Chapter 9: Biomolecules — Online MCQ Test
BIOLOGY · CLASS 11 INTER I YEAR · Andhra State Board
Practice Chapter 9: Biomolecules with a free chapter-wise online MCQ test.
This chapter covers: Carbohydrates Proteins Lipids Nucleic Acids Enzymes Amino Acids DNA RNA Biomolecules Metabolism.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 9: Biomolecules — Important Questions & Answers
Which of the following is a monosaccharide?
- A. Sucrose
- B. Glucose
- C. Starch
- D. Cellulose
Answer: B. Glucose
Glucose is a monosaccharide, meaning it is a simple sugar unit. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.
Glucose is a monosaccharide, meaning it is a simple sugar unit. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.
Proteins are made up of repeating units called:
- A. Nucleotides
- B. Fatty acids
- C. Amino acids
- D. Monosaccharides
Answer: C. Amino acids
Amino acids are the monomers of proteins. They join together through peptide bonds to form polypeptides and proteins.
Amino acids are the monomers of proteins. They join together through peptide bonds to form polypeptides and proteins.
Which carbohydrate is the main storage polysaccharide in plants?
- A. Glycogen
- B. Starch
- C. Cellulose
- D. Sucrose
Answer: B. Starch
Starch is the primary storage carbohydrate in plants. Glycogen is the storage polysaccharide in animals.
Starch is the primary storage carbohydrate in plants. Glycogen is the storage polysaccharide in animals.
Amino acids differ from one another mainly in their:
- A. Carboxyl group
- B. Amino group
- C. Side chain or R group
- D. Peptide bond
Answer: C. Side chain or R group
All amino acids have a common amino group, carboxyl group, and hydrogen atom attached to the alpha carbon. Their side chain or R group gives each amino acid its unique properties.
All amino acids have a common amino group, carboxyl group, and hydrogen atom attached to the alpha carbon. Their side chain or R group gives each amino acid its unique properties.
Which statement about enzymes is most accurate?
- A. They are consumed during the reaction
- B. They increase activation energy
- C. They are specific in action due to the active site
- D. They work equally well at all temperatures
Answer: C. They are specific in action due to the active site
Enzyme specificity depends on the complementary fit between the substrate and the active site. Enzymes are not consumed and they lower, not increase, activation energy.
Enzyme specificity depends on the complementary fit between the substrate and the active site. Enzymes are not consumed and they lower, not increase, activation energy.