Ionizing radiation can also cause damage to the nitrogenous bases of DNA. Repair of the damaged bases takes several steps. Which of the following repair mechanisms can be used to repair the nitrogenous bases of DNA damaged by ionizing radiation?

A. mismatch repair
B. nonhomologous end joining
C. excision repair
D. direct repair


Ans: C. excision repair

Biology & Microbiology

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The goal of tertiary wastewater treatment is to sharply reduce the levels of ________ from the final effluent

A) organic compounds B) heavy metals C) methane D) inorganic nutrients

Biology & Microbiology

Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI-gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain?

A. Transcription of the lac operon is repressed. B. Transcription of the lac operon does not change. C. The lac operon is constitutively expressed. D. Nonfunctional proteins are produced. E. The lac operon is constitutively expressed and nonfunctional proteins are produced.

Biology & Microbiology

Upon antigenic stimulation, CD8+ T cells differentiate into helper T cells

Indicate whether the statement is true or false.

Biology & Microbiology

The least inclusive of the taxonomic categories

listed here is a. family. b. phylum. c. class. d. order. e. genus

Biology & Microbiology