A double-stranded base-paired structure formed by folding a single strand of DNA or RNA back upon itself like a hairpin. Base pairs are the unit of nitrogenous bases which are joined together by hydrogen bonds. They synthesize the double helix model which contribute the folded structure of both RNA and DNA. Sugar and phosphate is the backbone of DNA. DNA has fournitrogenous bases named adenine, thymine, guanine, and cytosine.
Fast food places have a lot of salt in their food because adding salt, which is a preservative, allows them to store the food supplies longer and save money.
When plants are allowed to self-fertilize generation after generation, the exact same physical traits appears without any change. Such plants are called pure line or true-breeding. For example, tall plants always produce tall plants and true-breeding dwarf plants always produce dwarf plants on selfing.
