n 1952, Rosalind Franklin produced an image of DNA that suggested it contained two strands twisted in a double helix with a phosphate backbone and bases inside.Franklin calculated the diameter of DNA, the distance between strands and bases, the angle of the helix, and the number of bases per coil.Watson and Crick used this information to build and accurate model of DNA.
Short hair-like projections, many bacteria and unicellular eukaryotes make use of cilia for locomotion. Humans also make use of cilia - they are found in the respiratory system and are used to carry mucus.
If a patient develops a myocardian infraction that disables the sinoartial node, the heart would still pump blood to the aorta and the pulmonary trunk regardless, because the atrioventricular node will still stimulate the ventricular systole.
