Which is the correct series of events in the evolution of life on Earth?
A) O2 ? aerobic metabolism ? photosynthesis B) Photosynthesis ? O2 ? aerobic metabolism
C) Aerobic metabolism ? photosynthesis ? O2 D) O2 ? photosynthesis ? aerobic metabolism
B
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Humic acids are difficult to degrade, and therefore they usually remain in a system for several decades
Indicate whether the statement is true or false.
Dosage refers to the number of copies of each gene in a chromosome
A. true B. false
The internal temperature of mammals is maintained within a narrow range; to do so, mammals must have _____.
A) receptors sensitive to temperature B) cells that absorb excess heat C) circulating chemicals in the blood that tell cells when to absorb or release heat D) molecules that are activated by changes in temperature E) all of the choices
In viruses, genetic information flows from ________ to ________
A) RNA / virion B) nucleic acid / protein C) capsid / virion D) DNA / protein