Repair of an apurinic or apyrimidinic site in DNA by AP endonuclease must be completed by the action of ________.
A. RecA protein
B. UvrABC endonuclease
C. DNA polymerase I
D. None of the choices are correct.
Answer: C
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Plasmid cloning vectors generally contain genes for which two traits?
a. lacZ production and ampicillin resistance b. ?-galactosidase enzyme production and ampicillin resistance c. DNA ligase production and sticky ends d. DNA ligase and reverse transcriptase production e. DNA polymerase production and antibiotic resistance
Because of its negative charge, there is more _______ in a cell than in the extracellular fluid.
a. potassium (K – ) b. chlorine (Cl – ) c. sodium (Na + ) d. potassium (K +
The body of a cnidarian is supported by a(n) hydrostatic skeleton
____________________ Indicate whether the statement is true or false.
For most T4 phages, the nucleic acid enters the host cell but the capsid is left outside.
Answer the following statement true (T) or false (F)