THE SECONDARY STRUCTURE OF DNA AND CHARGAFF’S RULES
Watson-Crick Model The secondary structure of DNA, as proposed by James Watson and Francis Crick in 1953, is a double helix. This model consists of two polynucleotide chains that are coiled around the same axis. The backbone of the DNA…
RULES FOR FILLING ELECTRONS
In chemistry and physics, there are several rules and principles for filling in electrons in atoms and molecules. Here are some of the most important ones: 1) Aufbau principle: This principle states that electrons fill atomic orbitals in order of…
Study Guide
