<span>The primary excitatory neurotransmitter in the brain and spinal cord is Glutamate. Glutamate is an amino acid that is responsible for binding receptors in the central nervous system and is found at almost all synapses. It helps transmit signals across the synapses.</span>
Answer:
Gel electrophoresis
Explanation:
PCR, that is, polymerase chain reactions amplifies the small amount of sample DNA into the multiple copies. These DNA fragments are then subjected to gel electrophoresis, a technique that uses the electric field and separates the DNA fragments based on their size. These separated DNA fragments are then visualized using autoradiography.
I think that the best word to fill into the gap is "solid".
Solid comes in opposition to other fundamental states of matter: liquid, gas, plasma (the last one can be characterized by high electric conductance).
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