Aspirin is a weak acid as shown below that is taken up into the bloodstream by diffusion through cells lining the stomach and the small intestine. Aspirin crosses the plasma membrane of a cell most effectively in its uncharged (protonated) form; in its charged (deprotonated) form it cannot cross the […]

The upper edge of a gate in a dam runs along the water surface. The gate is 2.00 m high and 4.00 m wide and is hinged along a horizontal line through its center (Fig). Calculate the torque about the hinge arising from the force due to the water. (Hint: […]

Draw a hypothetical metabolic pathway composed of five substrates, five enzymes, and a product called Biological Sciazine. Number the substrates 1-5, and label the enzymes A-E, in order. (For instance, enzyme A catalyzes the reaction between substrates 1 and 2) a. Suppose a mutation made the gene for enzyme C […]

Gloria Green is the president of Avco Pharmaceuticals, Inc. She just received news that her stock had fallen $10 per share in the last hour. Gloria does not know that her competitor, John Steele, has started a rumor that she’s about to file for Chapter 11 bankruptcy. John has been […]