perhaps more specificity is needed. The favourite molecule of the brain I would say is glucose as it can only eat glucose and therefore craves it. However you may be asking about neurotransmitters which is not an area I am familiar with. Glucose is a Carbohydrate, more specificially it is a monosaccharide. It is also an aldohexose (6 carbon molecule with an aldehyde group).
proteins !
carbohydrate
it adds a phosphate group Phosphorylation is the addition of a phosphate (PO43−) group to a protein or other organic molecule.
A nucleic acid always contains sugar molecules, phosphate groups, and nitrogen bases. A single nucleotide contains one sugar molecule, one phosphate group, and one nitrogen base. A DNA nucleotide contains one deoxyribose sugar molecule, one phosphate group, and one nitrogen base, which could be any of the following: adenine, thymine, guanine, or cytosine. An RNA nucleotide contains one ribose sugar molecule, one phosphate group, and one nitrogen base, which could be any of the following: adenine, uracil, guanine, or cytosine.
Nitrogenous base, phosphate group, and RNA.
proteins !
carbohydrate
Phospholipid molecule is actually almost similar to a lipid molecule. It is a alcohol connected to 2 fatty acids and a phosphate group.(In lipids, its connected to 3 fatty acids)
it adds a phosphate group Phosphorylation is the addition of a phosphate (PO43−) group to a protein or other organic molecule.
A DNA nucleotide contains a deoxyribose sugar molecule, a phosphate group, and a nitrogen base.
A DNA nucleotide contains a deoxyribose sugar molecule, a phosphate group, and a nitrogen base.
The -one suffix denotes this molecule - that contains a chlorine atom, an acetyl group, and some derivative of a phenyl group - as a hormone.
A nucleic acid always contains sugar molecules, phosphate groups, and nitrogen bases. A single nucleotide contains one sugar molecule, one phosphate group, and one nitrogen base. A DNA nucleotide contains one deoxyribose sugar molecule, one phosphate group, and one nitrogen base, which could be any of the following: adenine, thymine, guanine, or cytosine. An RNA nucleotide contains one ribose sugar molecule, one phosphate group, and one nitrogen base, which could be any of the following: adenine, uracil, guanine, or cytosine.
an amino acid
Nitrogenous base, phosphate group, and RNA.
The plasma membrane is made up of phospholipids, each of which contains a glycerol molecule bonded to a phosphate group and two fatty acids.
Quite a few fit that description (including water, carbon dioxide, borane etc.)