BIO 1201 - GREGG- EXAM 2 PRACTICE ACTUAL 2025/2026 WITH VERIFIED ANSWERS

Content Preview

BIO 1201 - GREGG- EXAM 2 PRACTICE ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS Which component in the accompanying figure plays a critical role in cell-cell recognition? A) A B) B C) C D) E - Answer -B) B Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature? A) Since the cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium, the membrane must be asymmetrical. B) Since cell membranes communicate signals from one organism to another, the cell membranes must be asymmetrical. C) The two sides of a cell membrane face different environments and carry out different functions. D) Proteins only function on the cytoplasmic side of the cell membrane, which results in the membrane's asymmetrical nature. - Answer -C) The two sides of a cell membrane face different environments and carry out different functions. Which of the following statements is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures? A) The double bonds form kinks in the fatty acid tails, preventing Need assistance on Online classes, Exams & Assignments? Reach out for instant help!! Full Course Assistance, Plagiarism-free Essay Writing, Research Paper, Dissertation, Discussion Posts, etc…. Confidential & Secure services. Tutors are available for all subjects! Email now at: tutorjean01@gmail.com adjacent lipids from packing tightly. B) Unsaturated fatty acids have a higher cholesterol content, which prevents adjacent lipids from packing tightly. C) Unsaturated fatty acids are more nonpolar than saturated fatty acids. D) The double bonds block interaction among the hydrophilic head groups of the lipids. - Answer -A) The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly. What kinds of molecules pass through a cell membrane most easily? A) large and hydrophobic B) small and hydrophobic C) large polar D) small and ionic - Answer -B) small and hydrophobic Which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly? A) sucrose B) an amino acid C) O2 D) Na+ - Answer -C) O2 Celery stalks that are immersed in fresh water for several hours become stiff. Similar stalks left in a 0.15 M salt solution become limp. From this we can deduce that the fresh water ________. A) and the salt solution are both hypertonic to the cells of the celery stalks B) is hypotonic and the salt solution is hypertonic to the cells of the celery stalks C) is hypertonic and the salt solution is hypotonic to the cells of the celery stalks D) is isotonic and the salt solution is hypertonic to the cells of the celery stalks - Answer -C) is hypertonic and the salt solution is hypotonic to the cells of the celery stalks Which of the following statements is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal? Need assistance on Online classes, Exams & Assignments? Reach out for instant help!! Full Course Assistance, Plagiarism-free Essay Writing, Research Paper, Dissertation, Discussion Posts, etc…. Confidential & Secure services. Tutors are available for all subjects! Email now at: tutorjean01@gmail.com