5. Which one of the followings is related to the production of diacylglycerol (DAG) from the membrane lipids?
(A) Phospholipase C;
(B) Phospholipase A;
(C) Phospholipase D;
(D) Phospholipase B

6. There are four levels in protein structure: primary, secondary, tertiary, and quaternary. The α-helix is in what level of protein structure? (A) Primary; (B) Secondary; (C) Tertiary; (D) Quaternary

7. The polyampholyte is an important character of a protein. What solution factor has the greatest effect on this protein property? (A) The temperature; (B) The solubility; (C) The ionic strength; (D) The acid-basic condition

8. Regarding to the structure of amino acids, which following description is incorrect? (A) Methionine has a sulfur-containing side chain (B) Phenylalanine is an aromatic amino acid (C) Serine is an aliphatic amino acid (D) Histidine is a basic amino acid

9. The globular protein folding is a thermodynamical process in physiological condition. Which following force of chemical binding interaction does not involve? (A) Van der Walls interactions; (B) Electrostatic interactions; (C) Hydrogen bonds; (D) Polypeptide bonds

複選題10. Regarding to biosynthesis of a protein in eukaryotes, which following description is correct? (A) The molecule of tRNA functions as a template of genetic information, and the rRNA serves as an anti-codon to synthesize specific amino acid (B) Protein synthesis occurs in the ribosome, via a specific aminoacyl-tRNA synthetase (C) The polypeptide synthesis requires an AUG as a start codon, while no specific termination codon is required. (D) The polypeptide chains undergo post-translational modification in endoplasmic reticulum

11. Aspartate transaminase catalyzes an amino group transfer from aspartate to (A) Glycine; (B) Tryptophen; (C) Glutamate; (D) Pyruvate

12. In urea cycle, urea is generated from which molecule? (A) Arginine; (B) Aspartate; (C) Glutamate; (D) Ornithin

13. Which molecule is a substrate of a DNA polymerase? (A) A nucleobase; (B) A nucleoside; (C) A nucleotide with one phosphate; (D) A nucleotide with three phosphates

14. 5-fluorouridine is an anticancer drug that inhibit the reaction of a (A) thymidylate synthase; (B) dihydrofolate reductase; (C) DNA polymerase; (D) Topoisomerase

15. A close circular plasmid DNA has a length of 3000 base pairs. What is its linking number in relaxed form? (A) Around 100; (B) Around 300; (C) Around 30; (D) 0

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