NEET UG CHEMISTRY Multiple Choice Questions (MCQs)
NEET UG Organic Chemistry - Biomolecules and Nitrogen Compounds (Questions 271-285)
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Which of the following is the basic structural unit of proteins?
- a) Fatty acids
- b) Amino acids
- c) Nucleotides
- d) Monosaccharides
Answer: b) Amino acids
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Which of the following is a disaccharide composed of glucose and fructose?
- a) Maltose
- b) Lactose
- c) Sucrose
- d) Cellulose
Answer: c) Sucrose
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Which of the following is a primary structure of a protein?
- a) The sequence of amino acids
- b) The folding into a helix
- c) The formation of a three-dimensional shape
- d) The bonding of multiple polypeptide chains
Answer: a) The sequence of amino acids
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Which of the following is a characteristic of enzymes?
- a) Enzymes are proteins that act as catalysts in biochemical reactions.
- b) Enzymes are lipids that speed up reactions.
- c) Enzymes have no effect on the activation energy of a reaction.
- d) Enzymes change the equilibrium of a reaction.
Answer: a) Enzymes are proteins that act as catalysts in biochemical reactions.
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Which of the following vitamins is water-soluble?
- a) Vitamin A
- b) Vitamin D
- c) Vitamin C
- d) Vitamin E
Answer: c) Vitamin C
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Which of the following is the function of DNA in living organisms?
- a) Energy storage
- b) Protein synthesis
- c) Carrying genetic information
- d) Catalyzing biochemical reactions
Answer: c) Carrying genetic information
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Which of the following is an aldose sugar?
- a) Fructose
- b) Glucose
- c) Galactose
- d) Sucrose
Answer: b) Glucose
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Which of the following is the bond that holds amino acids together in a protein?
- a) Hydrogen bond
- b) Phosphodiester bond
- c) Peptide bond
- d) Glycosidic bond
Answer: c) Peptide bond
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Which of the following hormones is responsible for regulating blood sugar levels?
- a) Insulin
- b) Thyroxine
- c) Estrogen
- d) Adrenaline
Answer: a) Insulin
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Which of the following is the quaternary structure of a protein?
- a) The sequence of amino acids
- b) The folding into an alpha-helix
- c) The association of multiple polypeptide chains
- d) The interaction of functional groups
Answer: c) The association of multiple polypeptide chains
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Which of the following is a ketose sugar?
- a) Glucose
- b) Fructose
- c) Galactose
- d) Sucrose
Answer: b) Fructose
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Which of the following nucleic acids is involved in protein synthesis?
- a) DNA
- b) RNA
- c) Both DNA and RNA
- d) Neither DNA nor RNA
Answer: b) RNA
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What is the structure of a nucleotide in DNA?
- a) A sugar, a phosphate group, and a nitrogenous base
- b) A sugar and a nitrogenous base only
- c) A nitrogenous base and an amino acid
- d) A sugar and an amino acid
Answer: a) A sugar, a phosphate group, and a nitrogenous base
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Which of the following is a function of proteins in the human body?
- a) Provide energy
- b) Store genetic information
- c) Act as enzymes to catalyze biochemical reactions
- d) Store oxygen
Answer: c) Act as enzymes to catalyze biochemical reactions
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What is the term for the breakdown of proteins due to changes in temperature or pH?
- a) Denaturation
- b) Condensation
- c) Polymerization
- d) Hydrolysis
Answer: a) Denaturation
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