In an open circulatory system, the circulatory fluid is called:
a. blood
b. plasma
c. interstitial fluid
d. lymph
e. hemolymph
e
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Our ability to respond to moderate heat and cold is due to
A. mechanoreceptors. B. thermoreceptors. C. nociceptors. D. electromagnetic receptors. E. chemoreceptors.
Which of the following organisms has the largest number of protein-coding genes?
a. E. coli (bacteria) b. Saccharomyces cerevisiae (yeast) c. Homo sapiens (human) d. Oryza sativa (rice) e. Drosophila melanogaster (fruit fly)
A DNA sequence that signals the start of a gene is
A. a codon. B. an anticodon. C. a terminator. D. a promoter. E. an amino acid attachment site.
In ________ selection, individuals intermediate in a phenotypic distribution have greater reproductive success.
A. balancing B. negative frequency-dependent C. directional D. stabilizing E. disruptive