The Motion of Lipid Molecules in a Synthetic Bilayer Can

question 11

Multiple Choice

The motion of lipid molecules in a synthetic bilayer can be studied by various techniques. Which of the following has been observed in these systems?

• A) Phospholipids diffuse rapidly within and between the two leaflets of a bilayer.
• B) An average lipid molecule can diffuse the length of about 2 micrometers in a fraction of a millisecond.
• C) The flip-flops are very rare for phospholipids but cholesterol molecules flip-flop more often.
• D) Within a bilayer, lipid molecules rarely rotate about their long axis, but diffuse laterally at very high rates.
• E) All of the above.

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