12. Mitochondrial and chloroplastic ribosomes resemble _____ ribosomes.
(A) prokaryotic
(B) lower eukaryotic
(C) higher eukaryotic
(D) no other
(E) None are true.

25. Mitochondrial and chloroplastic ribosomes resemble __ ribosomes.(A) prokaryotic(B) lower eukaryotic(C) higher eukaryotic(D) no other(E) none are true

13. Forensic uses of DNA to identify victims or criminals exploit the following trait in DNA: (A) Footprinting. (B) DNA with proteins bound moves slower in gel electrophoresis. (C) Site directed mutations. (D) Differences in sizes of DNA fragments (RFLPs). (E) None of the above.

14. Which of the following is normally found in a eukaryotic membrane? (1) Octylglucoside (2) Cholesterol (3) Sphingomyelin (4) Ganglioside GMI (5) Phosphatidylinositol (A) (1), (2), and (5) (B) (1), (2), (3), and (5) (C) (2), (3), (4), and (5) (D) (2), (3), and (5) (E) All of the above

15. Why do cells not have membrane transport proteins for O2? (A) Because oxygen can dissolve in the lipid bilayer and diffuse in and out rapidly without the need for a transporter. (B) Because oxygen can dissolve in water and leak in via water channels. (C) Because they need to keep the oxygen concentration low inside the reducing environment of the cell. (D) Because oxygen transport across a membrane is energetically unfavorable. (E) Because oxygen is transported in and out of the cell in special oxygen-carrying proteins such as hemoglobin.

16. Which of the following is required for the transport of proteins into the nucleus? (A) Signal peptidase (B) Nuclear localization signal (C) Translocon complex (D) Ubiquitin tag (E) Endoplasmic reticulum targeting sequence

17. Which component is directly responsible for initiating translation in eukaryotic cells? (A) mRNA cap-binding proteins (B) Ribosomal small subunit (40S) (C) tRNA (D) Golgi apparatus (E) RNA polymerase II

複選題18. The lysosome is primarily responsible for degrading (A) Misfolded proteins in the cytosol (B) Proteins tagged with ubiquitin (C) Extracellular material taken up by endocytosis (D) Lipids synthesized in the endoplasmic reticulum (E) Ribosomal subunits

19. Stem-cell populations are thought to exist in adult animals at which of the following organs? (1) skin  (2) intestine (3) bone marrow (A) all 3 organs (B) (2) (C) (3) (D) (1) and (3) (E) (2) and (3)

20. Which of the following statements regarding stem cells (SCs) is incorrect? (1) A stem cell can divide to one copy of itself and to one differentiated cell.  (2) Stem cells could be used to test new drugs. (3) The multipotent SCs showed higher differentiation potency than the pluripotent SCs. (A) (1) (B) (2) (C) (3) (D) (2) and (3) (E) (1) and (2)

21. Vesicular transport describes the budding and fusion behavior of vesicles. Which of the following statement(s) is   correct   regarding vesicular transport? (1) The vesicular transport process is ATP-dependent, as ATP is required for both the budding and fusion of vesicles. (2) COPI-coated vesicles are primarily involved in anterograde transport from the endoplasmic reticulum (ER) to the Golgi apparatus. (3) Dynamin is a GTPase that is responsible for the vesicle budding from the donor membrane during clathrin-mediated endocytosis. (A) 3 only (B) 1 and 3 (C) 2 and 3 (D) 1 and 2 (E) All of above are correct.

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