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20 Jun 2019

Explain why nonpolar compounds are generally able to diffuse across biological membranes without the aid of a specific transport system.

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Reid WolffLv2

21 Jun 2019

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Membrane proteins tend to diffuse 3 to 30 times slower than proteins in the cytosol. Researchers are vey interested in knowing why membrane proteins diffuse slower than expected. Interestingly, purified membrane proteins incorporated into synthetic lipid bilayers diffuse crazy fast relative to the same protein in a native, biological membrane. What do you think explains the difference?

Shockingly, even lipids diffuse more slowly in biological membranes than in synthetic bilayers. What might be the cause of this strange behavior?

salmonspider398

1 Which of the following statements is false?

(a) CO₂ and O₂ can diffuse freely across the cell membranes.

(b) The differences in permeability between artificial lipid bilayers and cell membranes arise from variations in phospholipid content.

(d) Cells expend energy in the form of ATP hydrolysis to maintain ion concentrations that differ from those found outside the cell.

2 Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant inside a typical mammalian cell?

(a) Na⁺

(b) K⁺

(d) Cl^â

3 Pumps are transporters that are able to harness energy provided by other components in the cells and drive the movement of solutes across membranes, against their concentration gradient. This type of transport is called _____________.

(a) active transport.

(b) free diffusion.

(d) passive transport.

harlequinbuffalo618

Match each term

1.facilitated diffusion 2. Hypertonic solution
3. Hypotonic solution
4. Active Transport
5. Secondary acive transport
6. Simple Diffusion

A.	The transport of a nonpolar molar across a biological membrane from the compartment with a high concentration to one with low concentration.
B.	A process that utilizes energy to move compounds against a concentration gradient, i.e., from the compartment with lower concentration to one with a higher concentration.
C.	a solution that would cause blood cells to swell and burst
D.	a solution that would cause red blood cells to shrink
E.	The transport of a hydrophilic molecule across a biological membrane using an ion gradient created by an electrogenic pump.
F.	A process by which compounds are transported from a region of high concentration to one of lower concentration using membrane proteins as transporters.

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Explain why nonpolar compounds are generally able to diffuse across biological membranes without the aid of a specific transport system.

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