Tubeworms around deep-sea hot vents house which symbiotic organism?
a) photosynthetic daphnia
b) chemosynthetic bacteria
c) algae
d) sea lice
Ans: b) chemosynthetic bacteria
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Weight gain and obesity may be partly caused by certain gut microbial communities that
A) absorb more vitamins and essential amino acids. B) produce more volatile fatty acids by fermentation. C) stimulate the gut endothelium to absorb more sugars. D) produce more hydrogen gas by fermentation.
It is clear from current research on human behavior genetics that _____
a. animal models of human disease are not useful for behavior research b. epigenetics does not play a significant role in behavior disorders c. few abnormal behaviors have an environmental component d. most abnormal behaviors are due to single-gene effects e. abnormal behaviors are not due to single-gene effects
Which of these contains two haploid nuclei?
a) the heterokaryotic stage of the fungal life cycle b) zygote c) spore-producing structures d) mycelium e) hypha
Which of the following systems is NOT directly involved with regulation and maintenance of the body's chemistry?
A. the respiratory system B. the circulatory system C. the digestive system D. the reproductive system E. the urinary system