Biochemistry: Notes

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1. Which of the following has net dipole moment : (A) CC14 (B) BF3 (0) NH3 (D) CO2 2. When milk is converted to curd its entropy : (A) Increases (B) Decreases (C) Remains the same' (D) None of the above 3. Given that : (1) C(s) + O2(g) -7 CO2(g), ∆H = -xkJ (2) 2CO(g) + O2(g) -7 2C02(g) ∆H = -ykJ The enthalpy of formation of carbon monoxide will be : (A) y - 2x (B) (2x - y)/2 (C)· (y - 2x)/2 (D) 2x - y 4. What type of isomerism the following compound can exhibit?

(A) Geometrical (B) Geometrical and optical (C) Optical (D) Tautomerism 5. The enzyme aldolase catalyses: (A) formation of fructose-6-phosphate from glucose-6-phosphate (B) oxidation of aldehyde group of glucose (C) conversionofglyceraldehyde-S'phosphateto dihydroxyacetonephosphate (D) formation of dihydroxyacetonephosphate and glyceraldehydephosphate from fructose 1, 6-bisphosphate 6. Carbohydrate chain is attached ·to glycophorin at (A) 16 residue (B) 17 residue (C) varies between 16-17 (D) 26 residues 7. G-protein is : (A) unimeric

(B) bimeric (C) trimeric (D) tetrameric 8. Membrane proteins are : (A) symmetrically placed (B) asymmetrically placed (C) aligned diagonally (D) arranged in zig-zag manner 9. The shape of cell may not be fixed (i.e. it changes) in : (A) lactobacillus (B) chlamydomonas (C) amoeba (D) spirochaetes 10. Cardiolipin is a membrane lipid and can be seen in : (A) mitochondria (B) chloroplast (C) bacteria (D) all of the above 11. ATPase an enzyme needed for muscle contraction is located in : (A) actin (B) troponin (C) myosm (D) all of the above 12. Ribozyme is alan (A) enzyme (B) nucleic acid (C) protein (D) both (A) and (B) above 13. Uniformly labelled C14-oxaloacetate is condensed with unlabelled acetyl-CoA. After a single run around the TCA cycle back to -oxaloacetate, what fraction of original radioactivity will be found in the oxaloacetate ? (A) all (B) 3/4 (C) 1/2 D) 1/4

14. An amino acid which is both ketogenic and glucogenic is (A) tyrosine (B)...
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