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.
Proteins constitute over 80% of the total mass of nuclear material, while DNA forms 15 to 20%. There are 5 histone proteins associated with DNA Two molecules each of histones H2A, H2B, H3 and H4 form a histone core. DNA is wound around the histone cores-two turns of DNA around each. core form a nucleosome.