Why is nonhomologous end joining (NHEJ) more frequent in eukaryotes?
A. Bacteria replicate frequently and so can use recombination repair to repair most double-strand breaks.
B. The period of time between DNA synthesis events is longer so double-strand breaks occurring outside of the period require NHEJ.
C. NHEJ is a mutagenic process that is tolerated better in larger genomes.
D. Some eukaryotic cell types use NHEJ as a source of gene variation.
E. All of the choices given are correct.
E
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Ruminant animals have symbiotic fungi which
A. digest cellulose and lignin. B. infect milk-producing glands, fermenting the milk. C. produce toxins in muscle tissue. D. produce natural antibiotics.
Most bony fishes have a hard plate that covers the gills on each side of the head called the
A. radula. B. pharyngeal slits. C. lateral lines. D. operculum. E. gill arches.
When two or more separate mutlicellular algae stages occur in succession during the life cycle, we call this:
a. gametangia. b. fragmentation. c. sporangium. d. alternation of generations.
In the human systemic circuit, blood will pass through all but which of the following?
a. liver b. limbs c. lungs d. digestive organs e. brain