Which of the following does not describe the role that can be ...

[geodog55]

Which of the following does not describe the role that can be played by an enzyme in a biological reaction?
   
  1.It changes the mechanism of the reaction.
  2.It lowers the energy of a transition state.
  3.It changes the free-energy of the reaction.
  4.It changes the rate of the reaction.
  5.It increases the specificity of the reaction.

Question 2

In a radical chain reaction, what would be the best description of the following reaction?
   H3C + Cl  CH3Cl

  1.propagation
  2.elimination
  3.initiation
  4.termination
  5.substitution

Question 3

What is the role of the alkene in the reaction above?
 
  1.electrophile
  2.nucleophile
  3.free radical
  4.catalyst
  5.Lewis acid

Question 4

Which of the following statements is incorrect?
  1.Polar reactions must have ionic intermediates.
  2.Initiation in radical-chain reactions must generate species with unpaired electrons.
  3.Polar reactions occur between electrophiles and nucleophiles.
  4.Lewis bases generally behave as nucleophiles.
  5.Electrophiles can be neutral as well as positively charged.

[joanwhite]

Answer to Question 1

3

Answer to Question 2

4

Answer to Question 3

2

Answer to Question 4

1