Bio 1201 exam 2 gregg Exam Questions With 100% Correct Answers
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Course
Bio 1201
Institution
Bio 1201
Bio 1201 exam 2 gregg Exam Questions With
100% Correct Answers
transport proteins - answerare responsible for controlling passage across the membrane
fluid mosaic model - answerThe membrane is a mosaic of protein molecules bobbing in a
fluid bilayer of phospholipids
fatty acid tails - answerno...
Bio 1201 exam 2 gregg Exam Questions With 100% Correct Answers transport proteins - answer✔✔are responsible for controlling passage across the membrane fluid mosaic model - answer✔✔The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids fatty acid tails - answer✔✔nonpolar, hydrophobic fatty acid heads - answer✔✔hydrophilic, polar periphial proteins - answer✔✔bound to the surface of the membrane integral proteins - answer✔✔penetrate the hydrophobic core (ones that span the membrane are transmembrane protiens How do cells recognize each o ther? - answer✔✔by binding to molecules, often containing carbohydrates, on the extracellular surface of the plasma membrane Glycolipids - answer✔✔Membrane carbohydrates that are covalently bonded to lipids. Hypdrophobic - answer✔✔molecules such as hydroca rbons that can dissolve in the lipid bilayer and pass through the membrane rapidly Hydrophilic - answer✔✔molecules that don't cross the membrane easily (ions and polar molecules) transport proteins - answer✔✔allow passage of hydrophilic substances across t he membrane carrier proteins - answer✔✔bind to molecules and change shape to shuttle them across the membrane passive transport - answer✔✔the diffusion of a substance across a membrane with no energy investment Diffusuion - answer✔✔Spreading out of particl es away from each other, from an area of high concentration to an area of low concentration. (move to where space is available) concentation gradient - answer✔✔substances diffuse from high concentration ----> low concentration Osmosis - answer✔✔Diffusion of water through a selectively permeable membrane Isotonic - answer✔✔when the concentration of two solutions is the same (no net movement) Hypertonic - answer✔✔cell losses water and shrivils hypertonic - answer✔✔cell gains water and expands In a plant cell w ater moves in and out affecting the size of what? - answer✔✔central vacuole facilitated diffusion - answer✔✔the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins ion channels - answer✔✔channel p roteins that transport ions gated channels - answer✔✔open or close in response to a stimulus active transport - answer✔✔requires energy (ATP) to move substances against their concentration gradient cotransport - answer✔✔coupled transport by a membrane prot ein transport proteins - answer✔✔small molecules leave through the lipid bilayer via___________? Phagocytosis - answer✔✔Cell eating Pinocytosis - answer✔✔Cell drinking hydrophilic tails - answer✔✔If a plasma membrane were compared to a sandwich, __________ would be considered the filling Metabolism - answer✔✔All of the chemical reactions that occur within an organism active transport - answer✔✔cytoplasm of cell has a higher concentration of k+ ions. How will K+ ions enter the cell? metabolic pathway - answer✔✔Begins with a specific molecule, which is then altered in a series of defined steps, resulting in a certain product. Energy - answer✔✔the capacity to cause change Law of Conservation of Energy - answer✔✔the law that states that energy cannot be created or destroyed but can be changed from one form to another second law of thermodynamics - answer✔✔Every energy transfer or transformation increases the entropy of the universe.
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