Which of the following is a function of the membrane proteins called channel proteins?
A) They bind to specific extracellular molecules to trigger a cellular change.
B) They permit the passage of ions, bypassing the lipid portion of the cell membrane.
C) They are enzymes.
D) They serve as anchors or stabilizers for the cell membrane.
E) They are used as a source of energy.
B) They permit the passage of ions, bypassing the lipid portion of the cell membrane.
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How many grams of glucose, m.w. 180 daltons, is necessary to make 1 liter of a 1.0 molar solution?
A) 360 B) 180 C) 90 D) 6.02 × 10 23 E) 1.0
If a stimulus created a membrane potential of -40 mV during the absolute refractory period, which of the following would occur?
A. A second action potential begins B. A seres of action potentials occur C. The action potentials end normally D. Sodium inactivation gates open
This figure shows a cross section of the spinal cord. What structure does number 4 indicate?
A. Posterior median sulcus B. White commissure C. Lateral funiculus D. Anterior median fissure E. Anterior funiculus
Sarcoplasm is
A. the cytoplasm of a muscle fiber. B. smooth endoplasmic reticulum that stores calcium. C. tubules that surround myofibrils. D. the plasma membrane of a muscle fiber.