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Ch. 7 - Membrane Structure and Function
All textbooksCampbell 12th EditionCh. 7 - Membrane Structure and FunctionProblem 5
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Chapter 7, Problem 5

Based on Figure 7.18, which of these experimental treatments would increase the rate of sucrose transport into a plant cell? a. decreasing extracellular sucrose concentration b. decreasing extracellular pH c. decreasing cytoplasmic pH d. adding a substance that makes the membrane more permeable to hydrogen ions

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Hi everyone here, we have a question asking a blank and ph will result in increased permeability of plasma membrane for sucrose. So we have to remember that ph and permanent permeability are inversely related. This means the higher the ph, the lower the permeability and the lower the ph the higher the permeability. So if we're wanting to increase permeability, we need to decrease ph So out of our answer choice, a decrease be increased, See slight change or d extreme change. Our answer is a decrease. Thank you for watching. Bye.
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Textbook Question

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly a. spread in a continuous layer over the inner and outer surfaces of the membrane. b. confined to the hydrophobic interior of the membrane. c. embedded in a lipid bilayer. d. randomly oriented in the membrane, with no fixed inside-outside polarity.

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Textbook Question

Which of the following factors would tend to increase membrane fluidity? a. a greater proportion of unsaturated phospholipids b. a greater proportion of saturated phospholipids c. a lower temperature d. a relatively high protein content in the membrane

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Textbook Question

Which of the following processes includes all the others? a. osmosis b. diffusion of a solute across a membrane c. passive transport d. transport of an ion down its electrochemical gradient

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Textbook Question

DRAW IT An artificial 'cell' consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the 'environment,' as shown in the accompanying diagram. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. a. Draw solid arrows to indicate the net movement of solutes into and/or out of the cell. b. Is the solution outside the cell isotonic, hypotonic, or hypertonic? c. Draw a dashed arrow to show the net osmosis, if any. d. Will the artificial cell become more flaccid, more turgid, or stay the same? e. Eventually, will the two solutions have the same or different solute concentrations?

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