LSU BIO 1201 EXAM 2 ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS

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LSU BIO 1201 EXAM 2 ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS why are membranes called phospholipid bilayers? - Answer -phospholipids have hydrophilic head and hydrophobic tail, hydrophobic face inside of cell making 2 layers what is meant by fluid mosaic? - Answer -Mosaic of proteins drifting laterally in fluid bilayer of phospholipids how are membranes adjusted for different temperatures? - Answer -membrane fluidity adjusted by changing the ratio of unsaturated to saturated fatty acids how do the relative amounts of saturated and unsaturated fats change? - Answer -if you are in a cold environment you want more saturated fats for your membranes to be fluid; warm environment you want more saturated fats to make your membranes more solid what is meant by membrane fluidity? - Answer -not too solid, not too fluid why is fluidity an important property? - Answer -preserves membrane function Henrique and Hanson performed experiments with pigs and examined the effects on the relative amounts of saturated and unsaturated fats. What did they find? - Answer -found that membrane fluidity can acclimate to temperature; pigs raised wearing underwear in a hot room had subcutaneous fats with higher melting point what types of molecules can move easily across the membrane? - Answer -small nonpolar molecules, gases, steroid hormones, and 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 water what is simple diffusion? - Answer -down the concentration gradient; does not require supplied energy; does not use a carrier molecule what is facilitated diffusion? - Answer -down the concentration gradient; employs carrier molecule; does not require supplied energy what is active transport? - Answer -work must me done; must use supplied energy; employs carrier molecule for which transport processes are carrier molecules involved? - Answer -facilitated diffusion and active transport which transport processes require the input of additional energy? - Answer -active transport what is a semi-permeable barrier? - Answer -only some types of molecules pass through when equilibrium is reached in diffusion: does movement of molecules stop? - Answer -no when equilibrium is reached in diffusion: does the net movement of molecules stop? - Answer -yes what is meant by hypertonic? - Answer -lower water potential; more solutes dissolved; tend to gain water via osmosis what is meant by hypertonic? - Answer -higher water potential; fewer solutes dissolved; will tend to lose water via osmosis 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