42. Which description below is NOT a trans-acting factor in transcriptional regulation?

(A) TATA box.

(B) TBP.

(C) HSF.

(D) Jun.

(E) Sp1.

43. Which of the descriptions below about RNA transcripts between prokaryotes and eukaryotes is INCORREСТ?(A) The mRNA in prokaryotes is processed to produce mature RNA.(B) In eukaryotes, the mRNA will add a cap at the 5' end and poly A tail at the 3' end.(C) In prokaryotes, RNA transcription occurs in the cytoplasm.(D) In eukaryotes, RNA transcription occurs in the nucleus.(E) In prokaryotes, the 23S, 16S, and 5S rRNAs are formed from a single primary transcript.

44. Which of the descriptions below about the spliceosome is WRONG?(A) Spliceosome is an RNA.(B) Spliceosome is a protein.(C) The spliceosome catalyzes the removal of DNA.(D) The spliceosome catalyzes the removal of protein.(E) None of all.

45. The secondary structure of proteins such as a-helices and ẞ-sheets is primarily stabilized by:(A) Disulfide bonds between cysteine residues.(B) Hydrophobic interactions among side chains.(C) Hydrogen bonds between backbone amide and carbonyl groups.(D) Ionic interactions between charged residues.(E) Van der Waals forces between aromatic rings.

46. Aspartate residues frequently participate in acid-base catalysis because they:(A) Are permanently negatively charged.(B) Cannot accept protons.(C) Can act as both proton donors and acceptors.(D) Are hydrophobic at physiological pH.(E) Form covalent enzyme-substrate bonds.

47. Which metabolite serves as an obligate activator of pyruvate carboxylase?(A) ATP.(B) NADH.(C) Citrate.(D) Acetyl-CoA.(E) Oxaloacetate.

48. Reduced LCAT activity most directly impairs:(A) VLDL secretion.(B) LDL receptor binding.(C) HDL maturation and cholesterol esterification.(D) Fatty acid ẞ-oxidation.(E) Bile acid synthesis.

49. Oxygen binding to hemoglobin is an example of:(A) Negative heterotropic regulation.(B) Positive homotropic regulation.(C) Competitive inhibition.(D) Irreversible activation.(E) Noncompetitive inhibition.

50. When estimating protein concentration by UV absorbance at 280 nm, which amino acid contributes most strongly?(A) Phenylalanine.(B) Tyrosine.(C) Histidine.(D) Tryptophan.(E) Arginine.

51.政府透過「環境標誌與宣告」讓消費者能選擇有利環境的產品，以下敘述何者正確？(A)綠色商品須透過外包裝標示詳盡解說，才能吸引民眾採購(B)商品標示環保標章可視為一種廣告行為，藉以爭取消費者認同(C)使用環保法規限制消費者須購買環保產品(D)使用有環保標章的冷氣機就可以放心一直吹冷氣。

52.「綠色商店」在引進商品時，可檢視商品是否有以下哪個標誌？(A)碳標籤(B) MIT標章(C)無障礙標章(D)安全蔬果標章。

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