Domains are independently folded tertiary structural elements of proteins, which often possess specific functions.

In primary structures of proteins, amide bonds are also known as peptide bonds.

Ramchandran plots are used to assess the possible conformations of secondary structural elements in peptides.

The C-N bond length of a peptide is longer than that found in methyl amine (CH3-NH2).

An increase in dissociation constant (Kd) implies a decrease in the binding affinity of a protein to its ligand.

The side chain of Lys (pKR =10.5) will be positively charged at pH:

Buffers work best when their pH values are equal to the pKa values of their weak acids.

Cation exchange resins contain positive charges.

All non-polar amino acids (with their pK1 and pK2 being 2.5 and 9.5, respectively) exist in “zwitterionic forms” at one of following pH values:

The microbes which inhabit extreme environmental conditions are known as: