Which of the following statements about DNA is correct?
DNA is double-stranded and contains deoxyribose sugar and thymine instead of uracil.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Chemical Analysis and Biomolecules - Amino Acids Lipids
Focus on the chemical analysis of amino acids, lipids, and related biomolecules with practice questions for biology exams.
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Which biomolecule is responsible for the catalytic activity of ribozymes?
Ribozymes are RNA molecules that have enzymatic activity.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about amino acids is correct?
Amino acids contain an amino (-NH₂) group and a carboxyl (-COOH) group and are linked by peptide bonds, not phosphodiester bonds.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about amino acids is incorrect?
Amino acids contain nitrogen in their amino (-NH₂) group.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following is NOT an essential amino acid?
Glycine is a non-essential amino acid because the human body can synthesize it.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which biomolecule serves as the primary energy source in most organisms?
Carbohydrates serve as the primary energy source for most organisms, providing immediate energy through glucose metabolism.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about phospholipids is correct?
Phospholipids form the bilayer structure of cell membranes but do not contain peptide bonds or store genetic information.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which type of chemical reaction involves the removal of a water molecule to form a new bond?
Condensation reactions involve the removal of water to form bonds, such as peptide and glycosidic bonds.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about amino acids is correct?
Amino acids contain an amino (-NH₂) group and a carboxyl (-COOH) group. They are linked by peptide bonds, not glycosidic bonds.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following statements about lipids is correct?
Lipids are hydrophobic and do not dissolve in water. They do not contain amino acids or peptide bonds.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which macromolecule forms the primary structure of enzymes?
Enzymes are primarily composed of proteins, which act as biological catalysts.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids
Which of the following components is found in lecithin, a major phospholipid?
Lecithin is a phospholipid containing a phosphate group, essential for cell membrane structure.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Chemical Analysis and Biomolecules - Amino Acids Lipids