Chapter Exam

Unit 4 Chapter 9: Biomolecules — Online MCQ Test

Q: Which of the following is an example of a primary metabolite?

Answer: B. Protein — Proteins are primary metabolites because they are directly involved in growth and normal metabolism. Alkaloids, terpenoids, and pigments are secondary metabolites.

Q: The basic structural unit of proteins is:

Answer: C. Amino acid — Proteins are polymers made up of amino acids joined by peptide bonds. Other choices are building blocks of lipids, carbohydrates, and nucleic acids respectively.

Q: Which of the following monosaccharides is a hexose?

Answer: B. Glucose — Glucose is a six-carbon sugar, so it is a hexose. Ribose is a pentose, while glyceraldehyde and erythrose are trioses/tetroses.

BOTANY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 4 Chapter 9: Biomolecules with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR BOTANY. This chapter covers: This chapter covers primary and secondary metabolites chemical structure and properties of carbohydrates proteins amino acids lipids nucleic acids and enzyme mechanisms.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 4 Chapter 9: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR BOTANY — Unit 4 Chapter 9: Biomolecules, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an example of a primary metabolite?

A. Alkaloid
B. Protein ✓
C. Terpenoid
D. Pigment

Answer: B. Protein
Proteins are primary metabolites because they are directly involved in growth and normal metabolism. Alkaloids, terpenoids, and pigments are secondary metabolites.

The basic structural unit of proteins is:

A. Fatty acid
B. Monosaccharide
C. Amino acid ✓
D. Nucleotide

Answer: C. Amino acid
Proteins are polymers made up of amino acids joined by peptide bonds. Other choices are building blocks of lipids, carbohydrates, and nucleic acids respectively.

Which of the following monosaccharides is a hexose?

A. Ribose
B. Glucose ✓
C. Glyceraldehyde
D. Erythrose

Answer: B. Glucose
Glucose is a six-carbon sugar, so it is a hexose. Ribose is a pentose, while glyceraldehyde and erythrose are trioses/tetroses.

Which of the following statements about lipids is correct?

A. They are always polymers made of repeating monomers
B. They are soluble in water and insoluble in organic solvents
C. They are generally insoluble in water but soluble in non-polar solvents ✓
D. They always contain nitrogen

Answer: C. They are generally insoluble in water but soluble in non-polar solvents
Lipids are hydrophobic molecules, so they do not dissolve in water but dissolve in non-polar solvents like ether or chloroform. They are not true polymers in the usual sense.

Which of the following statements about enzymes is correct?

A. All enzymes are proteins and require no cofactors
B. Enzymes decrease activation energy and are highly specific ✓
C. Enzymes are consumed during the reaction
D. Enzymes change the equilibrium of the reaction permanently

Answer: B. Enzymes decrease activation energy and are highly specific
Enzymes act as biological catalysts by lowering activation energy and showing substrate specificity. They are not consumed and do not permanently change reaction equilibrium.