Q4 of 31 Page 43

An aminoacid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of aminoacid is called

At physiological pH, -COOH group dissociates to form a negatively charged carboxylate ion –COO- and amino acid gets protonated to form positively charged NH3+ forming zwitter ion.


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2

Many elements are found in living organisms either free or in the form of compounds. Which of the following is not found in living organisms?

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Aminoacids, have both an amino group and a carboxyl group in their structure. Which one of the following is an amino acid?

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Sugars are technically called carbohydrates, referring to the fact that their formulae are only multiple of C(H2O). Hexoses therefore have six carbons, twelve hydrogens and six oxygen atoms. Glucose is a hexose. Choose from among the following another hexose.

 6

When you take cells or tissue pieces and grind them with an acid in a mortar and pestle, all the small biomolecules dissolve in the acid. Proteins, polysaccharides and nucleic acids are insoluble in mineral acid and get precipitated. The acid soluble compounds include aminoacids, nucleosides, small sugars etc. When one adds a phosphate group to a nucleoside, one gets another acid soluble biomolecule called