8. Phosphate buffered saline (PBS) is often used as an isotonic solution to keep cells happy and alive. Though recipes vary, PBStypically contains 157 mM Na* and 4.5 mM K+, yet inside of the cell that ratio is switched (there is approximately 150 mM K*and only about 10 mM Nat). Why is PBS still considered isotonic? That is, why does putting cells into PBS not create a lot ofosmotic pressure?

Osmosis is the movement of water across the semipermeable membrane driven by the difference in…

Answered: 8. Phosphate buffered saline (PBS) is…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter5: Membranes And Transport

Section: Chapter Questions

Problem 8TYK

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Which of the following statements is true for the figure in question 8? a. The net movement of solutes is into the cell. b. There is no concentration gradient. c. There is a potential for plasmolysis. d. The solvent will move against its concentration gradient. e. If this were a plant cell, turgor pressure would be maintained.
The principal force driving movement in diffusion is the. temperature particle size concentration gradient membrane surface area
A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with one from the Mojave Desert. Which hypothesis is most likely to be correct? The cells from the Mediterranean coast animal will have more fluid plasma membranes The cells from the Mojave Desert animal will have a higher cholesterol concentration in the plasma membranes The cells’ plasma membranes will be indistinguishable The cells from the Mediterranean coast animal will have a higher glycoprotein content, while the cells from the Mojave Desert animal will have a higher lipoprotein content.
7) Which is the best definition of osmosis?a) movement of molecules from an area of their higher concentration to an area of their lower concentrationb) movement of water across a membrane from an area of high concentration to a lower concentration.c) movement of molecules from an area of their lower concentration to an area of their higher concentration.d) movement of water across a semipermeable membrane from an area of low concentration to a higher water concentration with the use of ATP.e) movement of water across a semipermeable membrane from an area of high concentration to a lower concentration.8) Transcriptional factors are required for transcription in all the following organisms except: a) Protozoa b) Bacteria c) Archaea d) Eukarya e) b & c.9) The composition of the flagellar apparatus is more complex in ___ as compared to Prokaryotes: a) Protozoa b) Bacteria c) Archaea d) Mycota e) a & d
4. The diagram below illustrates a red blood cell in three different solutions. Identify eachsolution as being hypertonic, hypotonic or isotonic.
8. If two solutions with concentrations of 0.2 M sugar and 0.4 M sugar respectively are separated by a semipermeable membrane, during osmosis, what is the direction of the net flow? a. Sugar molecules from the concentrated to the dilute solution b. Sugar molecules from the dilute to the concentrated solution c. Water molecules from the concentrated to the dilute solution d. Water molecules from the dilute to the concentrated solution
1. Define Osmosis. 2. Describe in detail, the similarities between osmosis and diffusion. Make sure you make a statement about each process. 3.As the solute concentration rises from 0% up to 100% of solute, what happens to the solvent concentration?
31. What will cause the cell to shrink when placed in hypertonic solution? A. No difference in concentration of water molecules inside and outside the cell B. Constant concentration of water molecules inside and outside the cell C. Lower concentration of water molecules inside the cell than outside D. Greater concentration of water molecules inside the cell than outside
8.Patients who enter the emergency room dehydrated are usually given sterile saline solution intravenously. The solution administered is isotonic to prevent cell damage. What would happen if the solution was hypotonic? Group of answer choices A. Hypotonic solutions have a higher osmotic pressure than that within cells so hemolysis can occur B. Hypotonic solutions have a lower osmotic pressure than that within cells so crenation can occur can occur. C. Hypotonic solutions have a lower osmotic pressure than that within cells so hemolysis can occur. D. Hypotonic solutions have the same osmotic pressure as that within cells so nothing will happen. 9.The solubility of CaCl2 in water is135g/100 ml. What would be the best method for preparing a 50.0 mL of supersaturated CaCl2 solution? Group of answer choices A. add 72 g of CaCl2 to 50.0 mL of H2O at 100 °C while stirring at room temperature B. add 67 g of CaCl2 to 50.0 mL of H2O at 100 °C while stirring at room temperature…
8. Which of the following ion transport functions must be carried out by a pump? a. transport of Na+ from the extracellular space to the cytosol b. transport of glucose from the extracellular space to the cytosol c. transport of K+ from the cytosol to the extracellular space d. transport of Na+ from the cytosol to the nucleus e. transport of Na+ from the cytosol to the extracellular space.
7. Which of the following membrane transport proteins would you expect to be the most selective (although not the most rapid)? the bicarbonate ion channel the glucose carrier protein the potassium ion channel the chloride ion channel the sodium ion channel
1. In a passive process (passive transport) across a cell's plasma membrane, ______ differences drive the movement; while in an active process, the cell provides ______ to power the transport process. A. concentration, ATP B. ATP, concentration C. differential permeability , driving force D. driving force, differential permeability

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