Summary

This document contains a biology quiz focused on lipids, specifically their roles in cellular membranes. The questions cover various aspects of membrane structure and function, including roles of proteins and integration. It tests understanding of basic principles in cell biology.

Full Transcript

**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.

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