First-degree burns affect the outer layer of skin, which is called the epidermis. They are moist, red in color and cause pain, redness and swelling. First-degree burns are partial-thickness burns because of their depth. They will heal spontaneously.
Nucleus. DNA can be found inside the nucleus of every cell, apart from red blood cells. It's tightly wound and spread throughout the 46 chromosomes. One set of 23 chromosomes is inherited from each parent. Inside the chromosomes the DNA exists as genes.
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).