The following statement describes what level of structure in a ...

[james0929]

The following statement describes what level of structure in a protein? Several separate proteins link together to form an active enzyme.
 
  A) primary structure
  B) secondary structure
  C) tertiary structure
  D) quaternary structure
  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 fuel ?
  A) H2
  B) O2
  C) H2O
  D) all of the above
  E) none of the above

Question 3

Why do soils that contain a high percentage of clay retain plant nutrients so well?
 
  A) The ions of clay tend to be positively charged while nutrients tend to be negatively charged.
  B) Water cannot penetrate through clay very well, which means that nutrients are not readily washed away.
  C) Clay contains many magnetic particles, which have the effect of holding onto the nutrients.
  D) Because of a lack of water, the nutrients are not dissolved, which means they adhere as a solid to the clay particles.

[Cnarkel]

Answer to Question 1

D

Answer to Question 2

A

Answer to Question 3

B

[james0929]

Excellent

[kjohnson]

Wow, this really help