#Question id: 56
#Biochemistry
Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?
#Question id: 57
#Biochemistry
A(n) ________ has charge but negligible mass, whereas a(n) ________ has mass but no charge.
#Question id: 58
#Biochemistry
A covalent chemical bond is one in which ________.
#Question id: 59
#Biochemistry
Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?
#Question id: 60
#Biochemistry
Which of the following is true for the reaction?
3H2 + N2 
2NH3
#Question id: 61
#Biochemistry
Which of the following correctly describes chemical equilibrium?