91. 如下圖所示之電路，電路中 I_x 為多少 ? 台中捷運 111

(A)10A
(B)–10A
(C)–8A
(D)–5A

1. By adding SDS (sodium dodecyl sulfate) during the electrophoresis of proteins, it is possible to: (A) determine a protein’s isoelectric point (B) determine an enzyme’s specific activity (C) determine the amino acid composition of the protein (D) preserve a protein’s native structure and biological activity (E) separate proteins exclusively on the basis of molecular weight.

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

3. When oxygen binds to a heme-containing protein, the two open coordination bonds of Fe2+ are occupied by (A) one O atom and one amino acid atom (B) one O2 molecule and one amino acid atom (C) one O2 molecule and one heme atom (D) two O atoms (E) two O2 molecules.

4. Which of the following parts of the IgG molecule are not involved in binding to an antigen? (A) Fab (B) Fc (C) Heavy chain (D) Light chain (E) Variable domain

5. How is trypsinogen converted to trypsin? (A) A protein kinase-catalyzed phosphorylation converts trypsinogen to trypsin (B) An increase in Ca2+ concentration promotes the conversion (C) Proteolysis of trypsinogen forms trypsin (D) Trypsinogen dimers bind an allosteric modulator, cAMP, causing dissociation into active trypsin monomers (E) Two inactive trypsinogen dimers pair to form an active trypsin tetramer.

6. Which of the following is not a reducing sugar? (A) Fructose (B) Glucose (C) Glyceraldehyde (D) Ribose (E) Sucrose.

7. In DNA sequencing by the Sanger (dideoxy) method (A) radioactive dideoxy ATP is included in each of four reaction mixtures before enzymatic synthesis of complementary strands (B) specific enzymes are used to cut the newly synthesized DNA into small pieces, which are then separated by electrophoresis (C) the dideoxynucleotides must be present at high levels to obtain long stretches of DNA sequence (D) the role of the dideoxy CTP is to occasionally terminate enzymatic synthesis of DNA where Gs occur in the template strands (E) the template DNA strand is radioactive

8. Which of the following contains an ether-linked alkyl group? (A) Cerebrosides (B) Gangliosides (C) Phosphatidyl serine (D) Platelet-activating factor (E) Sphingomyelin

9. A compound containing N-acetylneuraminic acid (sialic acid) is (A) cardiolipin (B) ganglioside GM2 (C) phosphatidylcholine (D) platelet-activating factor (E) sphingomyelin

10. Which of these statements about the composition of biological membranes is false? (A) In a given eukaryotic cell type (for example, a hepatocyte), all intracellular membranes have essentially the same complement of lipids and proteins (B) The carbohydrate found in membranes is virtually all part of either glycolipids or glycoproteins (C) The plasma membranes of the cells of vertebrate animals contain more cholesterol than the mitochondrial membranes (D) The ratio of lipid to protein varies widely among cell types in a single organism (E) Triacylglycerols are not commonly found in membranes

115年 - 第四章 直流網路分析：補充題 92-146#146599

115年 - 第三章 串並聯電路：補充題 91-144#146589

115年 - 第四章 直流網路分析：補充題 37-91#146575

115年 - 第三章 串並聯電路：補充題 41-90#146570

115年 - 第五章 電容及靜電：補充題 39-78#146547

115年 - 第六章 電感及電磁：補充題 41-100#146543

115年 - 第二章 電阻：補充題 41-119#146531

115年 - 第一章 電學基本概念：補充題 45-80#146529

114年 - 第6章 電感及電磁：6-3 電磁感應#129459

114年 - 第6章 電感及電磁：6-2 電磁效應#129455