A newly described unicellular organism was isolated from a salt mine. This organism has no membranous organelles and its cell wall lacks peptidoglycan. Attempts to culture it in a medium with less than 25% salt were unsuccessful, but it was able to grow well on 25% salt supplemented agar. This organism would best be described as a ________ and is most likely in the domain ________.
A. halophile; Archaea.
B. thermophile; Bacteria.
C. halophile; Bacteria.
D. thermophile; Archaea.
E. thermophile; Eukarya.
Answer: A
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Slug-eating behavior in garter snakes of the Pacific Northwest that live in coastal forests is ____
a. a result of learned responses b. genetically determined c. an example of sexual dimorphism d. seen only when their usual rodent prey is scarce e. influenced by a gene called foraging
Which of the following statements is not true of protists?
A. Moisture is absolutely essential to their existence. B. They make up a substantial fraction of the marine plankton. C. They are not known to cause diseases of humans. D. Most are free-living.
The moraines left when glaciers retreat are characterized by
A. year-round ice. B. low nitrogen content and little organic matter. C. rich, fertile soil. D. high levels of nitrogen, phosphate and carbon.
The hypothesis that high pressure forces phloem sap to flow was tested and supported by studies using
a. caterpillars. b. radiolabeled hormones. c. vacuum chambers. d. aphids. e. radiolabeled sugars.