Class 12 Biomolecules Mock Test (CBSE)

Topics in Biomolecules

• Carbohydrates and their classification
• Monosaccharides: glucose and fructose
• Disaccharides and polysaccharides
• Importance of carbohydrates
• Amino acids
• Proteins and their structure
• Denaturation of proteins
• Enzymes
• Vitamins
• Nucleic acids: DNA and RNA
• Hormones

Biomolecules practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following carbohydrates is classified as a non-reducing sugar?

   1. (a)Maltose
   2. (b)Sucrose
   3. (c)Fructose
   4. (d)Glucose
   Show answer and step marks

   1. Correct option: (b) Sucrose+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   Which of the following hormones contains iodine and is secreted by the thyroid gland?

   1. (a)Testosterone
   2. (b)Thyroxine
   3. (c)Insulin
   4. (d)Adrenaline
   Show answer and step marks

   1. Correct option: (b) Thyroxine+1

   Answer: (b)
3. Q3Short answer·3 marks
   (a) Name the type of linkage that holds together two monosaccharide units in a disaccharide. Give one example of a disaccharide. (b) Name the two components of starch and state one structural difference between them.
   Show answer and step marks

   1. (a) The linkage is a glycosidic linkage (an oxide linkage through an oxygen atom, formed with loss of water).+0.5
   2. (a) Example of a disaccharide, any one of: sucrose; maltose; lactose; or any other valid disaccharide.+0.5
   3. (b) First component of starch: amylose.+0.5
   4. (b) Second component of starch: amylopectin.+0.5
   5. (b) Structural difference: amylose is a linear (unbranched) chain of $\alpha$-$D$-glucose with $C_1-C_4$ glycosidic linkages, whereas amylopectin is branched, with $C_1-C_4$ linkages in the chains and $C_1-C_6$ linkages at the branch points.+1

   Answer: (a) Glycosidic linkage; e.g. sucrose (or maltose, lactose). (b) Amylose and amylopectin: amylose is a linear chain with $C_1-C_4$ links, amylopectin is branched with $C_1-C_4$ and $C_1-C_6$ links.

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