The neurotoxin that Taricha spp. possess to ward off predators is
A) TTG.
B) taricha venom.
C) tetrodotoxin.
D) thamnophis poison.
C
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Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:
A. allopatric speciation by dispersal. B. allopatric speciation by vicariance. C. peripatric speciation by vicariance. D. sympatric speciation by dispersal. E. sympatric speciation by vicariance.
Charlotte liked to have a suntan all of the time, so she never wore sunscreen at the beach or in the tanning salon. During a visit to her doctor, she was told that she has the most common form of skin cancer
She will be all right, but she should avoid prolonged exposure to UV radiation in the future. Which skin cancer does she have? A) melanoma B) squamous cell carcinoma C) sebaceous carcinoma D) basal cell carcinoma
FtsZ, MreB, and CreS proteins regulate the shape and structure of bacterial (prokaryote) cells. These proteins are homologous to the ________ in eukaryotes.
A. cytoskeleton B. DNA processing enzymes C. cell wall D. organelles
To translate the three enzymes of the lac operon, ________ mRNA molecule(s) is/are transcribed
A) 3 B) 0 C) 1 D) 4 E) 2