A) pest-resistant plants.
B) plants that are herbicide resistant.
C) plants with increased nutritional value.
D) All of the answer choices are correct.
E) None of the answer choices is correct.

A) are useful in identifying specific individuals.
B) are important sites in vectors where foreign DNA can be integrated.
C) are errors that can arise during DNA sequencing.
D) are DNA fragments generated during PCR.
E) are generally found in exons.

A) A vector may be a plasmid or bacteriophage.
B) A vector has a restriction enzyme recognition site.
C) A vector contains an RNA primer.
D) A vector contains an origin of replication.
E) A vector contains a selectable marker.