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• 5. For the double-strand break repair of DNA, several proteins are directly involved, such as_______
• 6. Please estimate the molecular weight (g/mole) of a plasmid DNA of E. coli that contains 3000 base
• 7. For different IgG molecules, antibody diversity is generated by_____.(A) alternative splicing of
• 8. Tay-Sachs disease is caused by deficiency of_____.(A) ceramidase (B) sphingomyelinase (C) beta-ga
• 9. Which amino acid is the substrate for NO synthetase to form nitric oxide (NO)?(A) Glutamine. (B)
• 10. Cholesterol can act as a precursor for each of the following compounds except_____.(A) chenodeox
• 11. The p53 gene (tumor suppressor gene) product is_____.(A) a G protein (B) a DNA-binding protein (
• 12. Pyridoxal phosphate is a cofactor for which of the following enzymatic reaction?(A) Fixation of
• 13. Which of the following enzymes converts stearoyl-CoA to oleoyl-CoA?(A) △5desaturase. (B) △6desat
• 14. All of the following compounds are intermediates of the Kreb cycle except_______ .(A) isocitrate
• 15. If the numbering of fatty acids in the carboxyl carbon is number 1, which carbon in palmitic aci
• 16. The following techniques could be potentially employed as a tool in gene therapy except_______ .
• 17. In glycoproteins, the carbohydrate moiety is always attached through the amino acid residues____
• 18. Sphingosine is not a component of_______.(A) cardiolipin (B) ceramide (C) cerebrosides (D) gangl
• 19. The ion channel that opens in response to acetylcholine is an example of a ____________ signal t
• 20. A monoclonal antibody differs from a polyclonal antibody in that monoclonal antibodies_______.(A
• 21. Below is a diagram of two DNA strands that are part of the coding region of gene.What is the seq
• 22. The human genetic disease phenylketonuria (PKU) can result from_______.(A) lack of phenylalanine
• 23. Which of the following descriptions is not correct?(A) The leucine zipper motif is important for
• 24. “The knock-out mice” is an important animal model for biomedical research. One of the most impor
• 25. If a sample of DNA is found to have the base composition (molar ratios) of adenine, 40； thymine,
• 26. Which of the following statements concerning cyclins is not correct?(A) They catalyze the phosph
• 27. That the nature of genetic material is DNA is based on_______ .(A) the transforming material is
• 28. Which one of the following statements relating to the common amino acids is correct?(A) Glutamin
• 29. Which one of the following statements relating to lipids and membrane is correct?(A) The non-pol