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Elements of life Knowledge-Based Practice

Biology · Chemistry of Life · Biology · Atoms, Water & Chemical Bonds

5 Biology practice questions on Elements of life. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which chemical element accounts for the largest percentage of human body mass?

    • A) Carbon
    • B) Oxygen
    • C) Hydrogen
    • D) Nitrogen
  2. 2.

    Which chemical element is an essential component of the amino acids cysteine and methionine, playing a critical role in stabilizing tertiary protein structures through the formation of covalent cross-links?

    • A) Phosphorus
    • B) Sulfur
    • C) Magnesium
    • D) Calcium
  3. 3.

    Which chemical element forms an essential component of nucleic acids, ATP, and membrane phospholipids, representing a major constituent of the remaining 4% of living biomass beyond carbon, hydrogen, oxygen, and nitrogen?

    • A) Sulfur
    • B) Calcium
    • C) Phosphorus
    • D) Magnesium
  4. 4.

    Which of the following statements correctly describes trace elements in living organisms?

    • A) They are indispensable for survival but are required only in minute quantities.
    • B) They are nonessential elements that accumulate in tissues without serving biological functions.
    • C) They are abundant elements that make up the structural backbone of carbohydrates and lipids.
    • D) They are required exclusively by autotrophic plants and play no role in animal physiology.
  5. 5.

    Which four chemical elements constitute approximately 96% of the mass of living matter?

    • A) Carbon, hydrogen, iron, and calcium
    • B) Carbon, hydrogen, oxygen, and nitrogen
    • C) Nitrogen, phosphorus, sulfur, and potassium
    • D) Oxygen, calcium, phosphorus, and sodium

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