Chapter Exam

Unit 7: Biomolecules — Online MCQ Test

Q: Which of the following is a monosaccharide?

Answer: A. Glucose — Glucose is a simple sugar and belongs to the monosaccharide class. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

Q: The bond formed between two amino acids is called:

Answer: B. Peptide bond — A peptide bond is formed when the carboxyl group of one amino acid reacts with the amino group of another amino acid. This is the linkage present in proteins.

Q: Which of the following is a reducing sugar?

Answer: B. Glucose — Glucose is a reducing sugar because it has a free aldehyde group in solution. Sucrose is non-reducing since both anomeric carbons are involved in bonding.

Q: In DNA, adenine pairs with:

Answer: C. Thymine — In DNA, adenine forms two hydrogen bonds with thymine. In RNA, adenine pairs with uracil instead.

Q: Which of the following is the correct sequence of biomolecular units in increasing complexity?

Answer: B. Monosaccharide → Disaccharide → Polysaccharide — Carbohydrates become more complex as monosaccharides join to form disaccharides, which further polymerize into polysaccharides. The other sequences are incorrectly arranged.

CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 7: Biomolecules with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY. This chapter covers: Focusing on biological chemistry this chapter covers carbohydrates classification monosaccharides disaccharides polysaccharides proteins amino acids peptide bonds nucleic acids DNA.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 7: Biomolecules — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY — Unit 7: Biomolecules, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a monosaccharide?

A. Glucose ✓
B. Sucrose
C. Starch
D. Cellulose

Answer: A. Glucose
Glucose is a simple sugar and belongs to the monosaccharide class. Sucrose is a disaccharide, while starch and cellulose are polysaccharides.

The bond formed between two amino acids is called:

A. Glycosidic bond
B. Peptide bond ✓
C. Hydrogen bond
D. Ester bond

Answer: B. Peptide bond
A peptide bond is formed when the carboxyl group of one amino acid reacts with the amino group of another amino acid. This is the linkage present in proteins.

Which of the following is a reducing sugar?

A. Sucrose
B. Glucose ✓
C. Starch
D. Cellulose

Answer: B. Glucose
Glucose is a reducing sugar because it has a free aldehyde group in solution. Sucrose is non-reducing since both anomeric carbons are involved in bonding.

In DNA, adenine pairs with:

A. Cytosine
B. Guanine
C. Thymine ✓
D. Uracil

Answer: C. Thymine
In DNA, adenine forms two hydrogen bonds with thymine. In RNA, adenine pairs with uracil instead.

Which of the following is the correct sequence of biomolecular units in increasing complexity?

A. Amino acid → Protein → Peptide
B. Monosaccharide → Disaccharide → Polysaccharide ✓
C. Nucleotide → DNA → Base
D. Fatty acid → Triglyceride → Amino acid

Answer: B. Monosaccharide → Disaccharide → Polysaccharide
Carbohydrates become more complex as monosaccharides join to form disaccharides, which further polymerize into polysaccharides. The other sequences are incorrectly arranged.

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