CBSE Class 12 Chemistry Biomolecules Board Exam Notes

BIOMOLECULES 

QUESTIONS
VSA TYPE QUESTIONS (1 - MARK QUESTIONS)
1. How many asymmetric carbon atoms are present in D (+) glucose?
2. Give the significance of (+)-sign in the name D- (+)-glucose.
3. Give the significance of prefix ‘D’ in the name D- (+)-glucose.
4. Why is sucrose called invert sugar?
5. Write the Zwitter ionic form of amino acetic acid. (H2NCH2COOH).
6. How would you explain the amphoteric behaviour of amino acids?
7. Which nucleic acid is responsible for carrying out protein synthesis in the cell?
8. The two strands in DNA are not identical but complementary. Explain.
9. What type of linkage holds together the monomers of DNA and RNA?
10. Mention the number of hydrogen bonds between adenine and thymine.

Answers
1. 4
2. (+) sign indicates dextrorotatory nature of glucose.
3.‘D’ Signifies that –OH group on C-5 is on the right hand side
4.When sucrose is hydrolyzed by water, the optical rotation of solution
changes from positive to negative.
5.Amino acids are amphoteric due to the presence of both acidic and
basic functional groups.
6.Amphoteric behavior.
7.RNA
8. complementary bases are prepared.
9.H-bonding is present between specific pairs of bases present in strands.
10.Phosphodiester linkage.

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