Darwin's book in which he described his views on evolution is:
A. Principles of Geology.
B. Survival of the Fittest.
C. On the Origin of Species.
D. On the Principle of Population.
C
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The term ________ refers to the degree or intensity of pathogenicity.
Fill in the blank(s) with the appropriate word(s).
Predict the expected consequence(s) of applying a toxin that blocks voltage-gated Ca2+ channels in 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.
If the codon is AAA, what is the complementary anticodon?
A. TTT B. AAA C. CCC D. UUU
The oldest known megafossils of early vascular plants may be characterized as:
a. possessing dichotomously branched stems with leaves. b. possessing dichotomously branched stems without leaves or roots. c. possessing erect stems with megaphylls. d. possessing roots but lacking sporangia. e. lacking roots but possessing megaphylls.