Exam 2: BIO1201/ BIO 1201 Review (Latest 2024/ 2025 Update) | Questions and Verified Answers| 100% Correct| Grade A – LSU

Exam 2: BIO1201/ BIO 1201 Review (Latest 2024/ 2025 Update) | Questions and Verified Answers| 100% Correct| Grade A – LSU Q: what is active transport? Answer: work must me done; must use supplied energy; employs carrier molecule Q: for which transport processes are carrier molecules involved? Answer: facilitated diffusion and active transport Q: which transport processes require the input of additional energy? Answer: active transport Q: what is a semi-permeable barrier? Answer: only some types of molecules pass through Q: when equilibrium is reached in diffusion: does movement of molecules stop? Answer: no Q: when equilibrium is reached in diffusion: does the net movement of molecules stop? Answer: yes Q: what is meant by hypertonic? Answer: lower water potential; more solutes dissolved; tend to gain water via osmosis Q: what is meant by hypertonic? Answer: higher water potential; fewer solutes dissolved; will tend to lose water via osmosis Q: isotonic Answer: equivalent water potential; equal number of solutes; no note movement of water Q: in which direction does water flow? Answer: osmosis and the direction of net water movement Q: what are aquaporins? Answer: channel proteins which facilitate water diffusion through the membrane Q: marine bony fish are...? Answer: hypotonic to seawater Q: how do enzymes work? Answer: they position the reactants in a conformation more favorable for the chemical reaction to occur Q: what aspects of the energetics do enzymes change? Answer: enzymes lower activation energy barrier ΔG⧧ Q: what aspects of energetics do enzymes not affect? Answer: they do not reverse an energetically unfavorable reactions; they do not make a reaction go uphill Q: how are substrates lured into the active site? Answer: positively charged arginine sidechain lures the negatively charged substrate into the active site