Refer to the paragraph on dark-eyed junco birds. The UCSD campus male junco population tails are about 36% white, whereas the tails of males from nearby mountain populations are about 40-45% white
The founding stock of UCSD birds was likely from the nearby mountain populations because some of those birds overwinter on the UCSD campus each year. Population sizes on the UCSD campus have been reasonably large, and there are significant habitat differences between the UCSD campus and the mountain coniferous forests; UCSD campus has a more open environment (making birds more visible) and a lower junco density (decreasing intraspecific competition) than that in the mountain forests. Given this information, which of the following evolutionary mechanisms do you think is most likely responsible for the difference between the UCSD and mountain populations? A) natural selection
B) genetic drift
C) gene flow
D) mutation
A
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Which of the following statements about the mRNA start codon is INCORRECT?
A. The start codon is only a few nucleotides from the ribosomal binding site. B. The start codon is usually GGA. C. The start codon is usually AUG. D. The start codon specifies the amino acid, methionine. E. The start codon defines the reading frame.
A free nucleotide has a five carbon sugar (deoxyribose), __________ phosphate groups, and one of
four nitrogen-containing bases. Fill in the blank(s) with the appropriate word(s).
Which of the following statements is TRUE?
A) Heroin binds to endorphin receptors. B) Caffeine increases the effects of neurotransmitters that normally suppress nerve signals. C) Alcohol is a stimulant. D) Nicotine is a depressant.
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.