In this experiment 4 dialysis tubes filled with unknown starch concentrations were placed into beakers with 10% starch solutions. The bags were weighed every 10 minutes for an hour to measure osmosis. Use the figure to answer the following questions. Which bag(s) was(were) in a hypertonic environment? Select any that apply.  Question options:   Bag 1   Bag 2   Bag 3   Bag 4

Plate A = filter paper dipped into 5% solution of unknown Dye A %3D Plate B = filter paper dipped into 5% solution of unknown Dye B Both plates were incubated at 37°C. At the end of the 60 minute incubation period the diffusion rings for each dye were measured. The diffusion ring for Dye A = 40 mm. The diffusion ring for Dye B = 24 mm %3D Based on the results, which dye had the higher molecular weight? Explain your answer.

You are working in an emergency care center. A person comes in dehydrated and the physician orders a hypertonic solution. Explain why this solution is used instead of an isotonic solution.

The cell membrane is permeable to water but not to ions.  Select all that apply. Question options:   Beaker A is isotonic to the cell.    Some water in cell A is moving in and out of the cell.    There is a net movement of water into Cell B.    Beaker C is hypotonic to Cell C.

The beaker is divided into two compartments (C and D) that has equal volumes of solution separated by an artificial membrane that has a pore size of 23 Å (Angstrom). Explain the movement of solute after eight hours if comparment C has 17 % sucrose while the compartment D has 2 % sucrose (diameter of sucrose molecule = 9 Å (Angstrom))

On the graph that relates absorbance to flavin concentration, draw a horizontal line that starts at the point on the y-axis that corresponds to the absorbance of your unknown sample and ends at the curve you drew through your data points . Next draw a vertical line that starts at the point where the horizontal line intersected the curve and ends at the x-axis. The point where this vertical line intersects the x-axis corresponds to the concentration of flavin in your unknown sample. What was the letter on the tube with your unknown sample? What is the concentration of the flavin in your unknown

An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane (but with no cell wall) is immersed in a beaker containing an aqueous solution. The outside environment concentration consists of 0.01 M glucose and the inside of the cell has a concentration of 5.0 M glucose. The plasma membrane is permeable to water and monosaccharides, but impermeable to the disaccharides. Complete the following for the image below: Is the glucose going down or against its concentration gradient? Is the movement of the solute in the cell going out of the cell?       Down...Yes     Down...No     Against...Yes     Against...No

A 5mL sample diluted 1:1 with trypan blue is counted using a hemocytometer. A total of 325 viable cells and 52 dead cells were counted in the four corner square and the big central square of the meter. What is the total number of dead cells per mL of the sample?

Various chemical methods can be used to permeabilize or lyse cells including the use of enzymes. List three important factors to consider when developing a lysis method using enzymes.   Estimate the osmotic pressure drop across the membrane of an animal cell in a 0.10 M NaCl solution, assuming that the internal total solute concentration is 0.36 osM and temperature is 30.0°C. Do you think that this pressure drop would lyse cells? Why or why not?

A 139 lb male patient with severe lactate acidosis is given isotonic sodium lactate. The doctor orders isotonic sodium lactate 50. mL/ kg body mass to be administered intravenously. The rate of flow is 150 gtts/min, and the IV administration set delivers 20. gtts/mL, where the unit “gtts” stands for drops of liquid. Calculate what is the running time in minutes will be? Show all your calculations