Unit 7: Biomolecules — Online MCQ Test
CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 7: Biomolecules with a free chapter-wise online MCQ test.
This chapter covers: Focusing on biological chemistry this chapter covers carbohydrates classification monosaccharides disaccharides polysaccharides proteins amino acids peptide bonds nucleic acids DNA....
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Unit 7: Biomolecules — Important Questions & Answers
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.
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.
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.
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.
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.
Carbohydrates become more complex as monosaccharides join to form disaccharides, which further polymerize into polysaccharides. The other sequences are incorrectly arranged.