7. Which equation   defines   a system at equilibrium?
(A) AG ＞ 0,
(B)( ΔG° = AG,
(C) AG = 0,
(D) AG ＜ 0,
(E) AG = RT In ([products]/[reactants]).

1. What is the post-translational modification of phosphorylation: (A) -CH2COO-, (B) -CH3, (C) –NH2, (D) -COOH, (E) -PO3.

2. What is nonprotein part of Nucleoprotiens (A) Lipids, (B) Carbohydrate group, (C) DNA, (D) Heme, (E) Metal.

3. Alpha helix and beta sheet are: (A) Primary structure, (B) Secondary structure, (C) Tertiary structure, (D) Quaternary structure, (E) Regular structure.

4. What is the overall net charge on the peptide Arg-Ala-Ile-Lys-Glu-Tyr-Asp at pH 7.0? (A) +2, (B) +1, (C) -2, (D) 0, (E) -1.

5. A Ramachandran plot illustrates (A) glycine always located at the sterically allowed region, (B) displayed by three torsion angles, (C) the sterically disallowed rotational angles between Ca and the amide nitrogen (-N), (D) the sterically allowed rotational angles between side chains and β-carbons in a peptide, (E) the sterically allowed region for the secondary structure of protein.

6. What can be carried out by Edman degradation: (A) decide the C-terminal amino acid by a carboxypeptidase, (B) cut the protein into a multitude of smaller peptides, (C) determine the N-terminal residue, (D) connect overlapping sets of peptide fragments, (E) make two different, but overlapping sets of peptide fragments?

8. All of the following statements about cyclic sugars are true EXCEPT: (A) The a-anomer has the -OH of the anomeric carbon positioned on the same side of the sugar ring from the -CH2OH, (B) The five and six membered rings are more frequently observed due to stability, (C) In a chair conformation, the predominant form has the bulkiest substituents occupying equatorial positions, (D) The carbonyl carbon becomes a chiral center, (E) They can be formed by the intramolecular reactions to hemiacetals or hemiketals.

9. What is the name of this glycosaminoglycans ? (A) Hyaluronate, (B) Keratan sulfate, (C) Dermatan sulfate, (D) Chondroitin-4-sulfate, (E) Heparin. 

10. Which is the pro-R position in glycerol ? (A) 1, (B) 2, (C) 3, (D) 4. 

11. Lipids that spontaneously form micelles, monolayers and bilayers have what property? (A) waxy, (B) amphipathic, (C) polar, (D) bipolar, (E) polyisoprenoid.

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