Rings of the protein _______ in the pericentriolar material nucleate microtubule assembly
a. centrin
b. pericentrin
c. alpha-tubulin
d. gamma-tubulin
e. beta-tubulin
Ans: d. gamma-tubulin
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What organisms are important nitrogen fixers in aquatic ecosystems?
A. diatoms B. cyanobacteria C. algae D. rhizobial fungi E. symbiotic coral animals
Chitinases are examples of
a. systemins. b. phytoalexins. c. PR proteins. d. R genes. e. heat-shock proteins.
Which structure is a rod of stiffened support
tissue? a. A b. B c. C d. A and B e. none of these
Epidemiologists classify diseases by their mortality rate (the percent of infected individuals who die from the disease) and by their communicability (how easy it is to transmit the disease). Which of the following diseases of the cardiovascular system is mismatched with a description of its properties?
A. Plague; somewhat high mortality rate and low communicability B. Ebola; high mortality rate and high communicability C. Malaria; low mortality rate and high communicability D. AIDS; high mortality rate and low communicability