Much of the work of breaking down the food we ingest is done by our
(a) stomach
(b) teeth
(c) gut microbiome
(d) esophagus
Ans: (c) gut microbiome
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Explain how neuron action potential propagation rate can be increased
What will be an ideal response?
Water has very special properties that not all chemicals share. Which of the following is not a property of water?
A) is nonpolar B) prevents wide temperature fluctuations C) requires a lot of energy to evaporate it D) interacts with lots of different substances
Why do florists and horticulturists often cut stems while they're holding a plant underwater?
A) to avoid transpiration B) to prevent dormancy C) to disrupt apical dominance D) to avoid formation of an embolism
Scientists have not yet determined conclusively whether DNA or RNA was the first nucleic acid that evolved on early Earth. Why does this topic interest scientists?
A) It interests scientists because RNA and DNA are the first organic molecules that existed; understanding them is the key to understanding how organic molecules first formed. B) Early cells could not store or pass information to future generations without nucleic acids. C) DNA and RNA are the inorganic precursors to all organic molecules formed on early Earth. D) Miller and Urey found evidence of DNA and RNA in the single amino acids formed in their experiment.