In the presence of water, nonpolar associations form between molecules or regions of molecules that
are ____.
a. partially charged
b. hydrophobic and hydrophilic
c. hydrophobic
d. fully charged
e. hydrophilic
C
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Weight loss dieting in humans has been shown to ____
a. increase absolute numbers of Firmicutes bacteria b. decrease absolute numbers of Firmicutes bacteria c. increase the abundance of Firmicutes bacteria relative to Bacteroidetes bacteria d. decrease the relative abundance of Firmicutes bacteria relative to Bacteroidetes bacteria e. not affect bacterial populations in human intestines
Sea urchins are mostly carnivores
Indicate whether the statement is true or false
Sodium, potassium, and calcium are referred to as
a. electrolytes. b. nonelectrolytes. c. acids. d. bases. e. proteins.
Small circular molecules of DNA in bacteria ____.
A. are plasmids B. are DNA fragments from their main chromosome C. result from the activity of restriction enzymes D. are eventually degraded E. cannot survive outside of the cell