Which type of bond holds the water droplets together as they are being pulled up the plant's vascular system?
a. Ionic
b. Double covalent
c. Covalent
d. Hydrogen
e. Polar covalent
d
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One reason angiosperms are more successful
than gymnosperms is because gymnosperms lack ___.
a. seeds b. megaspores c. fruits d. true leaves e. wood
Each tier of the biomass pyramid depicts the
____ of all the organisms in an ecosystem. a. size b. number of species c. dry weight d. total weight e. total utilization of materials
African sleeping sickness is caused by Trypanosoma brucei, a unicellular, flagellated protist that infects red blood cells after entering the bloodstream. Trypanosoma brucei is which of the following?
A. an alga B. a protozoan C. a slime mold D. a diatom E. a water mold
Mannose sugar occurs on the surface of some bacteria and fungi and can trigger the
A. release of cytotoxins by NK cells. B. release of histamines by basophils. C. classical pathway of complement activation. D. lectin pathway of complement activation. E. release of NETs by neutrophils.