In the scenario shown above, the green spheres are Glucose molecules and the blue dots are water molecules. What effect will the addition of energy in the form of heat change how these molecules move across a membrane? A
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- Quantitative – diffusion time: Consider a spherical, single-celled organism which needs oxygen tosurvive. a. Assume oxygen needs to diffuse from the outside of the cell to its center. Write an equation thatgives the diffusion time in terms of the cell radius. b. The cell has a 4 micron (m) diameter, and diffusion coefficient of oxygen is 1.8 x 10-5 cm2/s inwater (assume diffusion is the same through the cell membrane). How long does it take for oxygento diffuse to the center of the cell? c. Cells typically need key molecules such as oxygen to survive. Diffusion times of oxygen can limithow big cells can become. If the cell gets too large for oxygen to reach its center, the cell coulddie. Calculate the size of a cell at which oxygen diffusion time becomes too slow and so limits theability of the cell to get that big. Explain your assumptions. How does this compare to typical cellsizes?Both H+ and Ca2+ are ions that move through thecytosol. Why is the movement of H+ ions so much fasterthan that of Ca2+ ions? How do you suppose the speed ofthese two ions would be affected by freezing the solution?Would you expect them to move faster or slower? Explainyour answer.Diffusion experiments of a small molecule drug in tissue samples are performed. The drug has a radius of 2.24 nm and a pure-water diffusivity of 2.75 x 10^-6 cm^2/s. Cells occupy approximately 72% of the tissue byvolume. The molecule is very hydrophilic and does not readily cross cellular membranes. If you assume that the interstitial space is gel-like with a microstructure parameter k=3.7 x 10^-3 nm^-1, what is the effective diffusivity in the tissue?
- The average time it takes for a molecule to diffuse adistance of x cm is given byt = x2/2D where t is the time in seconds and D is the diffusioncoefficient. Given that the diffusion coefficient ofglucose is 5.7 × 10−7cm2/s, calculate the time it wouldtake for a glucose molecule to diffuse 10 μm, which isroughly the size of a cell.Diffusion and Osmosis What is your prediction about the effect of molecular weight on rate of diffusion? What is your prediction about the effect of temperature on rate of diffusion?Understand Diffusion One gram of sodium chloride will take longer to dissolve in a solution of 2 M glucose than in a solution of pure water. What is the most reasonable explanation for this observation? Multiple Choice O O O sodium chloride will form stronger ionic contacts in 2 M glucose than in water, slowing its rate of dissolution and diffusion sodium chloride is more hydrophobic in a glucose solution than it is in water, reducing its solubility and diffusion sodium chloride will encounter a greater frequency of collisions in a 2 M glucose solution than in water, slowing its diffusion glucose will form a hydration shell around sodium chloride, slowing its interactions with water and therefore reducing its solubility
- conline.austincc.edu/ultra/courses/_891351_1/cl/outline 8 Match each of the following with their best description: Question movement of molecule down their concentration gradient using kinetic energy movement of water molecules down their concentration gradient using kinetic energy type of transport that moves large macromolecules or cell structures requiring ATP type of transport required to move large molecules down their concentration gradient All Answer Choices A. diffusion B. facilitated diffusion C. protein mediated active transport D. vesicle transport E. osmosis ra....docx A Biol 1406 - Pra....docx Biol 1406 - LA....docx Selected Match A. diffusion B. facilitated diffusion C. protein mediated active transport D. vesicle transport CollegeScores2y....csvPhospholipid lateral motion in membranes is characterized by a diffusion coefficient of about 1 x 10-8 cm2/sec. The distance traveled in the membrane in a given time is r = √4Dt, where r is the distance traveled in centimeters is the diffusion coefficient, and t is the time during which diffusion occurs. Calculate the distance (in nanometers) traveled by a phospholipid in a bilayer in 25 msec (milliseconds).For this practice problem, would the answer be c)NaCl? My reasoning behind this is because molecules under 100 Da can use simple diffusion, while nonpolar molecules and larger molecules like benzene can use channels via facilitated diffusion. However, NaCl dissociates into ions and cannot readily use diffusion?
- b pdf.01# 9 s -> 1 BIO( علوم حياتية عامة لطلبة الكليا Which of the following processes includes all the others? O a. Facilitated diffusion O b. Passive transport Oc Osmosis O d. Diffusion Clear my choice 2 ) 1 1 BIO( علوم حياتية عامة لطلبة الكلQualitative thinking: For diffusion, we need to keep straight the difference between diffusion rate and diffusive flux. a. How do diffusive flux and diffusion rate differ? How do their units differ? b. Give an equation that relates the two. c. Based on Fick's equation for diffusive flux, what are some conditions that would increase flux and rate?Unit 2: Cells Test Review Cell Transport Label the following pictures: active transport, passive osmosis, passive diffusion, or passive facilitated diffusion. We o Why does Active Transport require ATP energy? What is your vocabulary word that means balance/ equillibrlum? Solutions 1. Label the below images of solutions: hypertonic, hypOtonic, or isotonic. 2. Write if the cell will be at equilibrium, shrink, or swell. 3. Explain where the most water is (inside the cell or outside the cell). 4. Explain where most of the water will move (inside the cell or outside the cell). Water O Water Water Water o O Water Water O Solute O Solute O Solute Explain if water will fNow into or out of the cell in the following scenarios: 1. Salt is 30% inside the cell and 35% outside the cell. • Water is % inside the cell % outside the cell • Waler will flow [inside /outsidel so the cell can reach equilibrium.