Compare precise and imprecise excision of transposons
What will be an ideal response?
Ans: Either of these may occur when homologous recombination between a pair of repeated transposons takes place. Precise excision occurs when this recombination removes both a transposon and one copy of the duplicated target sequence from the original target site, resulting in a true reversion mutation. Imprecise excision, which is much more common, occurs when recombination leaves a portion of the transposon in the target site.
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One finding of the Human Genome Project was that mutations in _____ can cause mutations in distant regions of the
genome, which can result in cancer. a. DNA repair genes b. promoter regions c. introns d. SNPs e. open reading frames
Forests along rivers in the Pacific Northwest that have lost their salmon populations are less productive because the
A) pollution that killed the fish has also directly affected the trees. B) global warming that wiped out the fish has also harmed the trees. C) dams that prevented the fish from migrating also flooded the forests. D) nitrogen the fish brought from the ocean and contained in their tissues has been lost. E) fishers who overharvested the salmon compacted the soil in the process.
How would paralysis of the intercostal muscles alter inspiration?
a. Inspiration could not take place. b. Inspiration rates would increase due to the relaxation of the intercostal muscles. c. Inspiration could still take place but lung volume could not reach normal inspiratory volume. d. Pleurisy would cause inflammation, resulting in pain and reduced volume.
All of the following support the idea that RNA may have been the first genetic material EXCEPT?
A. There are viruses that use RNA as genetic material. B. RNA is a simpler molecule than DNA. C. RNA does not mutate. D. RNA has been shown to be able to make copies of itself.