Which of the following statement about a gene is NOT true:____
A. The whole DNA sequence responsible for synthesis of a functional protein or RNA molecule.
B. Polynucleotide sequence of DNA molecule that contains specific genetic information.
C. The minimal functional unit of genetic material.
D. The gene sequence consists of continuously arranged triplet codes.
查看答案
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.
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.
微信支付 
支付宝支付