The photo below of Australian sawfly caterpillars is used as an example of:
1.Colonial living
2.Pheromone signaling
3.Social defensive behavior
4.Polygamous mating systems
3
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Which of the following would be true if a toxin that blocks voltage-gated Ca2+ channels was applied to a neuron?
A. No resting membrane potential would be observed (i.e., measures at 0 mV). B. A rapid increase in membrane potential at threshold voltage would not occur. C. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterwards. D. The neuron would become hyperpolarized. E. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
What will be an ideal response?
The number of the greater prairie chicken, a bird found in the prairies of Illinois, was drastically reduced during the 19th and 20th centuries due to hunting and habitat destruction. The number of the birds went from millions to fewer than 50. When the population rebounded to over 5,000, more than 30% of the alleles were lost forever. The allele loss in the above example is mostly due to__________________.
A. More information needed. B. Natural Selection C. Sexual Selection D. Genetic Drift
How is enrichment bias OFTEN reduced?
a. by diluting the inoculum b. by ensuring the medium is highly buffered c. by maintaining high oxygenation d. by using ecologically relevant light intensity