The HIV genome is especially prone to mutation because
A. it is made of DNA.
B. it is an emerging virus.
C. it is copied by reverse transcriptase, which lacks a proofreading function
D. of the many different drugs HIV patients must take.
C
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Water molecules are polar with ends that exhibit partial positive and negative charges. These opposite charges allow water molecules to attract each other through:
A. ionic bonds. B. covalent bonds. C. hydrogen bonds. D. peptide bonds.
The typical movement of xylem sap from roots to shoot parts is best described as
a. facilitated diffusion. b. symport. c. guttation. d. osmosis. e. bulk flow.
Which class of neurons takes nerve signals to the central nervous system?
A. sensory B. interneuron C. motor
Compare and contrast the formation, properties, and characteristics of covalent and ionic bonds. What will be an ideal response?