34. The function of DNA topoisomerases is:
(A) packaging DNA into nucleosomes,
(B) forming cruciform DNA,
(C) unwinding G:C rich areas in DNA,
(D) breaking one or more strands of DNA, winding them tighter or looser, and rejoining the ends,
(E) promoting DNA hybridization.

1. The α-helix and β-strand are: (A) primary structure, (B) secondary structure, (C) tertiary structure, (D) quaternary structure, (E) regular structure.

2. What is the active form of methionine and acts as an intracellular methyl group donor? (A) S-adenosylhomocysteine, (B) homocysteine, (C) S-adenosylmethionine, (D) 5-methylthioadenosine, (E) None of the above.

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

4. A Ramachandran plot shows (A) the amino acid residues which have the greatest degree of rotational freedom, (B) the sterically allowed rotational angles between R groups and α-carbons in a peptide, (C) the sterically allowed rotational angles between Cα and the amide nitrogen (Cα-N) as well as between Cα and the amide carbonyl carbon (Cα-CO), (D) the sterically allowed rotational angles about the amide nitrogen (NH) and CO, (E) the amino acid residues that form α-helix, β-sheet, etc.

5. The two enzymes that catalyze the bulk of the nitrogen flow from amino acids to ammonium ion are? (A) transaminases and dehydratases, (B) transaminases and glutamate dehydrogenase, (C) transaminases and amino acid oxidase, (D) glutamate dehydrogenase and dehydratases, (E) amino acid oxidase and dehydratases.

6. Molecules of a given protein have all EXCEPT: (A) a fixed amino acid composition, (B) a defined amino acid sequence, (C) an invariant molecular weight, (D) a nucleotide sequence from which they are encoded, (E) a sequence read from C-terminal end to N-terminal end.

7. The peptide bond has partial ________________ character. (A) hydrogen bond, (B) double bond, (C) triple bond, (D) van der Waals bond, (E) all of the above.

8. A polypeptide "ala-ser-val-asp-leu-gly-glu" is folded into an α-helix. Which amino acid is the carbonyl group of alanine hydrogen bonded? (A) serine, (B) aspartic acid, (C) valine, (D) leucine, (E) glutamic acid.

9. Which amino acid acts as a helix breaker due to its unique structure? (A) histidine, (B) tyrosine, (C) arginine, (D) serine, (E) proline.

10. Biological molecules denaturation will occur in all EXCEPT: (A) dramatic increase in temperature, (B) change in ionic strength, (C) refrigeration, (D) addition of strong acid or base, (E) none, all will denature biological macromolecules.

114年 - [無官方正解]114 國立清華大學_碩士班考試入學試題_生命科學暨醫學院甲組(生物與醫學科學組)﹕生物化學#132802

114年 - [無官方正解]114學年度學士後獸醫學系招生試題-生物化學#131167

114年 - [無官方正解]114 台灣綜合大學系統_學士班轉學生聯合招生考試：生物化學#129347

114年 - [無官方正解]114 國立臺灣大學_轉學生招生考試試題：生物化學概論#128196

114年 - 114 台灣聯合大學系統_碩士班招生考試試題_化學類：生物化學#126447

114年 - 114 國立成功大學_碩士班招生考試試題：生物化學#126226

114年 - 114 國立臺灣大學_ 碩士班招生考試試題：生物化學(C)#125975

114年 - 114 國立臺灣大學_ 碩士班招生考試試題：生物化學(A)#125974

114年 - 114 國立臺灣大學_ 碩士班招生考試試題：生物化學(一般生物化學)#125973

113年 - [無官方正解]113 國立中正大學_碩士班招生考試試題_生物醫學科學系：生物化學#136966