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

Biology & Microbiology

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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

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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 +

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The body of a cnidarian is supported by a(n) hydrostatic skeleton

____________________ Indicate whether the statement is true or false.

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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)

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