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Which of the following binds specifically to a sequence of interest, thus facilitating the analysis of that sequence?

Which of the following is true for ethidium bromide? 

After performing DNA gel electrophoresis, the isolated bands in the kilobase size range appear too close together.  Which of the following would be the best way to improve the separation of the bands?

Which of the following is the correct karyotype for a normal female?

A PCR reaction is performed and the results are being analyzed.  The positive control has a band at the expected size, the negative template control has a band at the same size as the positive control; the contamination control has no band; the amplification control has a band of the expected size.  All of the patient samples that were run had a band the same size as the band seen in the positive and negative template control wells.  How should you interpret these results.  

Denatured proteins separated by gel electrophoresis and blot transferred onto a nitrocellulose membrane are probed with radioactive antibodies.  This procedure is called:

What is the yield of DNA from a sample with a concentration of 280 ug/mL and a volume of 0.5 mL?

DNA of interest  is extracted from a clinical sample.  The absorbance at 260 nm is 0.489 and the absorbance at 280 nm is 0.485.  Is this sample of sufficient quality for use in subsequent analysis?  To receive credit, you must show your calculation and concisely explain your assessment with regards to the extracted DNA’s purity.  

What is the melting temperature (Tm) of the following DNA sequence:   AGCTATGCCGGCTAGCAC

Which statement regarding sequencing is correct?