Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 2LTB
Add labels to the figure that follows, which illustrates some molecules that can and cannot pass through cell membranes unaided.
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Below are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane.
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sodium, propanol, alanine, estrogen
estrogen, propanol, sodium, alanine
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Imagine that a cell has a plasma membrane made ONLY of phospholipids and contains no proteins. Classify the molecules listed below
according to whether or not they are likely to diffuse across the plasma membrane.
Fatty acids
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Slow/No Diffusion
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hormones
Compare and contrast the four basically different ways that a substance can move across the plasma membrane. Present it in a matrix.
Chapter 3 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 3 - Prob. 1LTBCh. 3 - Add labels to the figure that follows, which...Ch. 3 - Prob. 3LTBCh. 3 - Which of the following is not a function of water?...Ch. 3 - Prob. 5LTBCh. 3 - Prob. 6LTBCh. 3 - Prob. 7LTBCh. 3 - Prob. 8LTBCh. 3 - Which of the following forms of membrane transport...Ch. 3 - Prob. 10LTB
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- A section of a cell membrane Is shown in the diagram below. CELL MEMBRANE Low Concentration of Substances Outside Cell Cell Membrane Inside Cell High Concentration of Substances Which type of membrane transport by a carrier proteln is most likely shown in the diagram if energy is NOT being used? osmosis simple diffusion active transport facilitated diffusion Direction of Substance Movementarrow_forwardFrom the following list, choose TWO molecules capable of freely diffusing across the plasma membrane (i.e. no transport protein needed). nucleic acid V small charged electrolyte carbohydrate V nonpolar lipid hydrophilic protein hydrophobic moleculearrow_forwardYou will create a hand drawn, 2-dimensional, labelled diagram of the plasma membrane (not a 3D diagram). Label the following structures in your diagram: A phospholipid A peripheral protein An integral protein A cholesterol Intracellular and extracellular portion of the membrane Hydrophobic and hydrophilic areas Also include a detailed drawing of a single phospholipid labeling its componentarrow_forward
- Examples of a molecule that cannot pass through the cell membrane? Can pass but with assistace? Can freely pass?arrow_forwardDraw and label a cell lipid bilayer and diagram how the following transport processes take place: passive diffusion of oxygen into the cell, facilitated diffusion of potassium into the cell, active transport of sucrose into the cell. Using different symbols (circles for oxygen, squares for sucrose, and triangles for potassium ions), show the relative concentrations (gradients) of these substances on the inside and outside of the cell. For example, to show that oxygen enters the cell by going “down” its gradient, you would draw more circles on the outside of the cell than inside the cell. Be sure to show and label membrane proteins when appropriate, and show the electric membrane potential using “+”s (pluses) on one side and “-”s (minuses) on the other side of the membrane. Also show the proton pump which uses ATP as a source of energy.arrow_forwardThe figure below illustrates a portion of a cell membrane. X denotes a membrane-spanning protein channel. Illustration of a partial cell membrane Which of the following is most likely true about the structure of X X A The upper and lower ends of X are hydrophilic and its middle is hydrophobic. C D The upper and lower ends of X, as well as its middle, are all hydrophobic. The upper and lower ends of X are hydrophobic and its middle is hydrophilic. The upper and lower ends of X, as well as its middle, are all hydrophilic.arrow_forward
- Draw a lipid bilayer, and focus on three lipids that are on the same side of the membrane. Color in the areas where you expect the hydrophobic interactions, and in another color, shade in the areas that are hydrophilic. Draw another lipid bilayer, and for this one, include two membrane proteins. One of them should be an integral membrane protein and the other one a peripheral membrane protein. Label the lipid bilayer, the side the faces the cytoplasm and the side that faces outside the cell. Also label the two proteins, and shade in the areas where you predict that you would find hydrophobic amino acids and hydrophilic amino acids.arrow_forwardAccording to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? They frequently flip-flop from one side of the membrane to the other. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane. They are free to depart from the membrane and dissolve in the surrounding solution.arrow_forwardList three molecules or types of molecules that can cross a lipid bilayer through simple diffusion. List three molecules or types of molecules that cannot easily diffuse across a lipid bilayer.arrow_forward
- Sketch out a cross section of a cell membrane showing the a proposed transporter involved in either diffusion or active transport. Include and label the following phospholipid bilayer show head group and tails .hydrophilic and hydrophobic region labeledarrow_forwardThe cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.arrow_forwardThe fluid mosaic model of the membrane describes the membrane as: containing a significant quantity of water in the interior composed of fluid phospholipids on the outside and protein on the inside composed of proteins on the outside and phospholipids on the inside made of proteins embedded into a fluid phospholipid bilayerarrow_forward
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