Proteins MCQs with answers Page - 2

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Q. Which of the following elements is always present in proteins?

  • (A) Carbon, Hydrogen, Oxygen, and Nitrogen
  • (B) Carbon, Hydrogen, and Oxygen only
  • (C) Carbon and Hydrogen only
  • (D) Carbon, Hydrogen, Oxygen, and Phosphorus

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Q. What is the simplest amino acid?

  • (A) Alanine
  • (B) Glycine
  • (C) Serine
  • (D) Cysteine

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Q. The bond between amino acids in a protein is called a:

  • (A) Phosphodiester bond
  • (B) Peptide bond
  • (C) Hydrogen bond
  • (D) Glycosidic bond

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Q. What is the term for a sequence of amino acids linked by peptide bonds?

  • (A) Polypeptide
  • (B) Polynucleotide
  • (C) Polysaccharide
  • (D) Polymerase

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Q. What structure of protein is determined by the sequence of amino acids?

  • (A) Primary structure
  • (B) Secondary structure
  • (C) Tertiary structure
  • (D) Quaternary structure

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Q. Which type of protein structure includes alpha-helices and beta-pleated sheets?

  • (A) Primary
  • (B) Secondary
  • (C) Tertiary
  • (D) Quaternary

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Q. Which level of protein structure determines its overall 3D shape?

  • (A) Primary structure
  • (B) Secondary structure
  • (C) Tertiary structure
  • (D) Quaternary structure

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Q. Hemoglobin is an example of which level of protein structure?

  • (A) Primary
  • (B) Secondary
  • (C) Tertiary
  • (D) Quaternary

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Q. Denaturation of proteins involves:

  • (A) Breaking of peptide bonds
  • (B) Loss of secondary and tertiary structure
  • (C) Formation of new amino acids
  • (D) Conversion to carbohydrates

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Q. Which of the following can cause protein denaturation?

  • (A) High temperature
  • (B) pH changes
  • (C) Heavy metals
  • (D) All of the above

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