Which of the following statement is/are incorrect? a) acetylcholine may be excitatory or inhibitory depending upon the type of receptor it binds to. b) glutamate and aspartate have excitatory effects. c) gamma amino butyric acid and glycine are excitatory neurotransmitters. d) atp is an excitatory neurotransmitter. e) biogenic amines may be excitatory or inhibitory depending upon the type of metabotropic receptor that they bind to.

The answer is C- Gamma amino butyric acid and glycine are excitatory neurotransmitters.

Explanation:

This is because Gamma amino butyric acid (GABA) and glycine are known to be inhibitory neurotransmitters in the central nervous system. They are both amino acids, they act as inhibitory neurotransmitters by blocking nerve impulses. Inhibitory neurotransmitters are known to decrease neuron's action potential.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.