The main benefit to a plant from a mycorrhizal association is ____
a. enhanced water uptake
b. removal of excess carbohydrates
c. enhanced flow of carbohydrates to the roots
d. enhanced mineral ion uptake
e. enhanced protection of roots from bacterial infections
ANSWER: d
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Which part of the neuron is responsible for basic cellular maintenance functions?
A. axon B. dendrite C. soma D. myelin sheath E. axon hillock
Two species of spiny anteaters (echidnas) and the duck-billed platypus are the only known living members of which of the following mammalian lineages?
a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials
An animal breeder asks your advice about which of a number of traits could most effectively be selected for in his herd. Which would you most correctly suggest?
A) a trait with high VE B) a high VA relative to VP C) a high VP relative to VG D) a low h2 value E) a low selection coefficient
Rickettsiosis is caused by Rickettsia rickettsii, a pathogen that
A) produces powerful exotoxins. B) provokes a severe immune response. C) interferes with the host cell's Krebs cycle. D) infects the lining of blood vessels and leads to leaking of plasma into tissue. E) lyses the host's cells.