After his return to England, Darwin pondered which of the following questions most heavily?
a. What could explain the great numbers and variety of species?
b. Does the fossil evidence support uniformitarianism?
c. Are the extinct and living armadillos the same species?
d. Did Galápagos mockinbirds have a common mainland ancestor?
e. Will natural selection work in England?
A
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Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.
Propose a valid reason to explain why is it critical that the K+ channel activation gate responds slightly slower to depolarization than the Na+ channel activation gate.
A. If both gates showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes. B. If both gates showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials. C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist. D. The conformational change in one gate is necessary to trigger the activation of the other.
The ecological footprint of a person living in the United States is three times the global average. Name at least three things you could do to decrease the size of your personal ecological footprint
What will be an ideal response?
Allosteric inhibition generally results from
a. excess substrates. b. binding of regulatory molecules at sites other than the active sites. c. a change in the temperature of the system. d. a lack of coenzymes. e. changes in pH.