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BIOL 253 Exam 1 Questions and Complete Solutions Graded A+
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BIOL 253 Exam 1 Questions and Complete Solutions Graded A+
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BIOL 253 Exam 1 Questions and Complete SolutionsGraded A+
Denning [Date] [Course title] Which of the following transport mechanisms may be utilized to move glucose across cell membranes? - Correct Ans: Secondary active transport and facilitated diffusion
Which of the following statements about the Na-K pump is(are) true? - Correct Ans: The location of the binding sites on the Na-K pump dictates the direction of solute movement.
Examples of active transport may include __________. - Correct Ans: 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? - Correct Ans: 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? - Correct Ans: 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? - Correct Ans: Primary active transport
Energy released by the hydrolysis of ATP is used to move K+ and Na+ across cell membranes. This process is called __________. - Correct Ans: 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? - Correct Ans: Primary or secondary active
transport
In 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? - Correct Ans: Primary active transport
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