The primary habitat for Vibrio spp. is:
a. freshwater.
b. the upper respiratory tract of various mammals.
c. brackish or marine water.
d. the soil and water environment.
C
The epidemiologic patterns of Vibrio spp., Aeromonas spp., P. shigelloides, and C. violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and freshwater for Aeromonas spp., P. shigelloides, and C. violaceum. None of these organisms are considered part of the normal human flora.
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Which of the following steps in prokaryotic binary fission is INCORRECT?
A. DNA is replicated bidirectionally from a single point on the circular chromosome. B. The two replicated chromosomes remain attached to the plasma membrane. C. The cell continues to grow outward symmetrically, separating the two chromosomes. D. Cell wall material is laid down at the midpoint to separate the two daughter cells. E. Construction of the plasma membrane and cell wall separates the two daughter cells.
The neuron that secretes neurotransmitters into the synapse is called the _________, and the neuron that receives the signal is called the ________.
A. presynaptic neuron; postsynaptic neuron B. preneurotransmitter; postneurotransmitter C. postneurotransmitter; preneurotransmitter D. postsynaptic neuron; presynaptic neuron
Crossover suppression implies that __________
A) there are no crossovers between homologous chromosomes B) recombinant chromosomes are absent in the progeny C) small inversions have a high frequency of crossover D) nonreciprocal translocations prevent equal exchange of chromosomes, resulting in loss of chromosome fragments E) Both A and C are correct
IA and IB alleles exhibit ________ (complete or incomplete) dominance over the i allele
Fill in the blank(s) with correct word