A) two carboxylic acid residues and one phosphate group
B) one carboxylic acid residue and two phosphate groups
C) three phosphate groups
D) three carboxylic acid residues
Correct Answer: A
Solution :
Phospholipids - Phosphate + glycerol + fatty acids + a nitrogen containing base. General formula: \[\begin{align} & \text{C}{{\text{H}}_{\text{2}}}\text{O}\text{.COR }\!\!'\!\!\text{ } \\ & \text{ }\!\!|\!\!\text{ } \\ & \text{CHOCOR }\!\!'\!\!\text{ }\!\!'\!\!\text{ } \\ & \text{ }\!\!|\!\!\text{ } \\ \end{align}\] \[\text{C}{{\text{H}}_{\text{2}}}\text{O}-\underset{\begin{smallmatrix} \text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ } \\ \text{O} \end{smallmatrix}}{\overset{\begin{smallmatrix} \text{OH} \\ \text{ }\!\!|\!\!\text{ } \end{smallmatrix}}{\mathop{\text{P}}}}\,-\text{O}-\text{X}\] \[\text{X=}\underset{\text{Ethanolamine}}{\mathop{\text{OHC}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{N}{{\text{H}}_{\text{2}}}\text{,}}}\,\]
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