Wednesday Daily Questions

Today's Daily Questions were all sample Keystone Exam questions and will most definietly show up on your test on friday.

Which statement BEST explains why large changes in pH can affect the functions of plant enzymes? A. Large changes in pH increase the rate of biochemical reactions B. Large changes in pH provide the energy necessary to activate an enzyme C. Large changes in pH can denature an enzyme causing a change in its shape D.  Large changes in pH can cause an enzyme to lower the activation energy
Without enzymes, the chemical reactions in our body woul		a. Happen too quickly                                 C.  require a different pH b.Occur at the same rate as they do now   D.Occur too slowly to support life processes
An enzyme	a. Provides extra energy for a reaction              c. Eliminates the activation energy of a reaction b. Lowers the activation energy of a reaction    d. allows irreversible reactions to occur
Which of the following statements about enzymes is FALSE?		a. are usually proteins                 c. reduces the activation energy of chemical reactions b. can only catalyze a reaction once     d. are greatly affected by pH and temperature
Substance A is converted to substance B in a metabolic reaction.  Which statement BEST describes the role of an enzye during this reaction?			A.  It adjusts the pH of the reaction medium B.  It provides energy to carry out the reaction C.  It dissolves substance A in the reaction medium D.  It speeds up the reaction without being consumed

Today we went through these, then talked through the lab from yesterday and the directed reading activity.  You were to turn in the "Quiz" part of that packet.  Tomorrow we will review and Friday will be the test!!!