Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the
A. allosteric site, and its effectiveness is not influenced by substrate concentration.
B. allosteric site, and its effectiveness depends on substrate concentration.
C. active site, and its effectiveness is not influenced by substrate concentration.
D. active site, and its effectiveness depends on substrate concentration.
E. substrate, and its effectiveness depends on product concentration.
A
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The vocal folds are found in the ____________________, which is found at the top of the ____________________, or windpipe
Fill in the blank(s) with correct word
The bacterium that causes tetanus produces a toxin that affects the central nervous system and skeletal muscles, producing powerful tetanic contractions of the skeletal muscles. The toxin probably acts by
A) Increasing the amount of acetylcholinesterase in the synapse. B) Making the cells less permeable to sodium ions. C) Increasing the amount of potassium ion in the intercellular fluid. D) Making the cell membranes more permeable to calcium ion. E) Competing with acetylcholine for receptors at the motor end plate.
Which part of a lung lies on the diaphragm?
A. Mediastinal surface B. Apex C. Costal surface D. Base E. Hilum
The acromion is an anatomical feature of the __________.
A. clavicle B. scapula C. ulna D. scaphoid E. pollex