110年 - 110 國立中央大學_碩士班招生考試_生命科學系/植物暨微生物環境生物學組(一般生):生物化學Ⅰ(含代謝)#105332

選擇題 (12)

1. Which of the following enzymes that converts atmospheric N into the biological usable form? (A) amino acid oxidase (B) amino transferase (C) glutamine synthetase (D) glutamate synthase (E) nitrogenase

2. Lactose is formed (A) by a reaction catalyzed by lactase. (B) when water molecules are added to two monosaccharides. (C) when ionic bonds link two monosaccharides. (D) by aβ1→4 linkage between a galactose and a glucose molecule. (E) when glucose and fructose are combined.

3. Which of the following best describes the general structure of a cell membrane? (A) a layer of protein coating a layer of phospholipid (B) protein embedded in two layers of phospholipid (C) phospholipid embedded in two layers of protein (D) protein sandwiched between two layers of phospholipid (E) any of the above

4. Which of the following statements for proteins is correct?
(i) The four levels of structure of a protein are determined by its primary sequence.
(ii) Secondary structure includes mainly o helix and B sheet.
(iii) Collagen has four levels of structure. (A)i (B)i,ii (C)ii,iii (D)i,iii (E)i, ii,ii

5. Which one of the following is not a characteristic of the chloroplast ATP synthase? (A) It is a protein complex (B) It requires the input of NADPH (C) It transports H⁺from the thylakoid compartment to the stroma (D) It couples the flow of H⁺ to the phosphorylation of ADP (E) All are correct.

6. The first high-energy product formed in glycolysis is (A)3-phosphoglycerate (B)1,3-bisphosphoglycerate (C) Dibydroxyacetone 3-phosphate (D)Glyceraldehydes 3-phosphate (E) Phosphoenolpyruvate

7. Which of the following TCA cycle enzymes catalyzes a substrate level phosphorylation (A) Isocitrate dehydrogenase (B) a-Ketoglutarate dehydrogenase (C) Isocitrate debydrogenase (D)Succinate dehydrogenase (E) Succiny1-CoA synthetase

8. Complete β-oxidation of palmitoy1 CoA can theoretically produce how many molecules of ATP? (A) 88 (B) 96 (C) 117 (D) 131 (E) 140

9. What kind of the interaction occurs mainly between histones and DNA? (A) Covalent (B) Hydrogen bonding (C) Hydrophobic (D) Hydrophilic (E) Ionic

10. Rubisco catalyzes the carboxylation and oxygenation of ribulose 1,5-bisphosphate (RuBP). The first products of these reactions are? (A) 2-phosphoglycolate (B) Glyceraldehyde 3-phosphate (C) 2-phosphoglycolate & 3-phosphoglycerate (D) Glyceraldehyde 3-phosphate & 3-phosphoglycolate (E) Glyceraldehyde 3-phosphate & 2-phosphoglycolate

11. The migration of a protein on a SDS polyacrylamide gel is best described as inversely proportional to (A) protein complex size (B) positive charge (C) negative charge (D) log of molecular weight (E) log of isoelectric point

12. What is the definition of Tm (melting temperature) of DNA? (A) The temperature at which DNA molecules start to denature (B) The temperature at which all DNA molecules are denatured (C) The temperature at which half of DNA molecules are denatured (D) The temperature at which all GC bases are denatured (E) The temperature at which half of GC bases are denatured