37. Which of the following is a common feature of lipids? (a) All lipids have gl

Question

37.     Which of the following is a common feature of lipids?

(a)      All lipids have glycerol in their structures.

(b)      All lipids have fatty acids in their structures.

(c)      All lipids have hydrophobic regions in their structures.

(d)      No lipids have hydrophilic regions in their structures.

(e)      More than one of the above is true.

38.     Which of the following statements is true?

(a)      Fatty acids with a greater degree of saturation have fewer C=C double bonds and form glycerides have higher melting points.

(b)      Fatty acids with a greater degree of saturation have more C=C double bonds and form glycerides have higher melting points.

(c)      Fatty acids with a greater degree of saturation have fewer C=C double bonds and form glycerides have lower melting points.

(d)      Fatty acids with a greater degree of saturation have more C=C double bonds and form glycerides have lower melting points.

Explanation / Answer

37.

(b)      All lipids have fatty acids in their structures.

(c)      All lipids have hydrophobic regions in their structures.

A common feature of all lipids is their inability to dissolve in water due to presence of long chain fatty acids in their structure which are hydrophobic in nature although they dissolve in variety of organic solvents.

38. (d)      Fatty acids with a greater degree of saturation have more C=C double bonds and form glycerides have lower melting points.

The intermolecular interactions are much weaker in unsaturated fattyacids than saturated fattyacids. So melting points are much lower in unsaturated fattyacids

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