6. Glucose can form 16 isomers. Mannose and galactose are glucose's:
(A) D and L isomers
(B) Epimers
(C) Alpha and beta anomers
(D) Aldose-ketose isomers

7. Tautomers are isomers of organic compounds that readily interconvert by a chemical reaction called tautomerization. Which of the following tautomerisms does exhibit in the oxo group of purines and pyrimidines? (A) lactam-lactim (B) amide-imidic acid (C) amine-imine (D) keto-enol

8. Which of the below is NOT involved in intron removal and the processing of mRNA precursors into mRNA? (A) U2 snRNA (B) U3 snRNA (C) U4 SRNA (D) U6 snRNA

9. Which one of the following descriptions about mutations is WRONG? (A) An adenosine replaced by a cytidine is a "transversion" mutation. (B) An adenosine replaced by a guanosine is a "transition" mutation. (C) A nonsense mutation results in a different amino acid being inserted in the protein. (D) Silent mutation means a change at the DNA level that does not result in any change of amino acid in the encoded protein.

10. Which of the following product will be synthesized in platelets and upon release cause vasoconstriction and platelet aggregation? (A) Thromboxanes (B) Prostacyclins (C) Leukotrienes (D) Lipoxins

11. Prostanoids are synthesized by: (A) Pentose phosphate pathway (B) B-oxidation pathway (C) Lipoxygenase pathway (D) Cyclooxygenase pathway

12. In the lac operon, the CAP (cyclic AMP activator protein)-cAMP complex functions as: (A) A positive regulator (B) An operator (C) A repressor (D) All are wrong

13. The transcribed sequences complementary to the coding sequences above are:  5'-ACTGTATCGGAT-3' (coding)  3'-TGACATAGCCTA-5' (A) 5'-ACTGTATCGGAT-3' (B) 5'-ACUGUAUCGGAU-3' (C) 5'-ATCCGATACAGT-3' (D) 5'- AUCCGAUACAGU-3'

14. Which one of the following descriptions is WRONG? (A) Caffeine is a trimethylxanthine. (B) Theophylline is a dimethylxanthine. (C) Theobromine is the bypoxanthine derivative of cocoa. (D) Theobromine and theophylline are similar but lack the methyl group at N-1 and at N-7, respectively.

15. Which one of the following subunits is NOT contained in the basic DNA-dependent RNA polymerase of the bacterium Escherichia coli? (A) α subunit (B) β subunit (C) ω subunit (D) σ subunit

16. Which of the following descriptions about apolipoproteins is CORRECT? (A) Apo A-I is the ligand for LDL receptor, while Apo B-100 binds to HDL receptor. (B) Nascent VLDL and nascent chylomicron both contain Apo C and E. (C) Apo C-II serves as the enzyme cofactor of lipoprotein lipase. (D) Apo B-48 on VLDL and Apo B-100 on LDL were encoded from two different genes, and the peptide sequence homology are about 70%. (E) Apo B-100 contains LDL receptor binding domain, but Apo-E cannot bind to LDL receptor.

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