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psu Bio 230 exam 1 2025 Questions and Answers symptoms of cystic fibrosis - ....ANSWER☑️☑️...-persistent cough, thick mucus, difficulty breathing, sinus and lung infections, constipation, bad feces, infertility, malnutrition, hypoxia what tissue lining, digestive tract, and reproductive tract - ....ANSWER☑️☑️...epithelial cells, mucus membrane what causes the mucus buildup - ....ANSWER☑️☑️...-epithelial cells cannot transfer water successfully phospholipid bilayer - ....ANSWER☑️☑️...-A double layer of phospholipids that makes up plasma and organelle membranes. Parts of a phospholipid - ....ANSWER☑️☑️...-hydrophilic phosphate head, hydrophobic fatty acid tail, glycerol group Phospholipid bilayer - ....ANSWER☑️☑️...-two phospholipid layers arranged tail to tail within the plasma membrane Why is the phospholipid bilayer semi permeable - ....ANSWER☑️☑️...-they have a hydrophobic core so only some molecules can get through what can go through the bilayer - ....ANSWER☑️☑️...-small non-polar molecules, small polar molecules (slowly) Can water diffuse through the bilayer - ....ANSWER☑️☑️...-yes but very slowly FOR STUDY PURPOSES ONLY ©️ 2025 ALL RIGHTS RESERVED 1