Which of the following is NOT a property of water?
A. The ability to facilitate chemical reactions
B. The ability to insulate the body from temperature extremes
C. The ability to dissolve nonpolar, hydrophobic molecules
D. The ability to cling to other water molecules, yet flow
Answer: C
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The electrostatic attraction between the slight positive charge of a hydrogen of one molecule and the slight negative charge of an oxygen, nitrogen, or fluorine of another molecule is called a(n)
A) nonpolar covalent bond. B) single covalent bond. C) polar covalent bond. D) ionic bond. E) hydrogen bond.
________ is motion that causes molecules in gases and liquids to bump into adjacent molecules
A) Diffusion B) Brownian movement C) Osmosis D) Concentration gradient
The middle ear communicates with the nasopharynx through the
A) auricle. B) membranous labyrinth. C) bony labyrinth. D) pharyngotympanic tube E) auditory meatus.
Which of these is a major difference between smooth muscle and skeletal muscle?
A. Myosin is the main regulatory protein in smooth muscle. B. Myosin is the main regulatory protein in skeletal muscle. C. Skeletal muscle usually exhibits spontaneous activity, while smooth muscle cannot contract spontaneously. D. Only skeletal muscle requires increased calcium ion concentration in the cytosol for contraction. E. Only skeletal muscle has both actin and myosin.