One biological example of a positive feedback system is
A) blood pH levels. B) water balance.
C) temperature regulation. D) mammalian birth.
D
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An experimental test of the hypothesis to explain the origin of the first organic compounds on Earth might include all of the following sequential steps except
A. assembling an atmosphere with H2, CH4, NH3, and H2S. B. placing this atmosphere over liquid water. C. inoculating with a few bacteria to get the process started. D. increasing the temperature of the gases. E. providing energy with electrical spark discharges.
Mitochondrial Eve was
A) fossil evidence of the Biblical Eve. B) a figurative first woman who had a mtDNA sequence that could have given rise, by mutation, to all modern human mtDNA. C) a hominid who had features of both australopithecines and Homo. D) a famous female paleontologist who has studied several fossil hominids in Ethiopia.
All mammals ________.
A. are ectothermic B. have mammary glands and hair C. are nocturnal D. give birth to live young
What is released at each step of an electron transport chain?
A. ultraviolet wavelengths B. electrons C. photons D. energy E. All answers are correct.