Two chambers are separated by a cation-permeable membrane. The first chamber contains 10 mM NaCl and 1 mM KCl, and the second chamber contains 10 mM KCl and 1 mM NaCl. At equilibrium, the membrane potential (with chamber 1 relative to chamber 2) is
a. greater than 0 mV.
b. equal to 0 mV.
c. less than 0 mV.
d. unable to be determined without knowing the temperature.
B
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As ATP binds to the myosin head at the beginning of a muscle contraction cycle, the myosin head immediately
A) initiates binding with actin. B) swivels. C) tightens its bond to actin. D) detaches from actin.
Lipoproteins that contain large amounts of cholesterol for transport to peripheral tissues are called ________.
Fill in the blank(s) with the appropriate word(s).
Skeletal muscles help maintain body temperature in that
A) excess myosin is quickly metabolized to yield heat. B) they conserve actin and myosin in cold weather. C) the more active they are, the more heat is released. D) the more active they are, the more heat is used up.
If you spin a tube of blood in a centrifuge, which component of the blood is the most abundant?
A. Platelets B. Red blood cells C. Plasma D. White blood cells