The discoverer of "homeotic mutations," who also resisted the growing "modern synthesis" model of evolution, was ________
A) St. George Mivart
B) Ernst Mayr
C) Julian Huxley
D) David Wake
E) William Bateson
E
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Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was transferred via simple transposition. B. The insertion sequence was a "cut-and-paste" transposon. C. A mutation occurred during transposition of the insertion sequence. D. The insertion sequence was transferred via replicative transposition.
Several genetic disorders, including Fanconi anemia and ataxia telangiectasia, are caused by mutations in ____
a. the cell wall b. mitochondrial DNA c. ribosome structure d. DNA repair genes e. DNA polymerase genes
During the signal transduction process, the signal often triggers a signal transduction cascade. For example, an activated receptor activates hundreds of protein A. Each activated protein A activates hundreds of protein B and so on until a cellular response occurs. What purpose does this cascade serve?
a. Having several intermediates allows for greater control of the response. b. The cascade serves to amplify the signal, so one activated receptor can have a significant response. c. Having a cascade allows the cell to respond to different signals. d. The cascade makes signaling easier to shut off or terminate.
A research laboratory is attempting to collect the content of human red blood cells. The type of solution researchers should use to cause blood cells to lyse (burst) would be
A. osmotic. B. hypoosmotic. C. isosmotic. D. hyperosmotic.