Flail chest: A condition that occurs when enough ribs are broken (usually from a crush injury) to compromise the rigidity of the chest wall.On inspiration, the chest wall moves inward instead of outward, and it does the opposite on expiration.lail chest: A condition that occurs when enough ribs are broken (usually from a crush injury) to compromise the rigidity of the chest wall.
The simple summary is that DNA makes RNA, and then RNA makes proteins. DNA, RNA and proteins all consist of a repeating structure of related building blocks (nucleotides in the case of DNA and RNA, amino acids in the case of proteins). In general, they are all unbranched polymers, and so can be represented in the form of a string.
Like DNA, RNA is composed of its phosphate group, five-carbon sugar (the less stable ribose), and four nitrogen-containing nucleobases: adenine, uracil (not thymine), guanine, and cytosine. Base Pairing. Adenine links to thymine (A-T) and cytosine links to guanine (C-G). Messenger RNA (mRNA) transcribes genetic information from the DNA found in a cell 's nucleus, and then carries this information to the cell's cytoplasm and ribosome. 2  Transfer RNA (tRNA) is found in a cell's cytoplasm and is closely related to mRNA as its helper.