To function as a repressor-binding site, the iron response element (IRE) must be in the first 70 nucleotides of the ferritin mRNA. This suggests that protein binding to this IRE
a. regulates message degradation.
b. interferes with the 5? cap binding to the ribosome.
c. blocks the translation start site.
d. inhibits the binding of EF-Tu.
Ans: b. interferes with the 5? cap binding to the ribosome.
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A bell-shaped curve of phenotypic variation is
indicative of a. incomplete dominance. b. continuous variation. c. multiple alleles. d. epistasis. e. environmental variables on phenotypes.
What is the first step in investigating any ecological question?
a) make observations b) make a computer model c) conduct and experiment d) come to a conclusion
Dandelions in a lawn that is mowed have short flower stalks, whereas those in a field have tall flower stocks. This illustrates
A) convergent evolution. B) natural selection. C) artificial mutation. D) artificial selection. E) inheritance of acquired characteristics.
In humans, widow's peak (W) is dominant over straight hairline (w). If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?
a) can't be determined b) 25% c) 0% d) 100% e) 50%