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According to Fick’s diffusion equation, what variables determine a molecule’s rate of diffusion in bulk solution? When considering diffusion across membranes, what other factor(s) will influence the rate of diffusion of the molecule across that membrane?

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Nelly Stracke
Nelly StrackeLv2
28 Sep 2019

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Related questions

11. Synthesis of ATP using the energy released as a proton diffuses down a concentration gradient involves the conversion of concentration gradient energy into chemical energy—True or false?

12. In the absence of active transport of a molecule, a simple or facilitated diffusion of the molecule will result in an equilibrium of the molecule across the membrane—True or false?

13. In the absence of an active transport of a molecule, a simple or facilitated diffusion of the molecule across a membrane will result in zero energy available to do work—True or false?

14. If biological membranes were permeable to all solutes osmosis could not occur because the concentration of water will be same on both sides of the membrane—True or false?

1. Identify and explain the property of cellulose membranes and cell membranes that allows some substance to pass through the membrane, while other substances cannot.

2. What do we call the state in a system when net diffusion has stopped?

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.

(c) Direction of passive transport of molecules across membrane is controlled by osmosis and electrochemical gradient.

(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+

(c) Ca2+

(d) Cl–

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.

(c) positive diffusion.

(d) passive transport.

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