Selectively permeable membranes control the movements of molecules to pass through that are relatively small; large molecules such as proteins do not readily pass through a membrane but are transported by way of vesicle formation.
a. true
b. false
Ans: a. true
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What clotting protein, produced by the liver, begins the clotting process?
A) Fibrinogen B) Fibrin C) Prothrombin D) Thrombin
The enzyme-substrate complex is
A. another name for the active site. B. the reactants whose chemical reaction the enzyme catalyzes. C. the chemical structure formed when the substrate binds to the active site. D. a pocket on the substrate that the enzyme recognizes.
How are the components of fats absorbed in the small intestine?
A) Specific receptor proteins carry fatty acids across the intestinal wall and into the bloodstream. B) Fatty acids are transported by active transport to the bloodstream. C) Components of lipids diffuse through small intestinal cell membranes, are reconstructed in the cells, then carried off by lacteals as chylomicrons. D) Components of lipids diffuse through small intestinal cell membranes and into the bloodstream where they are carried to the liver for processing.
Dentists anesthetize a portion of the ________ nerve to stop pain impulses from the teeth.
A. hypoglossal B. facial C. trigeminal D. glossopharyngeal E. abducens