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Q.34 Leguminous plants maintain a very low concentration of free oxygen in their root nodules because (A) the nitrogen fixing bacteria living in the root nodules are anaerobic (B) of binding […]

Q.33 Upon stimulation of a eukaryotic cell, the intracellular calcium (Ca2+) is released from (A) Endoplasmic reticulum (B) Nucleus (C) Peroxisome (D) Mitochondria The correct answer to Q.33 is (A) Endoplasmic reticulum, […]

Q.32 Match the hormones in Group I with their metabolic precursor in Group II Group I 17-β estradiol Thromboxane A2 Epinephrine Retinoic acid Group II Arachidonic acid Tyrosine β-carotene Cholesterol (A) […]

Q.31 The pair of amino-acids which does NOT undergo post-translational modification is (A) Asn-His (B) Tyr-Ser (C) Asn-Ser (D) Ala-Gly The correct answer to Q.31 is (D) Ala-Gly, as alanine and […]

Q.30 Which one of the following compounds does NOT block electron transport? (A) Cyanide (B) Rotenone (C) Oligomycin (D) Antimycin A Oligomycin inhibits ATP synthase but allows electron transport to […]

Q.29 Which one of the following amino-acids has highest fluorescence quantum yield (Φ) in aqueous solution? (A) Tyrosine (B) Tryptophan (C) Phenylalanine (D) Histidine Tryptophan exhibits the highest fluorescence quantum […]

Q.28 Which one of the following closely defines ‘Molten Globule’ state of a protein? (A) State with high degree of secondary structure and loss of tertiary structure (B) State with […]

Q.27 Which one of the following pairs of amino-acids in the protein has high propensity to take up the α-helix conformation? (A) Gly-Asp (B) Pro-His (C) Gly-Pro (D) Ala-Arg Ala-Arg […]

Q.26 Four proteins (P1, P2, P3 and P4) have 17, 10, 21 and 14 percent hydrophobic amino-acids respectively. The order of precipitation of these proteins using ammonium sulphate will be […]

Bromine water is decolourised upon reaction with (E)-3-hexene. Q.25 The structure of the product obtained is Key Concept: Reaction of Alkenes with Bromine Water Bromine water reacts with alkenes via […]