Over 470,000 cases of cholera were reported in Haiti in the two years following the 2010 earthquake. Which of the following was the most likely mode of transmission?
A. mosquitoes
B. aerosols
C. contact
D. contaminated water
E. contaminated milk
Answer: D
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Insulin-like growth factor I is produced in response to
A. growth hormone. B. cortisol. C. prolactin. D. adrenocorticotropic-releasing hormone. E. thyroid hormone.
A gene is
A) a stretch of DNA coding for a polypeptide chain (sequence of amino acids). B) a microscopic, threadlike body within a cell. C) any heritable behavioral, morphological, or physiological trait of an organism. D) all of the DNA in a cell.
You wish to create a mutation in which you prevent access of RNA polymerase to the gene. Which region of a gene would you target?
A) coding region B) start codon C) promoter sequence D) terminator sequence E) stop codon
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle)
Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four-chambered hearts of birds and mammals are best described as _____. A) structural homologies B) vestiges C) homoplasies D) the result of shared ancestry