record player(Noun) An analogue electronic device for playing gramophone records. record player. A type of musical device and product created and designed in various colors, materials, mechanisms, needle, arm, shapes, sizes and styles used to play a variety of records on.
Almost everybody who talks about DNA can tell you it is double stranded. And that it forms a twisted ladder or a double helix. But few people can tell us why. DNA is a spiral for a number of reasons that have to do with what it is made of. Let's dig deeper, break open the DNA and figure out why it is put together in that shape.
DNA is the heredity material of the cell. Some cells (bacterial cells) have one large circular DNA strand. In other organisms like us (aka eukaryotic cells) the dna for the cell is in several linear strands instead of one large circular piece of DNA. Each one of these strands of DNA is called a chromosome. The DNA of each chromosome is really tightly wound up around proteins called histones. Finally, a gene is a small segment of DNA, found in a small section of the chromosome (These can often be seen as dark bands in pictures of chromosomes). It is here, at the gene, that the DNA uncoils and opens up momentarily in order to have the gene 'read' and eventually copied into a protein (aka polypeptide).