What is the main reservoir for Nitrogen?
a. Sedimentary rock
b. Plants
c. Soil bacteria
d. Feces
e. Atmosphere
e
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The genetic material (DNA) of eukaryotes is organized into
(a) centrioles. (b) spindles. (c) chromosomes. (d) microtubules.
George Beadle and Edward Tatum created a collection of mutants to study the following pathway
A mutant shows no growth on minimal media; however it shows growth if citrulline is provided. These results indicate the mutation would most likely be in the gene for: A. Enzyme I. B. Enzyme II. C. Enzyme III D. either Enzyme I or Enzyme II. E. either Enzyme II or Enzyme III.
A repair enzyme recognizes an incorrect structure in the DNA and directly converts it back to a correct structure. Which of the following DNA repair systems is responsible for the correction?
A. base excision repair B. direct repair C. indirect repair D. nucleotide excision repair E. methyl-directed mismatch repair
The nucleotide sequences on DNA that actually have information encoding a sequence of amino acids are
A. exons. B. introns. C. enhancers. D. proteins.