Which of the following is not part of the foregut?
A. small intestine
B. stomach
C. crop
D. mouth
E. esophagus
A
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Why might a point mutation in DNA make a difference in the level of a protein's activity?
A) It might result in a chromosomal translocation. B) It might exchange one stop codon for another stop codon. C) It might delay the rate of DNA replication. D) It might substitute a different amino acid in the active site. E) It might substitute the N-terminus of the polypeptide for the C-terminus.
Which of the following molecules would you predict moves through a lipid bilayer most rapidly?
A. C6H12O6 B. CH3OH C. C2H5OH D. C4H10 E. NH2SO2CH3
According to the Hardy-Weinberg principle, which of the following must be true for gene frequencies in a population to remain the same?
A) Mating is random. B) Mutations occur consistently. C) The population is small. D) Natural selection occurs.
The scientific name of the giant swallowtail is Heraclides cresphontes. Therefore,
A. it belongs to the genus Heraclides. B. the specific epithet is cresphontes. C. it belongs to the species cresphontes. D. All of the choices are correct.