A warmed flask of water is analogous to the Miller-Urey experiment, which of the following is analogous to primordial Earth?
a. a strongly reducing atmosphere
b. lightning
c. a primeval sea
d. water vapour
Ans: c. a primeval sea
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Why are hydrocarbons insoluble in water?
A) The majority of their bonds are polar covalent carbon-to-hydrogen linkages. B) The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages. C) They are hydrophilic. D) They exhibit considerable molecular complexity and diversity. E) They are less dense than water.
How long did it take in the history of life on Earth to go from the first prokaryotic cells to the first eukaryotic cells?
A) 1,000 years B) 100,000 years C) 1 million years D) Over a billion years
What is the tendency of water molecules to stick together?
A) cohesion B) adhesion C) tension D) transpiration
In contrast to the cephalic and absorptive phases, the fasting phase is characterized by high blood levels of ________ and low levels of _______.
(a) glucagon; insulin (b) pepsin; insulin (c) insulin; glucagon (d) insulin; pepsin