primarily inactivates complement […]

Q.8 Nude mice refers to (A) mice without skin (B) mice without thymus (C) knockout mice (D) transgenic mice Nude mice are immunodeficient strains characterized by the absence of a […]

Q.7 Dimethyl sulfoxide (DMSO) is used as a cryopreservant for mammalian cell cultures because (A) it is an organic solvent (B) it easily penetrates cells (C) it protects cells by […]

Q.6 A humanized antibody is one in which the (A) heavy and light chains are from human (B) heavy chain is from human and light chain is from mouse (C) […]