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  1. >>Class 12
  2. >>Chemistry
  3. >>Biomolecules
Difficult Questions
3 min read

Biomolecules

- Are you well prepared? Practice hard questions to get more confident about the chapter.
1
When learning about proteins, be thorough with concepts like peptide bonds, the structure of alpha-helix and beta-pleated sheets, and the structure of important proteins like haemoglobin. Remember the number of polypeptide chains, the molecules that complete the quarternary structure, etc. Try solving one such question:
The number of polypeptide chains present in a molecule of haemoglobin is:
A
four
B
one
C
two
D
three
2
In this chapter, you'll come across many questions related to structure of carbohydrates. When answering such questions, pay close attention to the type of glycosidic linkages, the number of units forming the chain, and also the groups attached to each carbon atom in the structure.

Cellulose, upon acetylation with excess acetic anhydride (catalytic), gives cellulose triacetate, whose structure is:
A
B
C
D
3
Calculating Degree of Unsaturation (DOU) can be a little tricky. Although the formula is simple, you should be able to predict the reaction correctly and then substitute the right values for number of carbon atoms, number of monovalent atoms and number of trivalent atoms in the product to calculate the DOU.
In this reaction, compound Q is obtained from compound P via an ionic intermediate. What is the degree of unsaturation of Q?