Paragraph Sty 3. Which of the following membranes would be the most fluid? A) B)

Question

Paragraph Sty 3. Which of the following membranes would be the most fluid? A) B) C) D) E) A bilayer made of lipids with polyunsaturated 18 carbon-fatty acids A bilayer made of lipids with saturated 18 carbon-fatty acids A bilayer made of lipids with saturated 16 carbon-fatty acids A bilayer made of lipids with polyunsaturated 16 carbon-fatty acids All of the above are equivalent in fluidity. 4. Most signal molecules A) easily diffuse through the membrane and bind to a receptor in the cytoplasm. B) bind to membrane receptors and transmit information across a membrane without

Explanation / Answer

Ans 3 : D) A bilayer made of lipids with polyunsaturated 16 carbon - fatty acids.

The ratio of unsaturated fatty acid to the saturated fatty acids determine the fluidity of the biological membranes.

Now the small chain fatty acids which are polyunsaturated contribute to the membrane fluidity to the maximum. This is because they are less viscous and highly susceptible to kinetic energy changes due to their lower molecular sizes.

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