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This set of study notes covers the topic of organisms exchanging substances with their environment in A-Level Biology, with a focus on surface area to volume ratio, gas exchange, digestion and absorption, mass transport in animals and plants, and the importance of exchange in homeostasis. The notes provide an overview of the fundamental principles and mechanisms involved in exchange processes, and emphasize the importance of these processes in maintaining the delicate balance of life. By underst...

This set of study notes covers the topic of biological molecules in A-Level Biology, with a focus on the four main types of biological molecules: carbohydrates, lipids, proteins, and nucleic acids. The notes explore the properties and functions of each type of molecule, as well as the important roles they play in life processes such as energy storage, enzyme catalysis, and information transfer. Additionally, the notes provide an overview of enzymes, including their properties, mechanism of catal...