BIOL 253 Exam 1 Questions & Answers | 100% Correct Answers | Verified | Latest 2024 Version

Which of the following transport mechanisms may be utilized to move glucose across cell membranes? - Secondary active transport and facilitated diffusion Which of the following statements about the Na-K pump is(are) true? - The location of the binding sites on the Na-K pump dictates the direction of solute movement. Examples of active transport may include __________. - the movement of Na+ ions out of cells and the movement of glucose molecules into intestinal epithelial cells Which of the following statements about epithelial transport in the intestines is (are) true? - The Na+/K+ ATPase is found only in the basolateral membrane of intestinal epithelial cells and the movement of Na+ ions across the apical membrane of intestinal epithelial cells is dependent on the electrochemical gradient created by the Na+/K+ ATPase. Which of the following statements is false with regard to primary/secondary active transport? - Substances will always move down their concentration gradient. If a cell were to become depleted of its ATP, which type of membrane transport would be most directly and immediately affected? - Primary active transport Energy released by the hydrolysis of ATP is used to move K+ and Na+ across cell membranes. This process is called __________. - primary active transport Substances that are going to move against their concentration gradient (from low concentration to high concentration) will use which type(s) of membrane transport? - Primary or secondary active transportIn skeletal muscle, the sarcoplasmic reticulum stores a very high concentration of Ca++. When Ca++ is released into the cytosol of muscle to facilitate contraction, it needs to be removed and pumped back into the sarcoplasmic reticulum so that skeletal muscle can return to its relaxed state. The Ca++ is moved from cytosol and pumped back into the sarcoplasmic reticulum where its concentration is much higher. What type of membrane transport does this represent? - Primary active transport What is similar between facilitated diffusion and primary/secondary active transport? In both forms of transport __________. - a membrane transport prote