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STD 11 - 9. Biomolecules — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 9. Biomolecules1 Mark
MCQ
Which one of the following biomolecules is correctly characterized?
  • ✓
    Lecithin ­ a phosphorylated glyceride found in cell membrane.
  • B
    Palmitic acid ­ an unsaturated fatty acid with 18 carbon atoms.
  • C
    Adenylic acid ­ adenosine with a glucose phosphate molecule.
  • D
    Alanine amino acid ­ contains an amino group and an acidic group anywhere in the molecule.
✓

Answer

Correct option: A.
Lecithin ­ a phosphorylated glyceride found in cell membrane.
a
(a)  Lecithin is a triglyceride lipid where one fatty acid is replaced by phosphoric acid which is linked to additional nitrogenous group called choline. It is a common membrane lipid. It is an amphipathic phospholipid having both hydrophilic polar and hydrophobic nonpolar groups. The hydrocarbon chains of two fatty acids function as hydrophobic non­ polar tails whereas the phosphate and choline behave as hydrophilic polar head group of the molecule.Palmitic acid is a saturated fatty acid (as it does not possess double bonds in its carbon chain) and contains 16 carbon atoms with formula Adenylic acid or adenosine monophosphate is a nucleotide formed by union of adenine (nitrogenous base), ribose (pentose sugar) and phosphate. It is formed through phosphorylation of nucleoside as phosphate combines with sugar molecule at its 5? carbon atom. Amino acids are organic acids with carboxylic group $(-COOH)$ having amino group $(-NH_2)$ generally attached to ?­carbon or carbon next to carboxylic group. Alanine is a nonpolar and neutral amino acid having one methyl group and having amino group attached to carbon next to carboxylic group.

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