Why is acetogenesis from H2 and CO2 more favored than methanogenesis in termites?
a. Unlike methanogens, acetogens are able to use other substrates, such as sugars, as electron donors for energy metabolism.
b. Unlike acetogens, methanogens are able to use other substrates, such as methyl groups, as electron donors for energy metabolism.
c. Termite acetogens can better colonize the H2-rich termite gut center, whereas methanogens are restrictedto the wall.
d. both a and c
Answer: D
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With few exceptions, we can't use observable traits to measure genetic variation in populations because:
A. observable traits don't vary enough among individuals to measure. B. we can't identify enough observable traits to be useful, even if they could be measured. C. many traits are encoded by large numbers of genes. D. observable traits are products of the environment as well as the genome. E. Many traits are encoded by large numbers of genes, and observable traits are products of the environment as well as the genome.
Brittle stars are members of the class ____ of the phylum Echinodermata
a. Asteroidea b. Ophiuroidea c. Echinoidea d. Holothuroidea e. Crinoidea.
Which of the following is a sterol-like lipid associated with plant cell membranes?
A) stearate B) phytosterol C) linoleate D) palmitate E) hopanoids
What is the greatest know mass extinction to date?
a. K–T mass extinction c. Triassic mass extinction b. Permian mass extinction d. Devonian mass extinction