An amino acid molecule includes a central carbon atom bonded to a carboxyl group, and a hydrogen atom.

a nucleic acid and an r group
an amino group and an r group
an amino group and three fatty acids
an amino group and a nucleic acid

an amino group and an R group

"Each of the 20 amino acids has a central carbon atom with four covalent bonds. These bonds link the carbon atom to an amino group ( NH2 ), a carboxyl group ( COOH ), a hydrogen atom, and an R group. The R group can be a carbon side chain, a hydrogen atom, or a functional group. " from my textbook

hopes my answer can help you

An amino group and an R group

it is a good conductor

explanation:

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