Biology homework 6

A red blood cell placed in a hypertonic solution will shrink in a process called crenation. A red blood cell placed in a hypotonic solution will swell and potentially burst in a process called hemolysis. To prevent crenation or hemolysis, a cell must be placed in an isotonic solution such as 0.9% (m/v) NaCl or 5.0% (m/v) glucose. This does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes. A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur. Solution A: 3.21% (m/v) NaCl Solution B: 1.65% (m/v) glucose Solution C: distilled H2O Solution D: 6.97% (m/v) glucose Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl Drag each solution to the appropriate bin. Crenation Hemolysis Neither

Crenation: A, D, E Hemolysis: B & C

Which of these can RAPIDLY pass directly through the phospholipids of the plasma membrane, without the help of a transport protein?

A only (lipid soluble molecule)

If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?

Hypotonic

Which of the following particles could diffuse easily through a cell membrane?

Oxygen (O2)

Which student's model does the best job of showing membrane structure?

Rekik

Four students have done a nice job drawing membrane models. The models are drawn at different scales to serve different purposes. Order the students' models from most magnified to least magnified

Rekik, Thomas, Zubia, Elsa

A semipermeable membrane is placed between the following solutions?

Solution A: 1.4% (m/v) starch

A semipermeable membrane is placed between the following solutions. Which solution will increase in volume?

Solution D: 12.4% (m/v) NaCl

A trout moves from a warm environment into a cold environment. Predict how the saturation status of hydrocarbon chains might change to ensure proper membrane fluidity in the new cold environment.

The hydrocarbons would become less saturated to increase the fluidity of the membrane

What would occur if you added NaCl to the outside solution in this container?

The sodium and chloride ions would interact with water molecules outside the vesicle, resulting in water moving to the outside

What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?

Amphipathic nature

Which of the following statements is TRUE with regard to this animation?

Both sodium and potassium ions are transported against their concentration gradients

Which statement describes what happens once equilibrium is reached between the interior of a vesicle and the surrounding solution?

There is no directional movement of solute or water across the membrane

Which student's model does the best job of showing facilitated diffusion of a solute?

Thomas

True or False? Osmosis is a type of diffusion.

True

True or False? The water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group?

True

Your classmate has drawn four membrane models to try to remember how the lipid bilayer is built. Help her to select the best model

head outside tails inside towards each other

Facilitated diffusion is a type of

passive transport

Structure A is a

sloute

Which of the following models provides the best representation of facilitated diffusion via a "channel"?

the one with the green thing that has a passage in the middle

Structure A in the figure is a(n)

transport protein

Structure B is a

transport protein