Are a category of sugars that contain either one or two molecules.

These are simple carbohydrates. This are molecules that can be broken down easily by the body to be used as source of energy. This is usually found in foods such as fruits, milk and milk products. This can also be categorized as single sugars or monosccharides, double sugars or disaccharides which includes sucrose, lactose and maltose. This must be differentiated from complex sugars which are normally polysaccharides. These are starches that form longer saccharide chains.

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.