Which of the following traits appeared at point 4 on the the phylogeny above?
A. bulk transport
B. gap junctions
C. cell signaling
D. adhesion
E. differentiation of distinct cell types
A
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Tetrodotoxin is a potent poison, produced by some newts, pufferfish, and blue-ringed octopus that affects sodium transport involved with the voltage gates in neurons. A friend swimming in the Caribbean is pricked by a pufferfish and gets very sick. The most likely action the poison takes is
A. Mimicking a symporter and allowing sodium to rush out and potassium to rush in. B. Mimicking an antiporter and allowing sodium to rush out. C. Blocking an antiporter so sodium cannot rush in. D. Blocking a symporter and keeping sodium from rushing in.
You are a biologist on a trip to an island in the South Pacific. While there, you are allowed to collect DNA samples from a local species of tortoise that resembles a species seen on a nearby continent
If your DNA analysis also indicates the two species are highly related, you might conclude that this was an example of _______________ through ________. A. allopatric speciation; dispersal B. allopatric speciation; vicariance C. sympatric speciation; dispersal D. sympatric speciation; vicariance
Which groups of archaea are adapted to living in highly salty environments? a. Extreme thermophiles b. All of these choices
c. Methanogens d. None of these choices. e. Extreme halophiles
In the final trimester of pregnancy, your test results came back positive for an infection that would likely be damaging for the newborn, so your doctor wants to prescribe an antibiotic. Â What organism is the likely culprit here?
A. Leptospira B. Trichomonas C. Group BÂ Streptococcus D. Herpes simplex 2