Prove the following statement by contradiction. If 3n+2 is odd, then n is odd. 

The restriction endonuclease HpaI cleaves the DNA of its recognition sequence GTTAAC to generate “blunt ends”.  Between which two bases of the recognition sequence would the DNA be cut to produce fragments with “blunt ends”? 

An incorrect statement about plasmid cloning vectors is which of the following?

Which is a characteristic of mRNA molecules but not tRNA or rRNA molecules?

Which of the following correctly describes the mode of action of restriction endonucleases in degrading DNA?

Nucleases are enzymes that hydrolyze nucleic acids. Most cells contain various nucleases, and digestive fluids contain large amounts to break down dietary nucleic acids. Because of the reaction they catalyze, nucleases are classified as:

The phosphate system buffers the intracellular fluid of cells at physiological pH. In this buffer system, excess alkalinity is neutralized by reacting with:

Plasmid cloning vectors are engineered to have cloning sites for foreign DNA fragments that consist of a series of cutting sites for different restriction endonucleases.  This allows DNA fragments that are generated by a variety of restriction endonucleases to be incorporated into the vectors.  These multiple arrays of restriction enzyme sites are called:

DNA gyrase is a bacterial enzyme that acts upon circular DNA molecules. An incorrect statement about DNA gyrase is:

In pure liquid water, the H2O molecules form a random, three-dimensional network in which hydrogen bonds are made and broken at a very high rate. The average lifetime of a hydrogen bond between two H2O molecules in liquid water is several: