Neuroscience is the study of the nervous system, which includes the brain and the spinal cord. It's a broad term encompassing numerous, more specific disciplines, including cognitive, clinical, and developmental neuroscience.
DNA (deoxyribonucleic acid) is an extremely important molecule for life on Earth. All known living organisms use genetic information in their cell growth and development, division, and function – and DNA is responsible for encoding that information. Structurally, DNA is a double helix (much like a spiral staircase), and each step in the chain is part of a long code that conveys genetic information.