Which type of chemical bond holds water molecules together by forming a bridge between the negative oxygen atom of one water molecule and the positive hydrogen atoms of another water molecule?
a. isotopic
b. hydrogen
c. ionic
d. covalent
Question 2
The ____ structure of proteins is determined by the hydrogen bonds between amino acids that cause the protein to coil into helices or pleated sheets.
a. secondary
b. tertiary
c. primary
d. quaternary