With enough time and in the absence of other evolutionary mechanisms, genetic drift will ________
A) reduce the genetic variation in a population
B) increase the genetic variation in a population
C) have no effect on the genetic variation of a population
D) None of the above.
A
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Synaptic vesicles discharge their contents by exocytosis at the
A. dendrite. B. axon hillock. C. nodes of Ranvier. D. postsynaptic membrane. E. presynaptic membrane.
The purine ______ always hydrogen bonds with the pyrimidine ________ in double-stranded DNA.
A. cytosine; guanine B. adenine; guanine C. thymine; guanine D. guanine; cytosine
Soil mineral particles that range from 0.02?0.002 mm in diameter are called
a. sand. b. humus. c. clay. d. silt. e. macro/microparticles.
Considering two species of birds, which of the
following is a derived character?
a. four limbs b. a bony skeleton c. egg production d. feathers e. two eyes