Futuyma and colleagues (1995 ) demonstrated that host shifts by the herbivorous leaf beetles of the genus Ophraella in feeding on members of the sunflower family are due to the ________
A) frequency-dependent selection properties among beetle populations
B) low mutation rate observed in beetle populations
C) need for populations to maintain sufficiently large sizes on a small number of hosts
D) availability of genetic variation sufficient for evolutionary change
D
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When there is no arabinose available in the environment, the AraC protein acts as a(n) ________ for the E. coli ara operon.
Fill in the blank(s) with the appropriate word(s).
Which muscles may contract during inspiration?
(a) external intercostals. (b) internal intercostals. (c) abdominal. (d) both b and c.
Which two animals listed below do NOT contain an actual circulatory system?
a. grasshopper and fish b. grasshopper and hydra c. hydra and fish d. sponge and fish e. sponge and hydra
A function of which initiation factor is to prevent premature joining of the large and small ribosomal subunits?
A. eIF1A in eukaryotes and IF-1 in bacteria B. eIF2 in eukaryotes and IF-2 in bacteria C. eIF5 in eukaryotes and IF-3 in bacteria D. eIF3 in eukaryotes and IF-3 in bacteria