Question

1. Hibernating bears are likely to keep warm through the winter through the use of which of the following?
Select one:
a. a special form of ATP synthase that generates heat as well as ATP
b. special teddy bear pyjamas
c. Metabolising a special form of glucose
d. hot water bottles
e. uncoupling proteins

2. A series of enzymes catalyze the reactions in the metabolic pathway X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. With respect to the enzyme that converts X to Y, substance A functions as which of the following?

Select one:
a. an allosteric inhibitor
b. a competitive inhibitor
c. the substrate
d. an enzyme
e. an intermediate

3. What is the name of the thermodynamic barrier that must be overcome before products are formed in a spontaneous reaction?
Select one:
a. activation energy
b. free energy
c. entropy
d. the equilibrium point
e. deactivation energy

Answer 1

1. option E --uncoupling protein --UCP 1 is as heat generator in adipose tissue helps to keep warm temp in body during winter in heibernating animals.

2. option a -- an allosteric inhibition -- the above example is best to discribe feedback inhibition - where it limits the product concentration if it is already in enough concentration by inhibiting the ezyme of the same pathway where it produced.

3. option a -- activation energy -- spontaneous reaction will not happen usually becz of activation energy barrier, this will occur only after providing energy from outside ,so that spontneous reactions will occur..