Twins are concordant for a trait when ____
a. both twins share the trait with at least one parent
b. only identical twins have the trait
c. only fraternal twins have the trait
d. both twins have the trait
e. all of the twins’ siblings have the trait
d
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The relevance of the pseudocoelom to phylogeny has been questioned. Rotifera and Nematoda both have a pseudocoelom. The molecular evidence suggests which of the following conclusions?
A. Molecular evidence confirms that rotifers and nematodes are closely related and that both participate in the same monophyletic clade. B. Rotifers are more closely related to Lophotrochozoa than to nematodes. C. Rotifers are more closely related to echinoderms than to nematodes. D. Rotifers are more closely related to chordates than to nematodes. E. Rotifers are more closely related to nematodes than to mollusks.
Various viruses support their propagation by activating ____ kinase cascades in cells they infect
a. MAP d. GTP b. cAMP e. cytoplasmic c. steroid hormone
Pouches in the gut wall developed into ____ in
fishes that are ancestral to land vertebrates. a. heart chambers b. the notochord c. lobes of the liver d. lungs e. vocal cords
ATP contains ____ high-energy phosphate bonds.
A. one B. two C. three D. four