In genetic engineering, the highly active plasmid from Agrobacterium tumefaciens is used to __________.

Gene cloning is crucial to any application involving one gene because __________.

Bacteria use restriction enzymes to __________.

Which of the following enzymes could seal a nick in one strand of a double-stranded DNA molecule by creating a sugar-phosphate bond between the adjacent, unjoined nucleotides?

The efficiency of cloning, and the ability to generate healthy cloned animals, has been largely hampered by the difficulty of __________.

A molecular biologist used a retroviral vector to introduce a gene coding for a certain human enzyme into mouse cells. One cell line was isolated that was able to make the human enzyme, but it had lost the ability to express an endogenous, normally expressed gene in the process. What is the best explanation for these results?

In DNA technology, the term vector can refer toa. the enzyme that cuts DNA into restriction fragments.b. the sticky end of a DNA fragment.c. a SNP marker.d. a plasmid used to transfer DNA into a living cell.

Which of the following is true of a codon? (A) It never codes for the same amino acid as another codon. (B) It can code for more than one amino acid. (C) It can be either in DNA or in RNA (D) It is the basic unit of protein structure

Which of the following would be considered a transgenic organism?a. a bacterium that has received genes via conjugationb. a human given a corrected human blood-clotting genec. a fern grown in cell culture from a single fern root celld. a rat with rabbit hemoglobin genes