A given substance would require active transport across a lipid bilayer into a cell if... (choose all that apply): it has an electrical charge it is a large and polar it is present at a lower concentration inside the cell it is present at a higher concentration inside the cell

A given substance would require active transport across a lipid bilayer into a cell if... (choose all that apply): it has an electrical charge it is a large and polar it is present at a lower concentration inside the cell it is present at a higher concentration inside the cell

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 5RE: Using the answer code on the right, indicate which membrane component is responsible for the...

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Using the answer code on the right, indicate which membrane component is responsible for the function in question: 1. channel formation____________________________________ (a) lipid bilayer 2. barrier to passage of water- __________________ (b) proteins soluble substances ____________________________________ (c) carbohydrates 3. receptor sites 4. membrane fluidity 5. recognition of self 6. membrane-bound enzymes 7. structural boundary 8. carriers
The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobic
Which plasma membrane component can be either found on its surface or embedded in the membrane structure? a. protein b. cholesterol c. carbohydrate d. phospholipid
A given substance would require active transport across a lipid bilayer into a cell if... (choose all that apply): it has an electrical charge it is a large and polar it is present at a lower concentration inside the cell it is present at a higher concentration inside the cell
The rate of diffusion through a membrane increases if....(Select ALL that apply.) the phospholipid bilayer surface area is increased the phospholipid bilayer thins the concentration gradient difference is significantly increased the phospholipid bilayer membrane is more permeable to the molecule
Lipid bilayers are said to behave like two-dimensional fluids. What does this mean? What drives the movement of lipid molecules and proteins within the bilayer? How can such movement be measured? What factors affect the degree of membrane fluidity
The image below shows the movement of molecules across a plasma membrane. extracellular space lipid bilayer (cell membrane) TIMEI Source: LadyofHats small hydrophobic molecules intracellular space Using the image above, answer the following questions. (a) Identify the type of cell transport that is occurring in the image and justify your answer. (b) Explain the fluid mosaic model of the cell membrane as i relates to the movement of mole- cules illustrated in the figure. answer. (c) Predict the difference you would expect to see in the movement of illustrated molecules if they were to represent hydrophilic molecules rather than hydrophobic molecules. Justify your
A critical feature of the plasma membrane is that it is selectively permeable. This allows the plasma membrane to regulate transport across cellular boundaries--a function essential to any cell's existence. How does phospholipid structure prevent certain molecules from crossing the plasma membrane freely? Drag the labels to fill in the table. can cross easily have difficulty crossing the hydrophobic part transport protein required to cross efficiently Reset Help no transport protein required hydrophilic hydrophobic Type of molecule Nonpolar molecules Hydrophobic or Able to cross Transport protein hydrophilic? lipid bilayer? required? (a) b © (examples: hydrocarbons, O2, CO₂) Group 1 Group 3 Group 2 d e (f) Polar molecules (examples: water, sugars) Group 1 Group 3 Group 2 9 Ions h (examples: Na+, K+, Ca 2+, CI") Group 1 Group 3 Group 2
Membrane proteins move laterally in a phospholipid bilayer but generally not up and down. Why would this be so?
The plasma membrane of E. coli is approximately 75% protein and 25% phospholipid by weight. It is known that the average membrane protein molecular weight is 50,000 Da and an average membrane phospholipid molecular weight is 750 Da. Calculate the number of membrane phospholipid molecules present per molecule of membrane protein. number of membrane phospholipid molecules: molecules Select the additional information that one would need to calculate the fraction of membrane surface covered by phospholipids. the average densities of a 50,000 Da protein and a 750 Da phospholipid the number of moles of protein and phospholipid in the membrane the surface area of the E. coli cell the average cross-sectional areas of a 50,000 Da protein and a 750 Da phospholipid in a bilayer
The 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.
You 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 component