Biology
Grade-7
Easy

Question

Chemical reactions are connected in _____.

  1. Chains 
  2. Cells 
  3. Road 
  4. None of these 

hintHint:

A chemical reaction involves the metabolism of a chemical molecule or a compound

The correct answer is: Chains


    • A chemical reaction involves the metabolism of a chemical molecule or a compound
    • The result of a chemical reaction can produce energy or produce a new molecule
    • The reactions that occur inside a cell are a chain or sequence of reactions
    • For example, glycolysis is a catabolic reaction that does not occur in a single step
    • Initially, a glucose molecule is converted into glucose-6-phosphate, which undergoes a further sequence of reactions to produce the pyruvate and ATP
    • The pyruvate formed is not the ultimate product but enters the Krebs cycle and further processes follow
    • Hence, a chemical reaction is a chain of reactions

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