With the exception of particular cells (as an example, semen and egg cells and blood that is red), the cell nucleus contains 23 pairs of chromosomes. A chromosome contains numerous genes. A gene is just a portion of DNA providing you with the rule to make a protein.
The DNA molecule is an extended, coiled double helix that resembles a staircase that is spiral. With it, two strands, consists of sugar (deoxyribose) and phosphate particles, are linked by pairs of four particles called bases, which form the actions associated with the staircase. Adenine is paired with thymine and guanine is paired with cytosine in the steps. Each couple of bases is held together with a hydrogen relationship. A gene comprises of a series of bases. Sequences of three bases rule for the acid that is amino acids will be the foundations of proteins) or other information.
A couple of normal chromosomes from a male. The intercourse chromosomes (final set) are designated XY.
Image thanks to the Centers for infection Control and Prevention Public wellness Image Library and Suzanne Trusler, MPH, DrPH. 阅读更多