Complex molecules constructed from long chains of amino acids polymerized together

lipids
proteins
carbs
nucleic acids

Proteins

Explanation:

Amino acid is a monomer. It is the building block of the polymer protein. Amino acids join to one another through peptide linkages to form a polypeptide. Polypeptides combine with each other in a 3D conformation to form proteins. There are 20 different amino acids in the cell. Amino acids have different side chains which make them acidic, basic, neutral, polar or non-polar.

answer; ///(u-235); ///is the correct

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3