Study

4.3 Chemical Reactions – Biology A

  •   0%
  •  0     0     0

      Back   Restart
  • What are reactions that absorb energy called?
    Physical reactions
    Exothermic reactions
    Enzymatic reactions
    Endothermic reactions
  • What are enzymes?
    Biological catalysts that speed up reactions
    Acids found in the stomach
    Energy sources in cells
    Chemicals that slow down reactions
  • What are reactions that release energy called?
    Endothermic reactions
    Exothermic reactions
    Mechanical reactions
    Enzymatic reactions
  • Why are enzymes vital for life?
    They help reactions occur fast enough to sustain life
    They cool the body
    They make cells bigger
    They remove carbon dioxide
  • What are exothermic reactions in organisms called?
    Endothermic reactions
    Metabolic reactions
    Catabolic reactions
    Anabolic reactions
  • Which law states that matter cannot be created or destroyed?
    Newton’s Law of Motion
    Law of Conservation of Matter
    Theory of Relativity
    Law of Thermodynamics
  • What is activation energy?
    Energy stored in bonds
    Energy released after a reaction
    Energy needed to start a reaction
    Total energy in products
  • What is the “lock and key” model?
    Energy stored in bonds
    Enzyme fits specific molecules to catalyze a reaction
    Enzyme shape has no importance
    Enzymes work for all molecules
  • What enzyme breaks maltose into glucose?
    Lipase
    Maltase
    Pepsin
    Amylase
  • What affects enzyme activity?
    Temperature and pH
    Size and color
    Light and sound
    Gravity and speed
  • What are endothermic reactions in organisms called?
    Anabolic reactions
    Exothermic reactions
    Catabolic reactions
    Neutral reactions
  • What happens if enzymes lose their shape?
    They change into products
    They become denatured and stop working
    They make new enzymes
    They speed up more reactions
  • What are substances formed in a chemical reaction called?
    Mixtures
    Reactants
    Compounds
    Products
  • What is the general equation for an endothermic reaction?
    Energy → Reactants + Products
    Reactants + Energy → Products
    Products → Reactants + Energy
    Reactants → Products + Energy
  • Which type of change forms a new substance?
    Mixture
    Chemical change
    Physical change
    Phase change
  • How do enzymes speed up reactions?
    They add more reactants
    They lower activation energy
    They remove products
    They increase temperature
  • What is the general equation for an exothermic reaction?
    Energy → Products + Reactants
    Products → Reactants + Energy
    Reactants → Products + Energy
    Reactants + Energy → Products
  • What do enzymes do in digestion?
    Break down food molecules into smaller units
    Store oxygen
    Make new DNA strands
    Absorb light energy
  • What is a biochemical reaction?
    A chemical reaction inside living cells
    A physical reaction outside cells
    A mixture of compounds
    A nuclear reaction
  • Where do biochemical reactions occur?
    In gases
    In rocks
    Outside cells
    Inside cells
  • What are substances that start a chemical reaction called?
    Reactants
    Products
    Elements
    Compounds
  • What does a balanced chemical equation show?
    Atoms disappear
    Mass is conserved
    Energy is lost
    New elements are made
  • What enzyme breaks starch into maltose?
    Amylase
    Cellulase
    Protease
    Lipase
  • What happens during a chemical reaction?
    Energy is destroyed
    Atoms are rearranged to form new substances
    Atoms disappear
    Only physical changes occur
  • What is metabolism?
    Sum of all biochemical reactions in an organism
    Only digestion reactions
    Only endothermic reactions
    Movement of energy through space
    • Your experience on this site will be improved by allowing cookies.