What is the cause of secondary structure in a protein? A) ...

[khang]

What is the cause of secondary structure in a protein?
 
  A) short range interactions between neighboring amino acids
  B) covalent bonding between different protein molecules
  C) noncovalent interaction of groups of protein molecules
  D) long distance conformation changes due to a large number of weak interactions
  E) none of the above

Question 2

In one type of fuel cell, the following oxidation-reduction reactions are taking place:
 
  2 H2 + O2  2 H2O
 
  What is the oxidant?
  A) H2
  B) O2
  C) H2O
  D) all of the above
  E) none of the above

Question 3

Light nuclei can be split. For example, a deuteron, which is a proton-neutron combination, can split into a separate proton and separate neutron. Does such a process yield energy or cost energy? Why?
 
  A) Yields energy. Splitting nuclei of any sort is a basic example of a nuclear reaction releasing massive amounts of energy.
  B) Neither. The amount of energy required to split the light nuclei is exactly the same as that released. This is the basis of the Law of Conservation of Energy.
  C) Costs energy. This fact is consistent with the sum of the masses of the separated proton and neutron being greater than the mass of the original deuteron.
  D) Yields energy. This fact is consistent with the sum of the masses of the separated proton and neutron being less than the mass of the original deuteron.

[whitcassie]

Answer to Question 1

A

Answer to Question 2

B

Answer to Question 3

C