Unit 14 Biomolecules (Intext Questions-2)
Intext Questions
14.4 The melting points and solubility in water of amino acids are generally higher than that of the corresponding halo acids. Explain.
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Answer
Both acidic (carboxyl) as well as basic (amino) groups are present in the same molecule of amino acids. In aqueous solutions, the carboxyl group can lose a proton and the amino group can accept a proton, thus giving rise to a dipolar ion known as a zwitter ion.
Due to this dipolar behaviour, they have strong electrostatic interactions within them and with water. But halo-acids do not exhibit such dipolar behaviour.
For this reason, the melting points and the solubility of amino acids in water is higher than those of the corresponding halo-acids.
14.5 Where does the water present in the egg go after boiling the egg?
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Answer
When an egg is boiled, the proteins present inside the egg get denatured and coagulate. After boiling the egg, the water present in it is absorbed by the coagulated protein through $\mathrm{H}$-bonding.
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