Which is correct about organelle genome:____
A. Several copies of the gene can be included in one organelle.
B. Consists of several chromosome.
Contains numerous short repeated DNA sequences.
DNA molecule in mitochondria and chloroplast is usually packaged with histones, to form chromatin structure.
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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.
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.
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