degeneration. deterioration; change from a higher to a lower form, especially change of tissue to a lower or less functionally active form. When there is chemical change of the tissue itself it is true degeneration; when the change consists in the deposit of abnormal matter in the tissues, it is infiltration.apetoretinal degeneration degeneration of the pigmented layer of the retina. transneuronal degeneration atrophy of certain neurons after interruption of afferent axons or death of other neurons to which they send their efferent output.
There are four different DNA nucleotides, each defined by a specific nitrogenous base: adenine (often abbreviated A in science writing), thymine (abbreviated T), guanine (abbreviated G), and cytosine (abbreviated C) (Figure 2).
There are five chief types of components in nucleic acids: cytosine, guanine, thymine, uracil, and adenine. Whether the acid contains uracil or thymine determines whether it is DNA (thymine) or RNA (uracil).Examples of Nucleic Acids: 1. DNA. Deoxyribonucleic acid, also known as DNA, is a well-known component in genetics.It contains all of the genetic information for a living organism, carried as long strings of information called genes. These genes are found in the nucleus of the cells.A polymer structure made of sugar provides the attachment point for the nucleobases that make up the DNA. The combinations of where these nucleobases attach forms our hereditary traits. 2.hese genes are found in the nucleus of the cells. A polymer structure made of sugar provides the attachment point for the nucleobases that make up the DNA. The combinations of where these nucleobases attach forms our hereditary traits. 2.