3A_Biomolecules+250310


 * __HOMEOSTASIS!__**

Involves cells. Partially permeable membrane -> cell membrane Substances moving through a partially permeable membrane to go in and out of the cell.

Water potential.

DEFINE homeostasis. my definition: Homeostasis is the process in which living cells try reach equilibrium.

Homeostasis maintains equilibrium in a system.

In order to understand this equilibrium, you need to understand CELLS and the PARTIALLY PERMEABLE MEMBRANE.


 * __MATTER, ENERGY AND ORGANISATION__**
 * **Energy** is stored in the organization of matter
 * Living organisms use matter and energy to build and maintain body structures
 * Living organisms obtain and process matter and energy
 * The structure of a molecule always dictates its function.
 * The structure and function of biological living systems obeys the laws of thermodynamics.
 * Communities of organisms depend on the cycling of matter and the flow of energy
 * The constant flow of energy and cycling of matter in the biosphere leads to a balanced or steady state.

//This balance is achieved through various biogeochemical cycles and the processes of photosynthesis and cellular respiration - focus is on ENERGY.//

__Pick one statement and support with evidence.__ - Structure of a molecule are highly specialized to best fit the process in which they are designed for. For example, the small intestine has large folds and small wavy things coming out from it so as to have the largest possible surface area so that food can be easily absorbed.
 * The structure of a molecule always dictates its function.


 * Carbon and water will cycle through a system but energy will only flow with the system.

Thermodynamics: energy cannot be created or destroyed. The carbon molecule has 4 free valence electrons that allows it to bond with 4 atoms. Able to single or double bond. It can even bond with itself and form a huge chain- a backbone. Allows molecules to be as strong as possible.
 * Why is the carbon molecule suitable for life as we know it?
 * Why is the chemistry of water suitable for life?