所屬科目:研究所、轉學考(插大)◆生命科學
13. Gel electrophoresis is often used in separating nucleic aci acid or proteins. The following is the set up of an agarose gel. The '-" and *t" signs indicate the orientation of the clectrodes. The black solid rectangles are the wells for loading sampics. Which descriptions for the setting is/are CORRECT? (A)Smaller DNA will move faster toward the end of the gel (B) Larger DNA will move slower toward the end of the gel (C) The DNA will move upward (D) The higher the percentage of the gel, the slower the DNA will move (E) RNA cannot be separated in the gel
24.Which of the following amino acids can absorb UV light? (A)(B)(C)(D)(E)
27.Choose the CORRECT statements describing the induction of B-galactosidase activity by isopropyl thiogalactoside (IPTG) in E coli. (A) IPTG stimulates the lac repressor funetion (B) IPTG induces the transcription of P-galactosidase. (C) IPTG binds is to the lac represso sor and i inhibits its activity. (D) IPTG inhibits β-galactosidase degradation. (E)The binding of lac repressor to the lac operator is suppressed by IPTG.