[Solved] Which is true about prions? A) They cause a degenerative brain condition. B) They are naked pieces of RNA. C) They are made of DNA and protein. D) They are a normal brain protein that has folded differently. E) They cause a degenerative brain condition AND they are a normal brain protein that has folded differently. Ganglion Cells: Neurons whose axons form the optic nerve. Axon Terminals: The endpoints of axons where neurotransmitters are released to communicate with neighboring neurons or muscle cells. Dendrites: Root-like structures, attached to the cell body of a neuron, that receive impulses, or incoming messages, from other neurons. Acetylcholine: A neurotransmitter in both the central and peripheral nervous systems that plays a critical role in the activation of muscle action, learning, and memory.