Which of the following is NOT a terpene?
A. the insect repellent citronella
B. the anti-cancer agent taxol
C. rubber
D. polyvinyl
E. terpentine
D. polyvinyl
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The evolution of development of snout-length in cichlid fish is best explained by
A. a single gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
A woman comes to your genetic counseling center because she knows that Huntington disease occurs in members of her family. Her paternal grandfather was afflicted, but so far her father shows no symptoms. Her two great-great grandmothers on her father's side were healthy well into their 90s, and one of her great-great grandfathers died of unknown causes at 45. Testing for Huntington disease is
extremely expensive, but she is concerned that she may fall victim to this disease and wants to plan her life accordingly. After examining her pedigree you advise her to A. not get tested because there is no possibility that she is homozygous. B. not get tested because only males in her family get the disease. C. get tested because her father could be a carrier. D. not get tested because her father is only a carrier and it is very unlikely her mother is a carrier. E. not get tested because her 40-year-old father shows no symptoms.
What action results when activators present near a gene are "turned on"?
A) increased transcription B) decreased gene expression C) unwinding of the DNA double helix D) a shift in the reading frame
Which of these is normally found in the glomerular filtrate?
A) Na+ B) Fat droplets C) Erythrocytes D) White blood cells E) Large proteins