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Biomolecules

Short Answer Type

1. Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain.

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What are the expected products of hydrolysed of lactose?

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How do you explain the absence of aldehyde group in the penta acetate of D-glucose?

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The melting points and solubility of water of amino acids are generally higher than that of the corresponding halo acids. Explain.

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Where does the water present in the egg go after the boiling the egg?

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6. Why cannot vitamin C be stored in our body?

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What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?

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8.
When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA?

Complete hydrolysis of RNA yields a pentose sugar(D-ribose), phosphoric acid and nitrogen containing heterocyclic compounds (called bases). Such as guanine (G), cytosine (C), Uracil (U), Adenine (A).

There is no relationship among the quantities of four bases obtained on complete hydrolysis of RNA. It is because base sequence in RNA is not fixed but depend on base sequence in DNA i.e., the base sequence in a specific RNA is controlled by that of DNA which is controlling RNA synthesis (i.e., transcription). The base sequence in DNA indirectly controls the sequence of amino acids in the protein.

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