1- Km

a- increases when the affinity of an enzyme increases

b- increases when the affinity of an enzyme decreases

c- increases when the velocity increases

d- has a unit in Molar

e- has a unit in product per second

f- c and e

g- c and d

h- b and e

i- b and d

j- I dont know

 

 

2-Which is true?

a- All enzymes are soluble proteins

b- Heat is enough to disrupt the Alpha Helix structure of an enzyme such as

   chymotrypsin

c- D-Amino Acids can never be found in a protein

d- Beta pleated sheat is more stable than alpha helix because it consists of

    more H bonds

e- NAD is part of an enzyme that can catalyses a transfer of electrons

f- None of the above

 

 

3-which is true

a- Thiamine is the coenzyme needed for a decarboxylase

b- Hexokinase is a Lyase

c- Temperature can cause the reaction go faster by lowering the Energy of

    activation

d- Papain enzyme can keep the same activity over a certain range of pH

e- in a competitive inhibition, increasing the concentration of the substrate

    will not  affect the velocity of  the reaction.

 

 

4-Km:

a- is the concentration of S that we need to reach Vmax

b- is the concentration of S/2  that we need to reach Vmax

c- is the concentration of S that we need to reach Vmax/2

d- is V/2

e- is the velocity at the concentration of S/2

f- why do I care

g- because it is going to be on either the unified or the midterm

 

5-A competitive inhibitor

a- doesn't affect Km

b- increases Km

c- Decreases Km

d- can be overcome by increasing the substrate concentration

e- b and d

f- c and d

g- a and d

h- Michael is a pain

 

 

6-in a Lineweaver Burk equation

a- the fastest reaction is the one with the biggest slope (I dont think so)

b- the fastest reaction is the one with the highest 1/Km (are u sure?)

c- the fastest reaction is the one with lowest 1/Vmax (may be yes may be not)

d- The fastest reaction is the one with the lowest slope (Aha...)

e- b and d (that's a tricky one)

f- c and d (That's a tricky one too)

g- a and b (think hard)

h- none of the above

 

 

 

Prepared by Michael Nawfal