Bug Bites that Cause Blisters. Bug bites that cause blisters may be painful and terribly itchy. They may also cause redness, swelling, and red bumps.Let us know how to manage this condition from the following article. Advertisement. With onset of rainy season, the intensity of insect infestation increases.ug Bites that Cause Blisters. Bug bites that cause blisters may be painful and terribly itchy. They may also cause redness, swelling, and red bumps.
heredity. the transmission of genetic traits from parents to offspring. The hereditary material is DNA in the ovum and sperm, so that the offspring's heredity is determined at the moment of conception. Inside the nucleus of each germ cell are structures called chromosomes.
Concept 19 The DNA molecule is shaped like a twisted ladder. Earlier work had shown that DNA is composed of building blocks called nucleotides consisting of a deoxyribose sugar, a phosphate group, and one of four nitrogen bases â adenine (A), thymine (T), guanine (G), and cytosine (C).Phosphates and sugars of adjacent nucleotides link to form a long polymer.Other key experiments showed that the ratios of A-to-T and G-to-C are constant in all living things. X-ray crystallography provided the final clue that the DNA molecule is a double helix, shaped like a twisted ladder.n 1953, the race to determine how these pieces fit together in a three-dimensional structure was won by James Watson and Francis Crick at the Cavendish Laboratory in Cambridge, England. They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder.