2. A repeating structural unit in a multimeric protein is known as a(n):
(A) domain.
(B) motif.
(C) oligomer.
(D) protomer.
(E) subunit.

48. A: What happened？ You look a bit green. B: Nothing . . . just feeling . . . a little down. A: Hey！ Guess what I just bought！ A new video game！ It’s red-hot. __________ B: Sounds great！ (A) Can you stop looking down？ (B) Do you know where I bought it？ (C) Why not come to my place tonight？ (D) How much discount do you think they could offer？

複選題49.A: Oh！ You’re flying to England tomorrow. Are you all set for your big trip？(複選) B: I think so. It’s so difficult to figure out what to bring and what not to bring.  A: __________ B: No, I think I’m all set. A: In that case, I hope you have a great trip！ (A) Can you do me a favor？ (B) Need any help？ (C) Do you want a hand with anything？ (D) Are you ready to lend a helping hand？

複選題50.A: I just took the 1:30 p.m. Taroko Express from Hualien to Taipei, and I lost an iPad. B: Did you lose it in the train station or on the train？  A: I put it in my bag. My bag was on the overhead luggage rack, but now my iPad isn’t in the bag. I’m afraid it slipped out during the journey. B: I’m sorry. But don’t be upset. __________ (複選) (A) There’s still a good chance that it will show up. (B) I’ll help check with our lost and found to see if someone has picked it up. (C) I think you should return it to its rightful owner. (D) It might turn up in the lost and found

1. Choose the     correct     description. (A) Rhinoceros horn is hard and tough because it has high glucosamine content. (B) D-glucose is an anomer of L-glucose. (C) Lipoprotein is a dominant feature of the outer membrane of the cell wall of gram-negative bacteria. (D) Dithiothreitol could break the disulfide bond. (E) The peptide alanylglutamylglycylalanylleucine has five peptide bonds.

3. Please choose the correct answer from the following descriptions: (1) Amylose is unbranched; amylopectin and glycogen contain many (a1→4) branches. (2) Starch is the most abundant polysaccharide in nature. (3) Dextran is homopolysaccharide. (4) The galactose unit of the compound Gal(ẞ1→4)Glc residue is at the reducing end. (5) D-glucose and D-glucuronic acid is different on C6. (A) 1, 2, and 5 are     incorrect    . (B) 2 and 3 are correct. (C) 2 and 5 correct. (D) 1 and 3 are correct. (E) 1, 2, and 4 are     incorrect    .

4. Both water and glucose share an -OH that can serve as a substrate for a reaction with the terminal phosphate of ATP catalyzed by hexokinase. Glucose, however, is about a million times more reactive as a substrate than water. The best explanation is that: (A) Glucose has more -OH groups per molecule than does water. (B) The larger glucose binds better to the enzyme; it induces a conformational change in hexokinase that brings active-site amino acids into position for catalysis. (C) The -OH group of water is attached to an inhibitory H atom, while the glucose -OH group is attached to С. (D) Water and the second substrate, ATP, compete for the active site resulting in a competitive inhibition of the enzyme. (E) Water normally will not reach the active site because it is hydrophobic.

5. Which of the following is     not correct     concerning 2,3-bisphosphoglycerate (BPG)? (A) It binds at a distance from the heme groups of hemoglobin. (B) It binds with lower affinity to fetal hemoglobin than to adult hemoglobin. (C) It increases the affinity of hemoglobin for oxygen. (D) It is an allosteric modulator. (E) It is normally found associated with the hemoglobin extracted from red blood cells.

6. A monoclonal antibody differs from a polyclonal antibody in that monoclonal antibodies: (A) are labeled with chemicals that can be visualized. (B) are produced by cells from the same organism that produced the antigen. (C) are synthesized by a population of identical, or "cloned," cells. (D) are synthesized only in living organisms. (E) have only a single polypeptide chain that can recognize an antigen.

7. Which of the following statements of electron transport chain is     not true    ? (A) Complex I contains copper ions. (B) The final reduced species in the electron transport chain in mitochondria is H2O. (C) The P/O ratio refers to the number of moles of ATP produced for each mole of oxygen atoms consumed in electron transport. (D) Cytochrome c is a macromolecule which is loosely bound to the outer surface of the inner mitochondrial membrane. (E) None of the above.

8. Iron deficiency in a cell can adversely affect electron transport at which of the following sites: (A) Cytochrome b and cytochrome c. (B) Coenzyme Q and FADH2. (C) NADH and FADH2. (D) Coenzyme Q and NADH. (E) All sites in electron transport are affected.