Which of the following statement is correct about DNA agarose gel electrophoresis:____
A. When melting the gel, it has to be heated thoroughly, with boiling for a while, then stop heating to transfer the melted gel into the gel tank.
B. The DNA bands could be observed directly after gel electrophoresis, since the loading buffer contains indicator.
C. Linear DNA molecules with different length hold different electrophoretic mobility.
DNA molecules with same length hold the same electrophoretic mobility.
查看答案
Which of following is the best choice for storage of extracted DNA sample:____
A. ultrapure water
B. TE buffer
C. 75% ethanol
D. TBE buffer
What is the purpose of adding isopropanol:____
A. complete grinding of the sample
B. polysaccharide precipitation
C. protein denaturation
DNA precipitation and elimination of small RNA molecules.
Which of the following statement about nucleic acid hybridization is correct:____
A. It could happen between two DNA strands from different sources
B. It could happen between DNA and RNA strands from different sources
C. It could happen between RNA strand and its encoded peptide
D. Hybridization process is based on the DNA denaturation and renaturation
E. The hybridization techniques could be used to study the structure and function of nucleic acids.
Which of the following statement about DNA renaturation is correct:____
A. The renaturation takes place among two complementary strands of the denatured DNA molecule
B. The bigger of the DNA molecule is, the longer of the renaturation time will be
C. The heat-denatured DNA would renature only if it is cooled down slowly
D. The denaturation could happen among DNA and RNA strands
E. The heat-denatured DNA would quickly renature under the low temperature
微信支付 
支付宝支付