Phospholipids are important components of the plasma membrane. What does "D" represent on the diagram?
A. phosphorus
B. oxygen
C. nitrogen
D. polar (hydrophilic) region
E. nonpolar (hydrophobic) region
A
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The muscles that move the thigh that originate on the vertebral column are
A) medial rotators of the thigh. B) flexors of the thigh. C) iliopsoas group of the thigh. D) adductors of the thigh. E) abductors of the thigh
Maintaining a stable internal environment typically requires
A) negative feedback mechanisms. B) decreased atmospheric pressure. C) an unstable outside environment. D) positive feedback mechanisms.
Which of the following is the strongest bond?
A) ionic B) double covalent C) hydrogen D) single covalent
Explain the function of sodium-potassium ion pumps
A) They generate ATP for the cell during the electron transport chain when hydrogen ions move in a process known as chemiosmosis. B) The sodium-potassium ion pump binds acetylcholine across the synaptic cleft to generate an action potential at the sarcolemma. C) The sodium-potassium ion pump allows facilitated diffusion of potassium during the repolarization of a muscle cell. D) The sodium-potassium ion pump allows facilitated diffusion of sodium during the depolarization of a muscle cell. E) The sodium-potassium ion pump maintains the resting membrane potential of a cell by exporting three sodium ions out in exchange for two potassium ions entering the cell.