Lipids.docx

**1. Which of the following molecules is not a primary molecular component of cellular membranes?** **Student Answer/ Correct Answer: **Nucleic Acids **2. Membranes are structures that enclose cells and other cellular compartments. Which of the following most correctly summarizes their structure.*...

**1. Which of the following molecules is not a primary molecular component of cellular membranes?** **Student Answer/ Correct Answer: **Nucleic Acids **2. Membranes are structures that enclose cells and other cellular compartments. Which of the following most correctly summarizes their structure.** **Student Answer/ Correct Answer: **Membranes are dynamic, flexible structures. **3. Which of these incorrectly summarizes the function of cellular membranes?** **Student Answer/ Correct Answer: **The membrane is permeable, allowing biological molecules to pass through easily. **4. When compared to the tails of saturated phospholipids, unsaturated phospholipid tails:** **Student Answer/ Correct Answer: **have more double bonds **5. Which of the following does not contribute to membrane fluidity?** **Student Answer/ Correct Answer: **Nucleic Acids embedded in the membrane **6. At warmer temperatures, when compared to cooler temperatures, membranes:** **Student Answer/ Correct Answer: **become more fluid **7. Which of the following makes up the majority of a membrane?** **Student Answer/ Correct Answer: **Lipids **8. Which of the following is true about the plasma membrane?** **Student Answer/ Correct Answer: **Plasma membranes define the cell\'s border and provide fluidity for optimal function. **9. Which of the following is an example of a protein that is completely integrated into the plasma membrane?** **Student Answer/ Correct Answer: **Integrins **10. Charged ions like potassium (K+) and sodium (Na+):** **Student Answer/ Correct Answer: **cross the membrane by moving through specific channels. **11. Under normal conditions, sodium ions (Na+):** **Student Answer/ Correct Answer: **are more concentrated outside the cell. **12. Which of the following summarizes how the electrochemical gradient is maintained within cells?** **Student Answer/ Correct Answer: **The cell uses energy to pump ions across the membrane and against the electrochemical gradient.