During your dissection of a fish, what structure would you have to remove to see the gills?
A. spiracle
B. glottis
C. operculum
D. trachea
E. jaw bone
C. operculum
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Twenty-five years ago, when Oshima and colleagues discovered that a mutation in the GAL4 gene led to the inability to synthesize all five enzymes required for galactose catabolism (breakdown), they couldn't be blamed for wanting to apply a bacterial model
to explain this finding. What they expected, but did not find, was _____. A) that all five genes constitute an operon B) five widely separated genes, each containing a GAL4-binding site in its regulatory region C) that chromatin decondensation played an important role in regulating the genes of galactose catabolism D) that transcription is important in regulating the genes of galactose catabolism
Simple fruits are derived from ________
a. separate ovaries of one flower b. none of the choices c. fused ovaries of separate flowers d. one ovary
One line of evidence that humans arose in Africa is the observation that Africans have
A. the most diverse mitochondrial DNA sequences. B. rRNA sequences that place them in the domain Archaea. C. fewer genes. D. slower molecular clocks. E. the most diverse nuclear DNA sequences.
During the eugenics movement of the 1900s, it was believed that individuals affected with certain genetic disorders
should be sterilized to prevent transmitting the gene to future generations. Would such measures be effective? Why or why not? What will be an ideal response?