An orbital describes the ____ of an electron
a. exact location
b. exact path
c. most frequent locations
d. charge
e. chemical bonds
ANSWER: c
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If the genotypic frequencies for an allele in a population at Hardy-Weinberg equilibrium are 0.635 homozygous dominants, 0.430 heterozygotes, and 0.125 homozygous recessives, what is the frequency of the recessive allele?
A) 0.35 B) 0.65 C) 0.125 D) 0.875 E) 0.01
Many weeds have become resistant to the herbicides that were once used to control them. Which of the following statements best explains this observation?
A. Natural selection has acted on the genetic variability in the weeds’ genomes, enabling plants that have herbicide resistance to reproduce more successfully. B. The weeds have evolved to become different species. C. The herbicides have evolved and are no longer effective against the weeds. D. Continental drift has caused the evolution of weed resistance in the herbicides.
Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?
A) stimulating saltatory conduction B) stimulating depolarization of postsynaptic neurons C) inhibiting postsynaptic neurons from repolarizing D) inhibiting presynaptic neurons from depolarizing E) stimulating depolarization of presynaptic neurons
A maple tree's seeds occur in pairs that are enclosed and attached to flat "wings" that are made of a papery tissue. The wings' shape allows them to spin in the air as they fall from the tree; this unusual motion has earned them the nickname "helicopter
seeds." Maple tree seeds are most successful when they are dispersed by A) wind. B) water. C) mammals. D) birds.