Truly modern molecular biology emerged with the uncovering of the structure of DNA in the 1960s and concurrent advances in biochemistry and genetics. Molecular biology is one of three primary molecular-scale biological sciences, the others being biochemistry and genetics.
1 Students should know the parts and functions of the circulatory and respiratory systems and how they work together for respiration. 2  Students should also understand what homeostasis is and that all living things must be able to maintain homeostasis.
HOW BREATHING WORKS. GAS EXCHANGE. FIND OUT MORE. The main organs of the respiratory system are the lungsâtwo large organs that expand and contract. Each has a network of airways that end in tiny pockets called alveoli, where oxygen enters the blood and carbon dioxide leavesâa process known as Gas exchange.