3.3

Question 1

Enzymes

Answer 1

• Help lower Ea (use less energy)
• Help speed of reactions without being consumed in the reaction itself
• without enzymes, metabolism process would be really slow

Question 2

Enzymes as Catalyst

Answer 2

• Almost always proteins
• Act as catalysts
• Lowers activation energy, allows reactants to reach transition state more quickly
• allows products to form quickly
• Does not alter physical component of reactant

Question 3

Name of enzymes

Answer 3

• always written above arrow sign of a chem. equation

Question 4

Activation energy as barrier to chemical reactions

Answer 4

Activation Energy:

• energy required to start a reaction
• Energy need to break the bonds

Transition state:

• temporary state before new bonds are formed, and bonds are at breaking point
• Reaction will not take place until it reaches Ea

Question 5

What provides Ea

Answer 5

1. Thermal energy
   Ex. lightning hitting a tree to start a fire
   - Can destroy structural composition of protein

• hard to regulate

2. Enzymes

• Allows reactions to occur using less energy
  -Can be regulated to control rates of reaction

Question 6

Lowing Ea with enzymes

Answer 6

• Amount of free energy of the reaction is unaffected
• Has no effect on products/reactants

Question 7

How do enzymes lower Ea

Answer 7

1. Charged enzymes help break bond
2. Help from reactants together
3. Enzymes changes shape of substrate