Which microbial grouping is the major oxygenic phototroph in most salt lakes?
A) cyanobacteria
B) Dunaliella, a eukaryotic alga
C) halophilic Archaea
D) purple nonsulfur bacteria
Answer: B
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The genus Frankia
A. produces heat resistant endospores and is strictly a marine bacterium. B. produces heat-resistant endospores. C. grows in symbiotic association with the roots of some higher plants and fixes nitrogen. D. is strictly a marine bacterium.
Stomata close when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
The tocotransducer should be placed
a. Over the suprapubic area b. in the fundal area c. Over the area of the fetus' back d. Inside the uterus
The type of cells that are particularly effective at attacking body cells infected by viruses are
A. macrophages. B. natural killer cells. C. monocytes. D. eosinophils.