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- The principal force driving movement in diffusion is______. a. temperature b. particle size c. concentration gradient d. membrane surface areaWhich of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot transport a substance and also hydrolyze ATP. b. they retain their same shape as they perform different roles. c. their primary role is to move negatively charged ions across membrances. d. they move Na+ into a neural cell and K+ out of the same cell. e. they act to establish an electrochemical gradient.
- 1. Name the two forms of passive transport. 2. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is. 3. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.1. Explain why the graph obtained for facilitated diffusion when velocity of transport of a given molecule is plotted against its concentration is a hyperbola. In your answer, highlight the events that occur along the hyperbola.1. List the differences between passive diffusion and facilitated diffusion.
- 1. Qualitative thinking: For diffusion, it is important to understand the differences between diffusion rate and diffusive flux. a. Define diffusive flux and diffusion rate and write their equations based on Fick's first law. b. Write an equation that relates the two and show how the units balance on each side. c. Fill in the what happens to diffusive flux and diffusion rate (increases, decreases or stays the same) when the variables in the left column changes as noted: Variable Concentration difference, AC Diffusion distance, Ax Diffusion area, A Diffusion coefficient, D Change Increases Increases Increases Increases Diffusive flux Diffusion rate1. Circle all of the following that are examples of diffusion. Explain why each is an example of diffusion. a. water moving through a hose c. the smell of chocolate chip cookies d. a rock sinking in a lake e. haze in the sky from a wildfire b. a drop of ink spreading through water F. coffee dripping through a filter.1. With reference to a named, specific example, describe the processes involved in channel mediated diffusion. In your answe state what kind of transport it is.
- 1. Define osmosis, simple diffusion, facilitated diffusion. 2.. Identify why each of these is a form of passive transport. 3. Give examples of each type of passive transport.The comparison of the simple diffusion, facilitated diffusion and active transport are shown in the table below: * Which comparisons are TRUE? Simple Diffusion Facilitated Diffusion Active Transport I Require ATP Does not require ATP Require ATP II Does not involve a Involve a transport Involve a transport transport protein protein protein From a region of higher III From a region of higher concentrațion of substance to a region of lower concentration of From a region of lower concentration of concentration of substance to a region of lower concentration of substance. substance to a region of higher concentration of substance. substance. O I and II only I and III only O Il and III only O I, Il and IIIWhich of the following statements is correct about passive facilitated diffusion? (select all that apply) V It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). O It requires a transport protein. O It requires an expenditure of energy by the cell. O It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). O It involves movement of molecules up a concentration gradient and requires a transport protein.