#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?
#Question id: 62
#Biochemistry
We can represent atoms by listing the number of protons, neutrons, and electrons—for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?
#Question id: 63
#Biochemistry
The two molecules shown in the figures are best described as ________.
#Question id: 64
#Biochemistry
Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol ________.